1. (5 points) This question is similar to Exercises 9 - 14 on pages 407 - 408 of the textbook. A sample of 80 observations results in a sample mean of 121. The population standard deviation is known to be 28. a. Construct a 95% confidence interval. b. Does the above sample evidence enable to conclude that the population mean is less than 130 with the 5% significance level? Conduct the test based on the critical value approach. c. Does the above sample evidence enable to conclude that the population mean is less than 130 with the 5% significance level? Conduct the test based on the p-value approach. d. Does the above sample evidence enable to conclude that the population mean is different from 130 with the 1% significance level? Conduct the test based on the critical value approach. e. Does the above sample evidence enable to conclude that the population mean is different from 130 with the 5% significance level? Conduct the test based on the p-value approach