1-20chapter stats

It appeared that the bivariate normal probability

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Unformatted text preview: ier than the EPA stipulated clean air standards. C. Acorn's air is better than the EPA stipulated clean air standards. D. Acorn's air meets the EPA stipulated clean air standards. 1-1779 Chapter 01 - An Introduction to Business Statistics 65. Five years ago, the average starting salary of a new college graduate with a major in marketing was $34,000. A random sample of 10 graduates from this year's graduating class of a local university yielded the following starting salaries in thousands of dollars: 28, 36, 25, 37, 35, 24, 38, 45, 39, and 36. The local university wants to determine if the median starting salary for marketing graduates has increased in the last five years. State the alternative hypothesis. Assume that the population of starting salaries in marketing is not normally distributed. A. H0: Md < 34,000 B. H0: Md > 34,000 C. H0: Md ≠ 34,000 D. H0: Md = 34,000 66. Five years ago, the average starting salary of a new college graduate with a major in marketing was $34,000. A random sample of 10 graduates from this year's graduating class of a local university yielded the following starting salaries in thousands of dollars: 28, 36, 25, 37, 35, 24, 38, 45, 39, and 36. The local university wants to determine if the median starting salary for marketing graduates has increased in the last five years. Assume that the population of starting salaries in marketing is not normally distributed. Using α = .05, can we conclude that the starting salaries increased in the last five years? A. Reject the null hypothesis B. Fail to reject the null hypothesis 67. Five years ago, the average starting salary of a new college graduate with a major in marketing was $34,000. A random sample of 10 graduates from this year's graduating class of a local university yielded the following starting salaries in thousands of dollars: 28, 36, 25, 37, 35, 24, 38, 45, 39, and 36. The local university wants to determine if the median starting salary for marketing graduates has increased in the last five years. Assume that the population of starting salaries in marketing is not normally distributed. The p-value is found to be .0547. Using α = .10, can we conclude that the starting salaries increased in the last five years? A. Yes B. No 1-1780 Chapter 01 - An Introduction to Business Statistics 68. An e-business/e-commerce information technology consulting company wants to compare the effectiveness of three programming languages that its programmers use. Currently each programming language is used by approximately 1/3 of the programmers employed by the company. The director of programming division randomly selected 5 programmers from the users of each of the three programming languages and assigned the same simple programming task to each programmer. It is known that all three populations have highly skewed distributions with extreme outliers. Calculate the value of Ti (rank sum) for Program B. A. 23 B. 48 C. 49 D. 57 69. An e-business/e-commerce information technology consulting company wants to compare the effectiveness of three programming languages that its programmers use. Currently each programming language is used by approximately 1/3 of the programmers employed by the company. The director of programming division randomly selected 5 programmers from the users of each of the three programming languages and assigned the same simple programming task to each programmer. It is known that all three populations have highly skewed distributions with extreme outliers. The rank sum values for each of the programming groups are: T1 = 23, T2 = 48, and T3 = 49. At α = .05, does the median time required to program a simple task differ between the three different programming languages? A. H = 4.34, reject the null hypothesis B. H = 4.24, fail to reject the null hypothesis C. H = 5.99, reject the null hypothesis D. H = 5.99, fail to reject the null hypothesis 1-1781 Chapter 01 - An Introduction to Business Statistics 70. A copy machine service company provides maintenance and repair service for different types and brands of copiers. The manager of the repair department wants to know if the repair time for brand A is higher than the repair time for brand B. The manager randomly selected 8 repair records associated with brand A and 8 repair records associated with brand B. The repair times for both samples in minutes are given below. The distribution of repair times for both brand A and brand B is highly skewed. What is the appropriate alternative hypothesis for this problem? A. HA: DA is shifted to the left or right of DB B. HA: DA is shifted to the right of DB C. C. HA: DA is shifted to the left of DB D. HA: DA is shifted equal to DB 71. A copy machine service company provides maintenance and repair service for different types and brands of copiers. The manager of the repair department wants to know if the repair time for brand A is higher than the repair time for brand B. The manager randomly selected 8 repair records associated with brand A and 8 repair records associated with brand B. The repair times...
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