The random sample shown below was selected from a normal distribution. 7, 5, 9, 8, 4, 3 Complete parts a and b. a. Construct a 90% confidence Interval for the population mean p. 4.41 7.59 ) (Round to two decimal places as needed.) b. Assume that sample mean x and sample standard deviation s remain exactly the same as those you just calculated but that are based on a sample of n = 25 observations. Repeat part a. What is the effect of increasing the sample size on the width of the confidence intervals? The confidence interval Is ( {) . (Round to two decimal places as needed.) What is the effect of the sample size on the width of the confidence interval? O A. As the sample size increases, the width increases. O B. As the sample size increases, the width stays the same, O C. As the sample size increases, the width decreases