CHALLENGE ACTIVITY 5.2.2: Excel: Hypothesis test for a population mean. Click this link to download the spreadsheet for use in this activity. 469946.3289048.qx3zqy7 Jump to level 1 Use Sheet 1 of the Excel file to answer the following questions. A school administrator believes that the mean class GPAs for a given course are higher than the preferred mean of 2.750 at a significance level of 0.05, and checks a randomly chosen sample of 50 classes. Create a histogram, and calculate, the t-statistic, and the p-value. From the histogram, can normality be assumed? Pick x = -1 t = = p = Round all answers to 3 decimal places. Since the p-value is Pick than the significance level 0.05, the null hypothesis Pick Pick evidence exists that the mean GPA is greater than 2.750.