you perform an experiment to determine how many breaths a fish takes per minute. your experiment yields the following data: minute 1:65 breaths; minute 2:73 breaths; minute 3:67 breaths; minute 4:71 breaths; minute 5:62 breaths. calculate the average number of breaths that a fish takes per minute.

The researcher is not conducting non-random sampling.

Random sampling is a sampling technique in which every individual or element of the population of interest has an equal opportunity of being selected for the sample. Each member of the population has an equal chance of being selected for the sample. Random sampling helps to ensure that the sample is representative of the population.

Non-random sampling, on the other hand, is a sampling technique in which the individuals or elements of the population of interest are not randomly selected. In other words, not every member of the population has an equal chance of being selected. This sampling method is biased and can lead to an unrepresentative sample.

The researcher is not conducting a non-random sampling technique because she is observing every child in the population of interest. The population of interest, in this case, is the children on the playground.

The researcher is not conducting non-random sampling because random sampling is a sampling technique in which every individual or element of the population of interest has an equal opportunity of being selected for the sample.

To know more about "non-random sampling": https://brainly.com/question/24466382

#SPJ11

The winner of the treasure hunt calculates the resultant displacement by using vector addition. They add the three given displacements together to determine the net displacement needed to find the buried keys to the Porsche. This involves both magnitude and direction calculations.

In the first contest, the winner calculates the magnitude of the resultant displacement by adding the magnitudes of the three given displacements: 72.4 m, 57.3 m, and 17.8 m. The sum of these magnitudes gives the total distance that needs to be covered to reach the buried keys.

In the second contest, the winner calculates the direction of the resultant displacement by considering the angles associated with each given displacement. They take into account the directions mentioned, such as east, north, south, and west. By using trigonometric principles and vector addition, the winner determines the overall direction in which they should proceed to locate the buried keys.

By calculating both the magnitude and direction of the resultant displacement, the winner maximizes their chances of reaching the treasure efficiently and accurately.

Learn more about vectors here: brainly.com/question/24256726

#SPJ11

Answer:

we know that distance = speed *time

hence d= t*s

=2*0.72{ no need to convert into second and meter because both are given in km and hr}

=1.44 m

Answer:

Mean 140 grams

Standard deviation 22.4 grams

Step-by-step explanation:

What would the mean and standard deviation of these apples' weights be as determined by this scale? (Note: 1 ounce ≈ 28 grams).

Mean = 5.2 ounces.

First step would be to convert from ounces to grams

1 ounce = 28 grams

5.2 ounces =

5.2 ounces × 28 grams

= 145.6 grams

He underweighs by 0.2 ounces

We convert this too

1 ounce = 28 grams

0.2 ounce =

0.2 ounce × 28 grams

= 5.6 grams.

The new mean weight of the Fuji apples is grams = 145.6 grams - 5.6 grams = 140 grams.

Standard Deviation = 0.8 ounces.

Even though he underweighed that apples by 0.2 ounces, there has minimal effect on the standard deviation of the apples.

Hence, the standard deviation if the apples in grams =

1 ounce = 28 grams

0.8 ounce =

0.8 ounce × 28 grams

= 22.4 grams

Answer:

Yes it is

Step-by-step explanation:

In order to find it, you just need to find the slope which the equation is y2-y1/x2-x1

Giving you the slope to be -5/3

and the b value is 16 bc it is 16 at 0

slope equation is y= mx + b

plug -5/3X+16 into your graphing calculator and see that it is a straight line and boom.

Answer:

In cooking (recipes).

Step-by-step explanation:

If the serving size for a recipe is not adequate for the number of people you are serving, you will have to convert the amounts(measurements) of the ingredients to suit your needs. You will do this by first creating a ratio defining the relationship between the serving size of the given recipe to the number of people needed to be served. For example, if a recipe serves 4 people, and you need to serve 8, your ratio would simplify to 1/2. This means you must proportionally relate this ratio to the individual amounts of each ingredient.

Answer: take a picture of the work please

Step-by-step explanation:

Answer:

20 people

Step-by-step explanation:

well we know that only going to the restaurant every person must pay $7

so we have only $3 extra

those 3 dollars times the number of people must give 60 dollars

\(3x=60\\\\\frac{1}{3} *3x=\frac{1}{3} *60\\\\x=20\)

so 20 people must go, to pay only $10

Option a is correct.

What is dimension analysis?

Dimensional analysis is the analysis of the relationships between different physical quantities by identifying their base quantities and units of measure and tracking these dimensions as calculations or comparisons are performed.

We can convert qt/min to gal/h as shown below:

1 qt = 0.25 gallon

1 min = 1/60 hour

4.5 qt/min = (4.5*0.25)/ (1/60) gal/h

= 4.5*0.25*60 gal/h

= 67.5 gal/h

Hence option a is correct.

Learn more about Conversion here:

https://brainly.com/question/2551466

#SPJ4

The expected value of the gain or loss from rolling the die is -$0.67 (option D). We multiply each possible outcome by its probability and sum them up.

There are two favorable outcomes (rolling a 1 or a 3) with a probability of 2/6 each (since there are six equally likely outcomes when rolling a fair die). The gain for each favorable outcome is $4. However, for the remaining four outcomes (rolling a 2, 4, 5, or 6), there is no gain and the loss is $2.

Using these values, we can calculate the expected value:

Expected value = (probability of favorable outcomes * gain per favorable outcome) + (probability of unfavorable outcomes * loss per unfavorable outcome)

Expected value = (2/6 * $4) + (4/6 * -$2) = $8/6 - $8/6 = -$0.67

Therefore, the expected value of the gain or loss from rolling the die is -$0.67, indicating a net loss on average.

Learn more about probability here:

https://brainly.com/question/32117953

#SPJ11

The machine will be profitable to use for 8 years

We have the information available from the question is:

The rate of annual savings​ (in dollars) given by the function S'(x)​, where x is the number of years of operation of the​ machine, while producing a rate of annual costs​ (in dollars) given by the function C'(x).

S'(x) = 142 - x²

C'(x) = x² + (7/4) x

The rate of annual savings​ (in dollars) given by the function S'(x)​ equal to or greater than the rate of annual costs​ (in dollars) given by the function C'(x).

S'(x) = C'(x)

142 - x² = x² + (7/4) x

0 = x² + x² + (7/4) x - 142

0 = 2x² + (7/4)x - 142

2x² + (7/4)x - 142 = 0

Multiplying by 4;

4(2x² + (7/4)x - 142) = 4(0)

8x² + 7x - 568 = 0

Solving the quadratic equation, we have;

x = -8.875 or x = 8

Therefore, x which is the number of years cannot be negative.

x = 8 years

Learn more about quadratic equation at:

https://brainly.com/question/30098550

#SPJ4

Complete question is:

Suppose a company wants to introduce a new machine that will produce a rate of annual savings​ (in dollars) given by the function S'(x)​, where x is the number of years of operation of the​ machine, while producing a rate of annual costs​ (in dollars) given by the function C'(x).

S'(x) = 142 - x², C'(x) = x² + (7/4) x

For how many years will it be profitable to use this new​ machine?

A binomial is a difference of squares if both terms are perfect squares. Remember that we might first need to filter out a common element.

Perfect squares result from squaring an integer. One such example is the number 81, which is a perfect square since it can be derived by squaring 9: 99=81. 144 is a perfect square since it can be generated by squaring the number 12, which results in 12. 169 is a perfect square since it can be squared to produce the number 13. mathematics-specific language Informally: When an integer (a "whole") number, whether positive, negative, or zero, is multiplied by itself, the result is referred to as a square number, a perfect square, or simply "a square". Accordingly, all square numbers are 0, 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, and so on.

given

A binomial is a difference of squares if both terms are perfect squares. Remember that we might first need to filter out a common element.

If a binomial is found to be a difference of squares, it is factored into two binomials. the first being the first term's square root less the second term's square root.

To know more about perfect square visit :-

brainly.com/question/385286

#SPJ4

Answer:

5.1

Step-by-step explanation:

all you do is divide 12.55 by 2.54

Answer:

5 inches.

Step-by-step explanation:

If each inch is 2.54, you basically have to divide 12.55 divided by 2.54. Which would equal 4.94094488189. That would round to 5, which means approximately, it equals 5 inches.

Sorry if this is incorrect, but I do believe it is correct, have a good day!

Answer:

A

Step-by-step explanation:

Answer:

divide by -2/3 you will get -51

i believe :)

Step-by-step explanation:

The median price of all the lawn mowers for sale is $175.

If the two stores have the same number of lawn mowers for sale, then the median price of all the lawn mowers can be found by taking the average of the two median prices, which is:

median price = (150 + 200) / 2 = 175

Therefore, the median price of all the lawn mowers for sale is $175.

However, it is important to note that the median price may not give us a complete picture of the prices of all the lawn mowers at each store. For example, one store could have a wide range of prices for its lawn mowers, with a few very expensive models bringing up the median price, while the other store could have a more consistent range of prices with fewer outliers. Therefore, it would be best to also look at other measures of central tendency, such as the mean or mode, and to examine the entire range of prices at each store before making a decision on where to buy a lawn mower.

Learn more about "median" : https://brainly.com/question/26177250

#SPJ11

Incidence rate (IR) is computed by dividing cases by total population and multiplying by 100,000. IR assumes a stable, well-defined population and provides frequency, risk, and comparability information.

To compute the incidence rate (IR) per 100,000, we need to first calculate the number of cases per 100,000 people. We can do this by dividing the number of new cases by the total population and then multiplying by 100,000:

IR = (28,639 / 316,128,839) * 100,000 = 9.07 (rounded to two decimal places)

Therefore, the incidence rate of pertussis in the United States in 2013 was 9.07 cases per 100,000 people.

The major assumption for using IR is that the population at risk is stable and well-defined over the time period of interest. This means that the population being studied should be clearly defined and not subject to large changes or migrations during the study period.

Properties of IR include:

1. It is a measure of the frequency of new cases of a disease or condition in a specific population over a defined time period.

2. It is expressed as a rate or proportion, typically per 100,000 people or per 1,000 person-years.

3. It provides information on the risk of developing a disease or condition within a population.

4. It can be used to compare the incidence of a disease or condition between different populations or time periods.

5. It is affected by the accuracy of case ascertainment and the completeness of reporting of new cases.

6. It does not provide information on the severity or duration of the disease or condition, or on the outcomes of those affected.

complete question: Assume That In 2013, The Average Population Of The United States Was 316,128,839. During The Same Year, 28,639 New Cases Of Pertussis Were Recorded. Compute The Incidence Rate Per 100,000. What Is The Major Assumption For Using IR? List The Properties Of IR.

Assume that in 2013, the average population of the United States was 316,128,839. During the same year, 28,639 new cases of pertussis were recorded.

Compute the incidence rate per 100,000.

What is the major assumption for using IR?

List the properties of IR.

know more about Incidence rate (IR) here: brainly.com/question/31493651

#SPJ11

The given expression is :

The multilpy are same So, we take the 10^(-6) Common

Answer:

False, the expected cell frequency is based on the researcher's opinion.

The expected cell frequency is not based on the researcher's opinion. It is calculated based on the sample data and the null hypothesis. The null hypothesis assumes that there is no relationship between the variables being studied. The expected cell frequency is the number of observations that would be expected in a particular cell under the null hypothesis. It is calculated using the row and column totals and the sample size. The expected cell frequency is used to calculate the chi-square statistic in a chi-square test of independence. Therefore, the expected cell frequency is not based on the researcher's opinion, but rather on statistical calculations using the sample data and the null hypothesis.

Learn more about frequency here

https://brainly.com/question/254161

#SPJ11

Step-by-step explanation:

z^(-11)•z^(-15)

z^(-11+-15)

z^(-11-15)

z^(-26)

Answer:

z^-26

Step-by-step explanation:

trust me it's verified on khan academy <3

The probability that a woman with breast cancer will survive after her surgery is less than -1.33 is approximately 0.0918.

Therefore P(X < 6) = 0.0918 or 9.18%.

 To find the probability that a woman with breast cancer will survive after surgery, we need to use the normal distribution formula.

z = (x - μ) / σ

where z =z-score

x=survival time in years,

μ =mean survival time,

and σ= standard deviation of survival time.

Let X be the survival time, then \(X ~ N(8, 1.5^2).\)

a) 10+ year survival probability:

I would like to find P(X > 10). Using the formula above, we get:

z = (10 - 8) / 1.5 = 1.33

A standard normal distribution table or calculator tells us that the probability that z is greater than 1.33 is approximately 0.0918.

Therefore P(X > 10) = 0.0918 or 9.18%. b) 5- to 7-year survival probabilities:

b) 5- to 7-year survival probabilities: I would like to find P(5 < X < 7).

Using the formula above, we get: z1 = (5 - 8) / 1.5 = -2

z2 = (7 - 8) / 1.5 = -0.67

From a standard normal distribution table or calculator, we know that the

probability that z is between -2 and -0.67 is approximately 0.1841.

Therefore P(5 < X < 7) = 0.1841 or 18.41%.

c) Probability of survival <6 years:

Find P(X < 6). Using the formula above, we get:

z = (6 - 8) / 1.5 = -1.33

A standard normal distribution table or calculator tells us that the probability that z is less than -1.33 is approximately 0.0918. Therefore P(X < 6) = 0.0918 or 9.18%.  

learn more about  probability

brainly.com/question/30034780

#SPJ4

Comparing the means of the two samples, we find that the difference between the means is significant. Therefore, we can reject the claim and conclude that male and female high school students have different exam scores.

To perform the two-sample t-test, we first calculate the standard error of the difference between the means using the formula:

SE = sqrt((s1^2 / n1) + (s2^2 / n2))

Where s1 and s2 are the population standard deviations of the male and female students respectively, and n1 and n2 are the sample sizes. Plugging in the values, we have:

SE = sqrt((47^2 / 49) + (4.3^2 / 53))

Next, we calculate the t-statistic using the formula:

t = (x1 - x2) / SE

Where x1 and x2 are the sample means. Plugging in the values, we have:

t = (239 - 21.1) / SE

We can then compare the t-value to the critical t-value at α = 0.01 with degrees of freedom equal to the sum of the sample sizes minus 2. If the t-value exceeds the critical t-value, we reject the null hypothesis.

In this case, the t-value is calculated and compared to the critical t-value using the provided standard normal distribution table. Since the t-value exceeds the critical t-value, we can reject the claim that male and female high school students have equal exam scores.

Therefore, the correct answer is:

B. Male and female high school students have different exam scores.

Learn more about hypothesis testing here: brainly.com/question/17099835

#SPJ11

Answer:

a) 0

b) 4.5

c) 3

d) 6

Step-by-step explanation:

Formula: 3x + 4y = 12

The questions contains the values of x. So here's an example of:

d) x = -4, y = ?

   Using the formula:   3(-4) + 4y = 12

                                     -12 + 4y = 12

                                      4y = 24

                                       y = 6

Do the same for the others!

∑ Hey, petalssquad10 ⊃

Answer:

( 10 x + 10 ) = 110

Step-by-step explanation:

As you can see this following diagram shown a vertical angles which  are angles that are opposite of each other when two lines cross. You can also see it kind of look like a "x". Vertical angles also means that they have the same angle measure. A example is if this angle is "110" then the other sides equal to "110''.

Hence, the equation we can be used to solve for x in the following diagram is:

( 10 x + 10 ) = 110

You can also refer to the image below:

xcookiex12

8/18/2022

Answer:

14 ≥ x

Step-by-step explanation:

Subtract 6 from both sides.

Hope this helps. Pls give brainliest.

Answer:

x\(\leq\)14

Step-by-step explanation:

First you have to switch the inequality:

x + 6 \(\leq\) 20

Then you have to subtract six from both sides

x+6-6 \(\leq\) 20-6

Since there are no other numbers on the side x is on the answer is:

x\(\leq\)14

Answer:

4 x X = y

Step-by-step explanation:

x = the amount of weeks

y = the amount you save

4 times the amount of weeks you put $4 in equals the amount of money you saved.