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Problem 110.28 For a sample of 12 items from a normally distributed population for which the standard
Problem 1
10.28 For a sample of 12 items from a normally distributed population for which the standard
deviation is = 17.0, the sample mean is 230.8. At the 0.05 level of significance, test H0: ≤ 220 versus H1: >220.
Please round to 3 decimals.
The critical value is
Problem 2
According to the Federal Reserve Board, the mean net worth of U.S. households headed by persons 75 years or older is $640,000. Suppose a simple random sample of 50 households in this age group is obtained from a certain region of the United States and is found to have a mean net worth of $615,000, with a standard deviation of $120,000.
a. The lower bound of the 95% confidence interval for the population mean is .
b. The upper bound of the 95% confidence interval for the population mean is
Problem 3
10.64 The director of admissions at a large university says that 15% of high school juniors to whom she sends university literature eventually apply for admission. In a sample of 300 persons to whom materials were sent, 30 students applied for admission. In a two-tail test at the 0.05 level of significance, answering the following questions to determine whether we should reject the director's claim:
Please round your answer to 2 decimal places
a. The critical values are +/-
Problem 4
10.60 For a simple random sample, n = 200 p = 0.34. At the 0.01 level, test H0: pi = 0.40 versus H1: pi ≠ 0.40 by answering the following questions:
Please round your answer to 2 decimal places
a. The critical values are +/-
