# Question: State whether each of the following changes would make a

State whether each of the following changes would make a confidence interval wider or narrower. (Assume that nothing else changes.)

a. Changing from a 90% confidence level to a 99% confidence level.

b. Changing from a sample size of 30 to a sample size of 200.

c. Changing from a standard deviation of 20 pounds to a standard deviation of 25 pounds.

a. Changing from a 90% confidence level to a 99% confidence level.

b. Changing from a sample size of 30 to a sample size of 200.

c. Changing from a standard deviation of 20 pounds to a standard deviation of 25 pounds.

## Answer to relevant Questions

State whether each of the following changes would make a confidence interval wider or narrower. (Assume that nothing else changes.) a. Changing from a 95% level of confidence to a 90% level of confidence. b. Changing from a ...Use the data from Exercise 9.35. In exercise The weights of four randomly and independently selected bags of potatoes labeled 20 pounds were found to be 21.0, 21.5, 20.5, and 21.2 pounds. Assume Normality. a. Find a 95% ...Thirty GPAs from a randomly selected sample of statistics students at Oxnard College are available at this text's website. Assume that the population distribution is approximately Normal. The technician in charge of records ...Using data from NHANES, we looked at the pulse rate for nearly 800 people to see whether it is plausible that men and women have the same population mean. NHANES data are random and independent. Minitab output follows. a. ...In Exercise 9.63 you could not reject the null hypothesis that the mean amount spent by men and the mean amount spent by women for clothing are the same, using a two-tailed test with a significance level of 0.05. a. If you ...Post your question