Chapter 3

Given the following data set, find the value that corresponds to the 75th percentile. 10, 44, 15, 23, 14, 18, 72, 56

50

Find the weighted mean for three exams if the first one was worth 75 points and the student received a square 70% the second was worth 50 points and the student received a score of 80 and the third was worth 30 points in the student received a score of 95

78

find Q^1,Q^2,Q^3 for the following data set. 7, 21, 32, 38. A). Q^1=14, Q^2=26.5, Q^3=35 B). Q^1=10, Q^2=25, Q^3=36 C). Q^1=5, Q^2=20, Q^3=39 D). Q^1=14, Q^2=25, Q^3=25

A). Q^1=14, Q^2=26.5, Q^3=35

What is the midrange of the following numbers? 7, 13, 12, 14, 6, 14, 20, 20, 20 A. 13 B. 14 C. 7 D. 20

A. 13

A normal distribution in which approximately 68% of the data values fall within one standard deviation of the mean behaves according to A. The empirical rule. B. Asymmetrical distribution. C. A box plot. D. Differential statistics.

A. The empirical rule.

Find the z score for each student and indicate which one is higher. Art Major X=46, X=50, S=5 Theater major X=70, X=75, S=7 A)The art major has a higher score than the theater major. B)The theater major has a higher score than the art major. C)Both students have the same score. D)Neither student received a positive score; therefore, the higher score cannot be determined.

B)The theater major has a higher score than the art major.

Find the mode for the number of police officers in selected city districts. 24, 26, 24, 30, 23, 28, 19, 31, 24, 26, 19 A) 23 B) 24 C) 26 D) 28

B. 24

Which of the following is the correct mean for the given data? 7, 8, 23, 9, 10, 11 A. 10 B. 9.7 C. 9.67 D. 9

B. 9.7

In a unimodal, symmetrical distribution as shown in the figure below. A. The mean is the same as the median, but the mode can be different. B. The mean, the median, and the mode are the same. C. The median in the mode are the same, but the mean can be different. D. The mean, the median, and the mode are different.

B. The mean, the median, and the mode are the same.

If a student scored 70 points on a test where the mean score was 78 and the standard deviation was 6. The student's z-score was A. 13.00 B. 0.22 C. -0.22 D. -1.33

D. -1.33

According to chebyshev's theorem the proportion of values from a data set that is further than two standard deviations from the mean is A. 0.50 B. 0.13 C. 1.00 D. 0.25

D. 0.25

If a student scored 86 points on a test where the mean score was 80 and the standard deviation was 3. The student's z-score was A. 26.67 B. 28.67 C. 0.67 D. 2.00

D. 2.00

Determine the range for this data 4, 7, 3, 16, 5, 22, 8 A. 4 B. 3 C. 14 D. 19

D.19

Choose the correct statement describing the following stem and leaf plot for the grades on a linear algebra exam a) the range of the grades is between 23 and 98. b) Of the 29 students who took the exam, 9 scored between 80 and 89. c) There are no gaps in the data. d) The data is bimodal.

b) Of the 29 students who took the exam, 9 scored between 80 and 89.

Find the median for the following data 6, 7, 4, 5, 3, 7, 4 A) 3 b. 4 c.5 d.7

c.5