1 1 point What critical value should you use for a one-sample t-test if n = 48 and the alternative hypothesis is & # 12? Provide your answer to the thousandths place (3 decimal places). Type your answer..2 2 points An app developer made changes to an app, and wants to know whether they have improved the user experience for that app. Previously, the app got an average usability rating of 6.2. The app developer gathered data from a sample of 100 users after making the changes. For this sample of 100, the average rating was 7.3. The standard deviation for this sample was 2.6. Calculate the t-test value comparing the average user rating for this sample to the previous user rating of 6.2. Round your answer to the nearest hundredth. Type your answer.3 1 point For the app developer in question 2, the main thing they wanted to test is whether the new sample's usability rating was higher than the rating from before the changes. Which of the following would be the correct null hypothesis for them to use? O MS 6.2 O H = 6.2 O US7.3 O H = 7.34 1 point If the app developer instead wanted to test the hypothesis of whether usability ratings differed before and after the changes were made to the app, what would be the correct alternative hypothesis to use? O ( > 6.2 O H = 6.2 O u