A researcher wants to estimate the mean number of hours per day that elementary aged school children spend watching TV in order to direct subsequently planned research in reducing time spent watching TV among young children. She collects a sample of 424 children and calculates a 95% confidence interval for number of hours per day spent watching TV: Confidence interval - (1.93, 4.25).

a. (3pts) Interpret this confidence interval in a sentence below.

b. (5pts) Would a two-sided hypothesis test, performed at significance level 0.05, for testing whether mean number of hours per day spent watching TV is equal to 2.5. reject the null hypothesis? How about a test for mean number of hours per day being equal to 1.2? (You need to have two answers for this question. The first is for p = 2.5, and the second is for u = 1.2).

Atrain traveled for 1.5 hours to the first station, stopped for 30 minutes, then traveled for 4 hours to the final station where it stopped for 1 hour. the total distance traveled is a function of time. which graph most accurately represents this scenario? a graph is shown with the x-axis labeled time (in hours) and the y-axis labeled total distance (in miles). the line begins at the origin and moves upward for 1.5 hours. the line then continues upward at a slow rate until 2 hours. from 2 to 6 hours, the line continues quickly upward. from 6 to 7 hours, it moves downward until it touches the x-axis a graph is shown with the axis labeled time (in hours) and the y axis labeled total distance (in miles). a line is shown beginning at the origin. the line moves upward until 1.5 hours, then is a horizontal line until 2 hours. the line moves quickly upward again until 6 hours, and then is horizontal until 7 hours a graph is shown with the axis labeled time (in hours) and the y-axis labeled total distance (in miles). the line begins at the y-axis where y equals 125. it is horizontal until 1.5 hours, then moves downward until 2 hours where it touches the x-axis. the line moves upward until 6 hours and then moves downward until 7 hours where it touches the x-axis a graph is shown with the axis labeled time (in hours) and the y-axis labeled total distance (in miles). the line begins at y equals 125 and is horizontal for 1.5 hours. the line moves downward until 2 hours, then back up until 5.5 hours. the line is horizontal from 5.5 to 7 hours