1. Heights of tall buildings A researcher estimates that the average height of buildings of 30 or more stories in a large city is at least 700 feet high. A random sample of 10 buildings is selected, and the heights in feet are shown. who of high Data: 485, 511, 841, 725, 615, 520, 535, 635, 616, and 582. (a) Ho: Ha: At alpha-0.05, is there enough evidence to reject the claim? Hypothesis (b) Test statistic or p-value Conclusion Find a 95% Confidence Interval for the true height of these buildings. Confidence Interval. Conclusion. used seat belts. In a rodom sar 2. Retention Test Scores A random sample of non-English majors at a selected college was used in a study to see if the student retained more from reading a 19th century novel or by watching it in DVD form. Each student was assigned one novel to read and a different one to watch, and then they were given a hundred point quiz on each novel. The test results are shown. Book 90 80 90 75 80 90 84 DVD 85 72 80 80 70 75 80 = At alpha 0.05, can it be concluded that the book scores are higher than the DVD scores? Hypothesis Ho: Test statistic Ha: or p-value Conclusion