4. A researcher has designed a survey that is believed to take 90 minutes to complete on average. Given a sample size of 7 of people who volunteered because they don't have a life; the findings are that It takes 2 hours to complete the survey with a o of 15 minutes. Is there sufficient evidence to conclude that the completion time differs from the intended duration. Conduct the test at the .10 level. State our hypothesis: a. Find the Critical Value b. Find the test statistic