4. You are given the following information obtained from a random sample of 4 observations. 25 47 32 56 You want to determine whether or not the mean of the population from which this sample was taken is significantly different from 48. (Assume the population is normally distributed.) a. State the null and the alternative hypotheses. b. Determine the test statistic. C. Determine the p-value; and at 95% confidence test to determine whether or not the mean of the population is significantly different from 48