Answer:
C. becomes narrower
Step-by-step explanation:
If the confidence level is reduced from 95% to 90%, then, the confidence interval for u becomes narrower, i.e., we are less sure that the true value of u is contained inside the new interval. With a 95% confidence interval there is a probability of 0.95 that the parameter u is inside the interval and with a 90% confidence interval there is a probability of 0.90 that the parameter u is inside the interval.
Answer: the correct option is C
Step-by-step explanation:
The 95% confidence interval for the population mean is determined to be 75.38 to 86.52. If the confidence interval is reduced to 90%, the the confidence interval for u will become narrower. This is because there is a reduction in the margin of error. It would result to lesser possible values for the mean.
