STAT 1350, 6/24 Discussion Questions

The heights (inches) of students in a graduate-level statistics are displayed below:

Student / Bob / Sue / Pam / Lee / Mary / Carl / Ace / Moe / Ann
Height / 68 / 69 / 63 / 73 / 67 / 66 / 69 / 70 / 71
1. / The median height (inches) of these students is
2. / The third quartile of these heights (inches) is
3. / The mean of these heights (inches) is
4. / The standard deviation of these heights (inches) is
5. / The main advantage of boxplots over stemplots and histograms is that
6. / The calorie counts for the 17 poultry brands are:
129 132 102 106 94 102 87 99 170 113 135 142 86 143 152 146 144
The first quartile of the 17 poultry hot dog calorie counts is

Here are the number of hours that each of a group of students studied for an exam:

2 4 22 2 1 4 1 5 5 4

7. / What is the median number of study hours?
8. / What is the mean number of study hours?
9. / What is the third quartile of the number of study hours?
10. / What is the standard deviation of the number of study hours?
11. / The data contain one high outlier (22 hours). Which of your results for the previous four questions would change if this were five hours instead of 22 hours? (You do not need to calculate new values.)
12. / For a distribution that is skewed to the left, usually the
13. / The five numbers in the five-number summary are

The following is a stemplot of 12 exam scores.

(The stem is the tens place and the leaf is the ones place.):

6 8

7 66

8 0488

9 22666

14. / The median is
15. / The mean is
16. / The standard deviation is a measure of the

This boxplot shows the distribution of heights of 16 undergraduate statistics students.

17. / From the above boxplot, approximately how many students are 69 inches or taller?
18. / From the above boxplot, what height would a student have to be in order to be taller than 60% of other students?
19. / A set of measurements has this boxplot:

Which point on this boxplot is the median of the distribution?
20. / Which of these statements about the standard deviation s is true?
A) / s is always 0 or positive.
B) / s should be used to measure spread only when the mean is used to measure center.
C) / s is a number that has no units of measurement.
D) / Both A and B are correct.
E) / Answers A, B, and C are correct.