rom these data that brown-eyedstudents appear more trustworthy compared to theirblue-eyed counterparts? Test the hypothesis thatthe average scores for the two groups are the same.(Software gives k= 77.3.)7.44 Facebook use in college. Because of Facebook'spopularity among college students, there is a greatdeal of interest in the relationship between Facebookuse and academic performance. One study collected-information on n=at the relationships among frequency of Facebook use,participation in Facebook activities, time spent preparingfor class, and overall GPA.4Students reported preparing for class an average of706 minutes per week, with a standard deviation of526 minutes. Students also reported spending an averageof 106 minutes per day on Facebook, with a standarddeviation of 93 minutes; 8% of the students reportedspending no time on Facebook.1839 undergraduate students to look(a) Construct a 95% confidence interval for the averagenumber of minutes per week a student prepares for class.(b) Construct a 95% confidence interval for the averagenumber of minutes per week a student spends onFacebook. (Hint: Be sure to convert from minutes per dayto minutes per week.)(c) Explain why you might expect the populationdistributions of these two variables to be highlyskewed to the right. Do you think this fact makes yourconfidence intervals invalid? Explain your answer.7.45 Possible hiases? Refer to the previous exercise.

Confidence interval: Since the population standard deviation is unknown, t distribution can be used…

(a) Construct a 95% confidence interval for the average number of minutes per week a student prepares for class. (b) Construct a 95% confidence interval for the average number of minutes per week a student spends on Facebook. (Hint:, Be sure to convert from minutes per day to minutes per week.) (c) Explain why you might expect the population distributions of these two variables to be highly skewed to the right. Do you think this fact makes your confidence intervals invalid? Explain your answer.