Ascientistemployed by a manufacturerof mosquito repellent claims that the average amount of time their repellent is effective is3.5 hours. However, an independent researchgroup believes that the claim is too low. To test there belief the research group randomlyselects 41 people and finds thatthemean time of effectiveness from the sample was 3.8 hours with a standard deviation of 0.76 hours. What is thecritical valuefor this test at the 2.5% level of significance?