1-20chapter stats

What is the appropriate alternative hypothesis for

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: is B. Fail to reject the null hypothesis 78. In an effort to improve productivity in its factory, a firm recently instituted a training program for its workers. One of the work crews consisted of 14 workers. Seven workers from this crew were selected at random to attend the training course. All seven workers selected successfully completed the training course. The remaining seven workers served as a control group and did not attend the training course. Three months after the training course, a foreman who did not know which employees attended the training course was asked to rank all 14 employees in terms of their productivity. A rank of 14 indicates the most productive employee in the crew while a rank of one indicates the least productive worker. State the null hypothesis for this problem. A. H0: DT ≤ DU B. H0: DT ≥ DU C. H0: DT ≠ DU D. H0: DT > DU 1-1786 Chapter 01 - An Introduction to Business Statistics 79. In an effort to improve productivity in its factory, a firm recently instituted a training program for its workers. One of the work crews consisted of 14 workers. Seven workers from this crew were selected at random to attend the training course. All seven workers selected successfully completed the training course. The remaining seven workers served as a control group and did not attend the training course. Three months after the training course, a foreman who did not know which employees attended the training course was asked to rank all 14 employees in terms of their productivity. A rank of 14 indicates the most productive employee in the crew while a rank of one indicates the least productive worker. At α = .05, can it be concluded that training was beneficial in improving productivity? A. Reject the null hypothesis, training is beneficial B. Fail to reject the null hypothesis, cannot determine if the training makes a difference 80. An international economist believes that there is a significant relationship between the amount of debt and the rate of unemployment. He randomly selected six countries to determine if there is a significant relationship between debt and unemployment rate. In the following table, debt figures for the 6 countries are given in billions of dollars and the corresponding unemployment rate is given in percentages. He also discovered that both the distribution of debt and the distribution of unemployment rate were highly skewed. Use Spearman's rank correlation and determine if there is a significant correlation between debt and unemployment rate. Show the rank correlation. A. rs = .914, reject the null hypothesis B. rs = .886, fail to reject the null hypothesis C. rs = .886, reject the null hypothesis D. rs = .914, fail to reject the null hypothesis 1-1787 Chapter 01 - An Introduction to Business Statistics 81. A random sample of 11 third year medical school students took a comprehensive written exam as well as a comprehensive oral exam. The scores on both exams are given below. It is established that both test scores have highly non-normal distributions. The medical examination board wants to know if the oral exam scores are higher than the written exam scores. State the appropriate null hypothesis for this problem. A. H0: The probability distribution of written exam scores is identical to the probability distribution of oral exam scores. B. H0:The probability distribution of written exam scores has shifted to the left of the probability distribution of oral exam scores. C. H0:The probability distribution of written exam scores has shifted to the right of the probability distribution of oral exam scores. D. H0:The probability distribution of written exam scores has shifted to the left or right of the probability distribution of oral exam scores. 1-1788 Chapter 01 - An Introduction to Business Statistics 82. A random sample of 11 third year medical school students took a comprehensive written exam as well as a comprehensive oral exam. The scores on both exams are given below. It is established that both test scores have highly non-normal distributions. At = .05, can it be concluded that the oral exam scores are higher than the written exam scores? A. Reject the null hypothesis B. Fail to reject the null hypothesis 83. Given the following sample data: .980, 1.01, .970, .990, 1.00, 1.00, .980, .970, .980, and . 999, run a sign test on H0: Md = 1.00 with a 2-sided alternative at α = .05. What do you conclude? A. Reject the null hypothesis, p-value = .0352 B. Fail to reject the null hypothesis, p-value = .004 C. Reject the null hypothesis, p-value = .004 D. Fail to reject the null hypothesis, p-value = .0352 84. The claim of the manufacturer of cell phone batteries is that the median life of a battery is more than 40 hours. Suppose a random sample of 75 batteries finds that 32 have a life of more than 40 hours. State the null hypothesis to test the claim. Assume that the population of all battery lives is not normally distributed. A. H0: Md ≥ 40 B. H0: Md ≠ 40 C. H0: Md >...
View Full Document

Ask a homework question - tutors are online