Forty-seven fast-food restaurant hourly employees were surveyed to see how many hours they worked per week, on average. The following data was obtained: 29, 39, 42, 25, 30, 50, 21, 44, 11, 22, 30, 27, 23, 31, 36, 29, 41, 36, 29, 40, 17, 15, 34, 40, 23, 37, 28, 12, 16, 21, 31, 45, 37, 28, 30, 35, 35, 29, 12, 35, 27, 37, 48, 35, 41, 29, 28 Construct a 87% confidence interval for the mean number of hours per week that the population of fast- food restaurant employees work. 18 8 α tą Margin of Error: E We are 87% confident that fast-food restaurant hourly employees, on average, work between hours and hours per week.

Below are the ages of students in a class in mathematics for elementary teachers. 19, 19, 19, 20, 20, 20, 20, 20, 20, 21, 21, 21, 22, 22, 22, 22, 22, 22, 24, 25, 25, 27, 28, 38, 43, 44, 47

The following items represent the number of birds observed at a given feeder over the past several days.  What is the mean number of birds to visit that feeder? 96, 76, 54, 64, 7, 32, 72

Twenty-nine college students, identified as having a positive attitude about Mitt Romney as compared to Barack Obama in the 2012 presidential election, were asked to rate how trustworthy the face of Mitt Romney appeared, as represented in their mental image of Mitt Romney’s face. Ratings were on a scale of 0 to 7, with 0 being “not at all trustworthy” and 7 being “extremely trustworthy.” Here are the 29 ratings:  2.6 3.2 3.7 3.3 3.4 3.6 3.7 3.8 3.9 4.1 4.2 4.9 5.7 4.2 3.9 3.2 4.5 5.0 5.0 4.6 4.6 3.9 3.9 5.3 2.8 2.6 3.0 3.3 3.7   a 95% confidence interval for the mean rating. Is there significant evidence at the 5% level that the mean rating is greater than 3.5 (a neutral rating)?