1 Solves followings a Given the following information determ

1. Solves followings. a. Given the following information, determine the 98% confidence interval estimate of the population mean.: x 500, 12, n 50 b. Repeat part a using a 95% confidence interval. c. Repeat part a using a 90% confidence Interval. d. Review part ac and discuss the effect on the confidence interval estimator of decreasing the confidence interval. 2. Solves followings. a. A random sample of 100 observations was randomly drawn from a population whose standard deviation is 5. The sample mean was calculated as 400. Estimate the population mean with 99% confidence. b. Repeat part a with x 200. c. Repeat part a with x 100. d. Describe what happens to the width of the confidence interval estimate when the sample mean decreases.

Solution

For 98% confidence interval with the given values of population mean calculated and lies between the values 496<z<503.

Similarly, we need find the interval for 95% confidence interval and 90% confidence interval..

Since the intervals are in continuous level, there is not signification for the Population mean and standard deviation of the values