- A. B. C. D. E. F. G. A scrap metal dealer claims that the mean of his cash sales is "no more than $80".But an IRS agent believes the dealer is untruthful. Observing a sample of 20 cash customers, the agent finds the mean purchased to be $91, with a standard deviation of $21.

- A. B. C. D. E. F. G. A quality assurance inspector periodically examines the output of a machine to determine whether it is properly adjusted. When set properly, the machine produces nails with a mean length of2.0 inches and population standard deviation of 0.07 inches. For a sample of 35 nails, the mean length is 2.025 inches and sample standard deviation of 0.065 inches.

- A. B. C. D. E. F. G. The director of admissions at a large unviersity says that 15% of high school juniors to whom she sends university pamphletseventually apply for admission. In a sample of 300 students to whom materials were sent, 30 students applied for admission.

- A. B. C. D. E. F. G. It is believed that the average number of years of experience the employees at this location is 8.7 years. Examining a random sample of 15 employees, he finds the mean lengthto be 7.5 years with a standard deviation of 2.5 years. Does this sample indicate that the mean years of experience of employees is lower than 8.7?

A.sample means,t-test,one sided (tail)

B.sample means, t-test, two-sided (tail)

C.sample means, z-test,one-sided (tail)

D.sample proportions,z-test,two-sided (tail)

E.sample means, t-test,one-sided (tail)

F.sample means,z-test,two-sided (tail)

G.sample proportions, z-test, one-sided (tail)

Below are some examples of hypothesis testing questions. Match the correct test to the question. 4} Heritage Union has said that 66% of US. adults have purchased life insurance. Suppose that for a random sample of 50 adults from a given US. city, a research finds that only 56% of them have purchased life insurance. At a 0.05 level of significance test, is this sample finding significantly lower than the 66% reported by Heritage Union? A. sample means. t-test. one sided (tail) A scrap metal dealer claims that the mean of his cash sales is "no more than $80". But an IRS B. sample means, t-test, two-sided (tail) agent believes the dealer is untruthful. Observing a sample of 20 cash customers, the agent finds the mean purchased to be $91 , with a standard deviation of $21. C. sample means, z-test, one-sided (tail) A quality assurance inspector periodically examines the output of a machine to determine D. sample proportions, z-test, two-sided (tail) whether it is properly adjusted. When set properly, the machine produces nails with a mean length of 2.0 inches and population standard deviation of 0.07 inches. For a sample of 35 E- sample means. t-lest. one-sided (tail) nails, the mean length is 2.025 inches and sample standard deviation of 0.065 inches. _ . F. sample means, z-test. two-Sided (tail) The director of admissions at a large unviersity says that 15% of high school juniors to whom _ . _ she sends university pamphlets eventually apply for admission. In a sample of 300 students to G- sample proportions, z-test, one-elded \"a", whom materials were sent, 30 students applied for admission. It is believed that the average number of years of experience the employees at this location is 8.7 years. Examining a random sample of 15 employees, he finds the mean length to be 7.5 years with a standard deviation of 2.5 years. Does this sample indicate that the mean years of experience of employees is lower than 3.7