Department store gives in-service training to its salesmen which is followed by a test. It is consideringwhether it should terminate the service of any salesman who does not do well in the test. The followingdata gives the test scores and sales made by nine salesmen during a certain period.Test scores 141924211526222019Sales313648375045334139Calculate the coefficient of correlation between the test scores and the sales. Does it indicate thatthe termination of services of low test scores is justified? Find also the probable error.

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Answered: Department store gives in-service…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Test the claim about the difference between two population means μ1 and μ2 at the level of significance alphaα. Assume the samples are random and independent, and the populations are normally distributed. Claim: μ1less than or equals≤μ2; alphaαequals=0.10 Assume σ2 1 not equals≠ σ2 2 Sample statistics: x1 equals=2419, s1equals=176, n1equals=12 and x2 equals=2290, s2equals=52, n2 equals=9 Identify the null and alternative hypotheses. Choose the correct answer below. A. Upper H0: μ1less than<μ2 Upper Ha: μ1greater than or equals≥μ2 B. Upper H0: μ1greater than>μ2 Upper Ha: μ1less than or equals≤μ2 C. Upper H0: μ1less than or equals≤μ2 Upper Ha: μ1greater than>μ2 D. Upper H0: μ1not equals≠μ2 Upper HHa: μ1equals=μ2 E. Upper H0: μ1greater than or equals≥μ2 Upper Ha: μ1less than<μ2 F. Upper H0: μ1equals=μ2 Upper Ha: μ1not equals≠μ2 Find the standardized…
Use the table to find the following, unit price being your (x) and units sold (y). a. Find linear correlation coefficient. Years of Experience Salary in 1000$ 2 3. 15 28 42 13 64 50 16 90 11 58 8 54 b. Find the line of best fit. c. How many units will sell if the unit price was 0.85.
Does a major league baseball team's record during spring training indicate how the team will play during the regular season? Over a six-year period, the correlation coefficient between a team's winning percentage in spring training and its winning percentage in the regular season is . Shown are the winning percentages for the American League teams during a season. Team SpringTraining RegularSeason Team SpringTraining RegularSeason Baltimore Orioles 0.409 0.424 Minnesota Twins 0.492 0.542 Boston Red Sox 0.426 0.588 New York Yankees 0.579 0.559 Chicago White Sox 0.411 0.535 Oakland A's 0.690 0.468 Cleveland Indians 0.578 0.492 Seattle Mariners 0.492 0.379 Detroit Tigers 0.578 0.459 Tampa Bay Rays 0.722 0.601 Kansas City Royals 0.540 0.461 Texas Rangers 0.640 0.491 Los Angeles Angels 0.724 0.619 Toronto Blue Jays 0.442 0.533 a. What is the correlation coefficient between the spring training and the regular season winning percentages…
An economist wants to determine whether there is a linear relationship between a country's gross domestic product (GDP) and carbon dioxide emissions. The data are shown in the table below. c. Compute and interpret the correlation coefficient. d. Compute and interpret the coefficient of determination. e. Test for the significance of the linear relationship. Use a 0.05 level of significance. State your conclusion. Hint: Your conclusion is either of the following. • There is a significant linear relationship between a country's gross domestic product (GDP) and carbon dioxide emissions. • There is no significant linear relationship between a country's gross domestic product (GDP) and carbon dioxide emissions. GDP 1.6 3.6 4.9 1.1 0.9 2.9 2.7 2.3 1.6 1.5 (trillion dollars) Carbon Dioxide Emissions 428.2 828.8 1214.2 444.6 264 415.3 571.8 454.9 358.7 573.5 (millions of metric tons)
The boxplot below shows salaries for CPAS and Actuaries in a town. СРА Actuary 20 30 40 50 60 70 80 90 100 110 Salary (thousands of $) If a person is making the third quartile salary for a CPA, they are making less than % of Actuaries.
A corporation administers an aptitude test to all new sales representatives. Management is interested in the possible relationship between test scores and the sales representatives' eventual success. The accompanying table records average weekly sales (in thousands of dollars) and aptitude test scores for a random sample of eight representatives. Construct a scatter plot with weekly sales as the dependent variables and test scores as the independent variable. 13 Weekly sales 10 12 30 26 20 15 14 53 61 83 76 78 86 65 58 Test score Choose the correct graph below A. Test OB. T 16 24 32 Wy C Oo. 70 Test scores U
Fully explain the issues and problems with the below correlational data. Focus on the data in the highlighted box versus the rest of the data. Do not try to explain the data, but rather focus on the statistical issues and problems. IF YOU CAN'T SEE THE IMAGE HERE. PLEASE GO TO THIS LINK Linke 10 6. 8. 7. 5. 4. 10 20 30 40 50 60 70 80 90 100 Age Enjoyment of Hip-Hop
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A researcher is interested in the relationship between age and golf performance. The researcher claims that golf performance improves with age, that is, as one gets older, his or her golf scores decrease. [In golf, a low score represents better performance; a higher score represents worse performance.] The researcher randomly selects a group of eight golfers at the local golf course and records their ages and their most recent golf score. The data that were collected are presented below: Golfer's Name Diego Tiger Bogart Marilyn Jennifer Mitch Bubba Amber Age (years) Variable 1 23 14 38 43 49 36 72 Golf Score Variable 2 92 112 77 84 81 72 79 86 Which of the following are the correct statements of the null and alternate hypotheses, Ho and HA? O Ho: M₁ M₂ and HA: H1 H₂
3
The more serving of fruits and vegetables that people tend to eat during the week, the lower their levels of cholesterol. What type of correlation vegetables eaten and cholesterol levels? A positive B negative
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