A study on the personality characteristics of drug dealers sampled 100 convicted drug dealers and scored them each on the Wanting Recognition(WR) Scale, which provides a quantitative measure of aperson's need for approval and sensitivity to social situations.(Higher scores indicate a greater need forapproval.) The sample of drug dealers had a mean WR score of 40, with a standard deviation of 5. Use this information to find an interval estimate of the mean WR score for all convicted drug dealers. Use a confidence level of 95%. Interpret the result.

A. The 95% confidence interval for mean WR score indicates that the true mean WR score for all drug dealers is between __ and __ with 95% confidence.

B. The 95% confidence interval for mean WR score indicates that 95% of convicted drug dealers have a WR score between ___ and ___.

C. The 95% confidence interval for mean WR score indicates that the true mean WR score for convicted drug dealers is between ____ and ____ with 95% confidence.

D.

The 95% confidence interval for mean WR score indicates that 95% of all drug dealers have a WR score between ___ and ____.

The mean and standard deviation of a random sample of n measurements are equal to 33.8 and 3.9, respectively.

a. Find a 95% confidence interval for if n=121.

b. Find a 95% confidence interval for if n=484.

c. Find the widths of the confidence intervals found in parts a and b. What is the effect on the width of a confidence interval of quadrupling the sample size while holding the confidence coefficientfixed?

In a representative household telephone survey of 2,645 adults, 15% reported that they own at least one gun. Of those that own agun, 4% own a handgun. Suppose that one of the 2,645 adults surveyed is randomly selected.

a. What is the probability that the adult owns at least onegun?

b. What is the probability that the adult owns at least one gun and the gun is ahandgun?

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