# Question: a The sample variance of a random sample of 50

a. The sample variance of a random sample of 50 observations from a normal population was found to be s2 = 80. Can we infer at the 1% significance level that σ2 is less than 100?

b. Repeat part (a) increasing the sample size to 100.

c. What is the effect of increasing the sample size?

b. Repeat part (a) increasing the sample size to 100.

c. What is the effect of increasing the sample size?

**View Solution:**## Answer to relevant Questions

a. Estimate σ2 with 90% confidence given that n = 15 and s2 = 12.b. Repeat part (a) with n = 30.c. What is the effect of increasing the sample size?One important factor in inventory control is the variance of the daily demand for the product. A management scientist has developed the optimal order quantity and reorder point, assuming that the variance is equal to 250. ...a. Calculate the p-value of the test of the following hypotheses given that p̂ = .63 and n = 100:H0: p = .60H1: p > .60b. Repeat part (a) with n = 200. c. Repeat part (a) with n = 400.d. Describe the effect on the p-value ...Spam is of concern to anyone with an e-mail address. Several companies offer protection by eliminating spam e-mails as soon as they hit an inbox. To examine one such product, a manager randomly sampled his daily e-mails for ...According to the American Contract Bridge League (ACBL) bridge hands that contain two 4-card suits, one 3-card suit and one 2-card suit (4-4-3-2) occur with 21.55% probability. Suppose that a bridge-playing statistics ...Post your question