Ultimate Mathematics Study Guide - Questions & Answers

In its 2016 Auto Reliability Survey, Consumer Reports asked subscribers to report their maintenance and repair costs. Most individuals are aware of the fact that the average annual repair cost for an automobile depends on the age of the automobile. A researcher is interested in finding out whether the variance of the annual repair costs also increases with the age of the automobile. A sample of 26 automobiles 4 years old showed a sample standard deviation for annual repair costs of $170 and a sample of 25 automobiles 2 years old showed a sample standard deviation for annual repair costs of $ 100a. State the null and alternative versions of the research hypothesis that the variance in annual repair costs is larger for the older automobiles.b. At a .01 level of significance, what is your conclusion? What is the p-value? Discuss the reasonableness of your findings.
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PLEASE help evaluate the expression to find the missing values in the table
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Consider the following two cash flow series of payments: Series A is a geometric series increasing at a rate of 9.5% per year. The initial cash payment at the end of year 1 is $1,000. The payments occur annually for 5 years. Series B is a uniform series with payments of value X occurring annually at the end of years 1 through 5. You must make the payments in either Series A or Series B.a. Determine the value of X for which these two series are equivalent if your TVOM is i = 9%. $b. If your TVOM is 8%, would you be indifferent between these two series of payments? Enter the PW for each series to support this choice.c. If your TVOM is 5%, would you be indifferent between these two series of payments? Enter the PW for each series to support this choice.
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1. In the file MajorSalary.xlsx, data have been collected from 111 College of Business graduates on their monthly starting salaries. The graduates include students majoring in management, finance, accounting, info systems, and marketing. Create a PivotTable in Excel to display the number of graduates in each major and the average monthly starting salary for students in each major.a. Which major has the most graduates?b. Which major has the highest average starting monthly salary?c. Use the PivotTable to determine the major of the student with the lowest overall starting salary?2. In the file Jensen.xlsx, Jensen auto is deciding whether to purchase a new maintenance contract for its new computer wheel alignment and balancing machine. The data in the file shows the relationship between usage and annual expense.a. Develop a scatter chart with usage as the independent variable.b. Use the data to develop a regression equation that could be used to predict the annual maintenance expense for a given numbers of hours of weekly usage. What is the model?c. How much of the variation in the sample values of annual maintenance does the model you estimate in part b explain (Hint: Use r squared to explain).Weekly Usage (hours)Annual Maintenance Expense13 17.010 22.020 30.028 37.032 47.017 30.524 32.531 39.040 51.538 40.0
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Bradley's Copiers sells and repairs photocopy machines. The manager needs weekly forecasts of service calls so that he can schedule service personnel. Use the actual demand in the first period for the forecast for the first week so error measurement begins in the second week. The manager uses exponential smoothing with a = 0.1. Forecast the number of calls for week 6, which is next week. Week Actual Service Calls 21 8 2 34 3 38 4 27 5 25 The forecast for week 6 is ________ service calls.
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In a certain year, when she was a high school senior, Idonna scored 671 on the mathematics part of the SAT. The distribution of SAT math scores in that year was Normal with mean 509 and standard deviation 115 . Jonathan took the ACT and scored 24 on the mathematics portion. ACT math scores for the same year were Normally distributed with mean 21.1 and standard deviation 5.3 . Find the standardized scores (0.01) for both students. Assuming that both tests measure the same kind of ability, who had the higher score?Idonna's standardized score is ____ Jonathan's standardized score is _____A.) Idonna's score is higher than Jonathan'sB.) Idonna's score is less than Jonathan'sC.) Scores are equal
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Personal income. The Annual Demographic Supplement to the current Population Survey interviewed more than 128,000 people in March 2001. The Census Bureau reports that the mean income of the Hispanic males interviewed was $22,771. The mean income for the non- Hispanic white males interviewed was $41,798. Is each of the bold numbers a parameter or a statistic?
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In a group of 100 politicians, 40 are in Party I and 60 are in Party II. Members of Party I are incapable of changing their minds about anything. Members of Party II change their minds completely randomly every day, independently of all others and also independently of all evidence. Tomorrow, the politicians are going to vote on Proposition 88. Here is a summary of their opinions today. Of the 40 members in Party I, 25 are in favor of Prop 88 and 15 are against. Of the 60 members in Party II, 10 are in favor and 50 are against. Assume that each member in Party II changes their mind based on the toss of a coin: if it lands heads they switch to the opposite opinion and if it lands tails they don't change their mind. What is the distribution of the number of members in Party II who will favor Prop 88 tomorrow?
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HELP PLEASE I WILL MARK BRAINOEST
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Find angle O if angle R is 22
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What is the area of a circle that has a radius of 5 meters
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Please zoom in,if needed
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How many students does Mr. Carter have? Choose the correct equation and answer.
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HELP PLEASE I WILL NARK BRAINLIEST
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Are the two polygons similar?If they are write a similarly statement
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Based on the graph, what is the initial value of the linear relationship? A coordinate plane is shown. A line passes through the y-axis at -2 and the x-axis at 3. 2 0 two over three 3Question 4(Multiple Choice Worth 4 points)(05.05)Which scenario best matches the linear relationship expressed in the equation y = 32x + 80? Joseph has $80 in his bank account and spends $32 each day. Joseph has $80 in his bank account and earns $32 each day. Joseph had $32 in his bank account and deposited another $80. Joseph has $32 in his bank account and earns $80 each day.Question 5(Multiple Choice Worth 4 points)(05.05)David and Amanda are trying to figure out how long they can live off their $12,350 savings if they spend $240 each month. They have each created an equation.Davids Equation Amandas Equationy = 12,350 (240x) y = 12,350 + (240x)Which person has the correct equation to model this linear relationship? Amandas equation is correct, because their spending will be multiplied by the number of months and then added to their savings. Amandas equation is incorrect, because their spending will increase the amount of their savings. Davids equation is correct, because their spending will be multiplied by the number of months and then subtracted from their savings. Davids equation is incorrect, because their spending should be a fixed amount and should not be multiplied.You must check the box below prior to submitting your exam! Check this box to indicate you are ready to submit your examFDK161.10
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Based on the graph, what is the initial value of the linear relationship? A coordinate plane is shown. A line passes through the y-axis at -2 and the x-axis at 3. 2 0 two over three 3Question 4(Multiple Choice Worth 4 points)(05.05)Which scenario best matches the linear relationship expressed in the equation y = 32x + 80? Joseph has $80 in his bank account and spends $32 each day. Joseph has $80 in his bank account and earns $32 each day. Joseph had $32 in his bank account and deposited another $80. Joseph has $32 in his bank account and earns $80 each day.Question 5(Multiple Choice Worth 4 points)(05.05)David and Amanda are trying to figure out how long they can live off their $12,350 savings if they spend $240 each month. They have each created an equation.Davids Equation Amandas Equationy = 12,350 (240x) y = 12,350 + (240x)Which person has the correct equation to model this linear relationship? Amandas equation is correct, because their spending will be multiplied by the number of months and then added to their savings. Amandas equation is incorrect, because their spending will increase the amount of their savings. Davids equation is correct, because their spending will be multiplied by the number of months and then subtracted from their savings. Davids equation is incorrect, because their spending should be a fixed amount and should not be multiplied.You must check the box below prior to submitting your exam! Check this box to indicate you are ready to submit your exam
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b = 45 x 9 what is b ?
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Evaluate the-5+ (-6) =-9 +(+7)=-3 + (-11)-5 - (+13)-11-(-19)14+ (-7)=
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Whats Evaluate to (2/3)^2
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A cement pathway of uniform width is to be poured around a rectangular swimmingpool measuring 16 feet wide by 28 feet long. Given that (16+2x) is an expression forthe width of the outer edge of the path and (28+2x) is an expression for the length ofthe outer edge of the path, what would a quadratic in standard form for the area ofthe path (remember to take the area of the pool away from the area of the wholeouter edge.O A (20) = 4x2 +88x + 448O A (2) = 4x2 +882O A (2) = 2x2 + 440 + 448O A (x) = 2.2 + 442
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Find the value of x.
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Solve for y.5+2y3
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Which is a correct way to name the line in this picture? A. B. C. D.
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