10 Questions
| Attempts: 158

.

Questions and Answers

- 1.A scores from 2012 is listed below. Calculate the sample mean and standard deviation 29, 26, 13, 23, 23, 25, 17, 22, 17, 19, 12, 26, 30, 30, 18, 14, 12, 26, 17, 18
- A.
20.50, 5.79

- B.
20.50, 5.94

- C.
20.85, 5.79

- D.
20.85, 5.94

- 2.Provided that the data above is normally distributed with a mean of 18 and standard deviation of 6, determine the proportion of students with a 33 or higher.
- A.
0.0062

- B.
0.0109

- C.
0.0124

- D.
0.0217

- 3.A sample of 20 observations has a standard deviation of 3. The sum of the squared deviations of observations from the sample mean is
- A.
20

- B.
23

- C.
29

- D.
60

- 4.The inter quartile Range for the AGE Attribute is
- 5.A mother has a child and tells all her friends that he has an IQ of 113 on the XYZ scale and is truly exceptionally intelligent. Given that the mean is 100 and the standard deviation 15 in which band on the graph opposite does he fit in? (one correct choice)
- A.
BAND -A

- B.
BAND -B

- C.
BAND -C

- D.
BAND -D

- E.
BAND -E

- 6.The following list is a set of data ordered from smallest to largest. All values are integers. 2 12 y y y 15 18 18 19 I. The median and the first quartile cannot be equal. II. The mode is 18. III. 2 is an outlier.
- A.
I only

- B.
II only

- C.
III only

- D.
I and III only

- E.
I, II, and III

- 7.The scores of male (M) and female (F) students on a statistics exam are displayed in the following boxplots. The pluses indicate the location of the means. Which of the following is correct?
- A.
The mean grade of the females is about 72.

- B.
About 75% of the males score above 82.

- C.
The median of the male students is about 66.

- D.
The scores of the males have a higher variability than the scores of the females

- E.
About 25% of the females scored above 72.

- 8.A professor scaled (curved) the scores on an exam by multiplying the student’s raw score by 1.2, then adding 15 points. If the mean and standard deviation of the scores before the curve were 51 and 5, respectively, then the mean and standard deviation of the scaled scores are respectively:
- A.
76.2 and 21

- B.
76.2 and 6

- C.
76.2 and 5

- D.
61 and 6

- E.
Cannot be determined without knowing if the scores are normally distributed

- 9.If the largest value of a data set is doubled, which of the following is false?
- A.
The mean increases.

- B.
The standard deviation increases.

- C.
The interquartile range increases.

- D.
The range increases.

- 10.The nominal level of measurement is represented in which variable below?
- A.
Fear of crime

- B.
Gender

- C.
Temperature

- D.
income

×

Wait!

Here's an interesting quiz for you.