18 Questions
| Total Attempts: 101

You may use scrap paper, but no work will be graded. Good luck & have fun!

Questions and Answers

- 1.What is the median of the following set of scores? 18, 6, 14, 10, 12
- A.
10

- B.
14

- C.
18

- D.
12

- 2.What is the name of the most frequently occurring number in a data set?
- A.
Mean

- B.
Mode

- C.
Range

- D.
Median

- 3.Calculate this when you want to find the arthimetic average of a data set.
- A.
Mode

- B.
Median

- C.
Mean

- D.
Standard Deviation

- 4.The name of the middle number in a data set.
- A.
Mean

- B.
Mode

- C.
Median

- D.
Range

- 5.Consider the following ogive of the scores of students in an introductory statistics course: A grade of C or C+ is assigned to a student who scores between 55 and 70. The percentage of students that obtained a grade of C or C+ is:
- A.
25

- B.
30

- C.
20

- D.
15

- E.
50

- 6.The median age of five people in a meeting is 30 years. (All of the people are different ages.) One of the people, whose age is 50 years, leaves the room. The median age of the remaining four people in the room is
- A.
40

- B.
30

- C.
25

- D.
Less than 30

- E.
Cannot be determined from the information given

- 7.
- A.
Cannot be determined from the information given

- B.
8.7

- C.
5.75

- D.
6.00

- E.
6.47

- 8.
- A.
Mean

- B.
Median

- C.
Mode

- D.
Either the mean or median. It doesn't matter since they will be equal.

- E.
Neither the mean nor median. Both will be much lower than the actual average salary.

- 9.A sample of 99 distances has a mean of 24 feet and a median of 24.5 feet. Unfortunately, it has just been discovered that an observation which was erroneously recorded as "30" actually had a value of "35". If we make this correction to the data, then:
- A.
The mean remains the same, but the median is increased.

- B.
The mean and median remain the same.

- C.
The median remains the same, but the mean is increased.

- D.
The mean and median are both increased.

- E.
We do not know how the mean and median are affected without further calculations; but the standard deviation is increased.

- 10.Forty students took a Statistics examination having a maximum of 50 points. The score distribution is given in the following stem-and-leaf plot: 0|28 1|2245 2|01333358889 3|001356679 4|22444466788 5|000 The third quartile of the score distribution is equal to:
- A.
43

- B.
44

- C.
45

- D.
23

- E.
32

- 11.
- A.
95

- B.
76

- C.
26

- D.
190

- E.
None of these

- 12.Which of the following is
*not*a measure of central tendency?- A.
Mean

- B.
Median

- C.
Standard deviation

- 13.Which of the following is a measure of spread?
- A.
Range

- B.
Mode

- C.
Mean

- D.
Median

- 14.A sample consists of four observations: {1, 3, 5, 7}. What is the standard deviation?
- A.
2

- B.
2.24

- C.
6

- D.
6.67

- E.
None of these

- 15.The stemplot below shows the number of hot dogs eaten by contestants in a recent hot dog eating contest. 8 7 6 5 4 3 2 1 1 4 7 2 2 6 0 2 5 7 9 9 5 7 9 7 9 1 Which of the following statements are true? I. The range is 70. II. The median is 46. III. The mean is 60.
- A.
I only

- B.
II only

- C.
III only

- D.
I & II

- E.
I, II, and III

- 16.Consider the boxplot below. 2 4 6 8 10 12 14 16 18 Which of the following statements are true? I. The distribution is skewed right. II. The interquartile range is about 8. III. The median is about 10.
- A.
I only

- B.
II only

- C.
III only

- D.
I & II

- E.
II and III

- 17.Below, the cumulative frequency plot shows height (in inches) of college basketball players. What is the interquartile range?
- A.
3 inches

- B.
6 inches

- C.
25 inches

- D.
50 inches

- E.
None of these

- 18.The mean of the weights of a group of 100 men and women is 160lb. If the number of men in the group is 60 and the mean weight of the men is 180lb, what is the mean weight of the women?
- A.
120 lbs

- B.
125 lbs

- C.
130 lbs

- D.
132 lbs

- E.
135 lbs