In: Statistics and Probability
Use a significance level of 0.05 to test the claim that the average life of cell phones equals 5 years. This is done after a study where the following statistical data are collected: n = 27, (x bar) ̅ = 4.6 years and s = 1.9 years. a) Indicates Ho Ha, b) draw the graph, c) find the critical value, d) find the t-statistic, e) performs the hypothesis test to reject or fail to reject the null hypothesis. f) Find the interval at 95% confidence All work must appear to receive credit