Homework 8 Solution
Chapter 16
16.15 (a) H 0 : The patient is healthy ( or the patient should no see a doctor);
H a : The patient is ill ( or the patient should see a doctor).
A Type I error is a false positive sending a healthy patient to the doctor. A T
Assignment 6 Solutions
x 11.32. State: How large an SRS is needed to reduce the standard deviation of to 0.5 inch? Formulate: Use the formula for the standard deviation of the mean, and solve for the sample size. Solve: We need to choose n so that 2.8 / n
Assignment 4 Solutions
8.17. (a) This is an observational study: Beahvior (alcohol consumption) is observed, but no treatment is imposed. 8.18. (c) This study shows an association between the two, but not a cause-and-effect relationship. 8.19. (b) The sam
Assignment 3 Solutions
4.13. (a) More affluent families can afford more education. 4.15. (a) Without the outlier, the remaining points would be less scattered around the line.
2.5 (a) The five-number summary is Min = 23,040, Q1=30,315, M=31,975, Q3=32,710, Max=33,650. (b) Note the distances between the numbers in the five-number summary: In order, the gaps are 7275, 1660, 735, and 940 pounds. That the first two gaps are larger
Assignment 1 #1.6
#1.8 The distribution is roughly symmetric. Based on the histogram, the center is near 23 min, and the spread is from 15 to 31 min. If we look at the actual data, we find that the center(median) is 22.7 min, and the times range from 15.2