1) A population follows a skewed distribution with mean u. A random sample of size 25 sample means is obtained. Which of the following in TRUE? (a) The sampling distribution for sample proportions can be used. (b) The sampling distribution for sample proportions cannot be used. (c) The sampling distribution for sample means can be used. (d) The sampling distribution for sample means cannot be used. 2) Suppose that we are testing Ho:p = 0.4 vs Ha:p > 0.4. A p-value of 0.023 was determined. Which of the following is a correct interpretation of this p-value? (a) The null hypothesis would be rejected at a 5% level but not a 1% level. (b) The null hypothesis would be rejected at a 1% level but not a 5% level. (c) The null hypothesis would be rejected at both 5% and 1% levels. (d) The null hypothesis would not be rejected at either the 5% or 1% level. 3) Which of the following is TRUE about the width of a confidence interval for a proportion? (a) The confidence interval is narrower for 99% confidence than for 95% confidence. (b) The confidence interval is wider for a 90% confidence than for a 95% confidence. (c) The width of the confidence interval increases when the sample size increases. (d) The width of the confidence interval decreases when the sample size increases. 4) What value of t-1 would be used to construct a 99% confidence interval for the mean with a sample size of n = 17. (a) 2.921 (b) 2.898 (c) 2.583 (d) 2.561

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