Math 1140 - Introduction to Statistics » Summer 2021 » Quiz 2 Chapter 2 and 3

Need help with your exam preparation?

Existing Quiz Clients Login here
Question #1
Solve the problem. Round results to the nearest hundredth. The mean of a set of data is 4.11 and its standard deviation is 3.03. Find the z score for a value of 10.86.
A.   2.23
B.   2.01
C.   2.45
D.   2.53
Question #2
Find the standard deviation for the given sample data. Round your answer to one more decimal place than the original data. 18 18 18 9 15 5 10 5 15
A.   5.1
B.   1.6
C.   5.8
D.   5.4
Question #3
Find the midrange for the given sample data. 49 52 52 52 74 67 55 55
A.   25
B.   12.5
C.   53.5
D.   61.5
Question #4
Find the median for the given sample data. The temperatures (in degrees Fahrenheit) in 7 different cities on New Year's Day are listed below. 25 25 31 53 64 73 83 Find the median temperature.
A.   53°F
B.   51°F
C.   64°F
D.   31°F
Question #5
Find the variance for the given sample data. Round your answer to one more decimal place than the original data. 77 2 5 1
A.   11.8
B.   7.7
C.   7.8
D.   6.2
Question #6
If your score on your next statistics test is converted to a z score, which of these z scores would you prefer?
A.   -2
B.   2
C.   -1
D.   0
Question #7
Provide an appropriate response. The frequency distribution below summarizes employee years of service for Alpha Corporation. Determine the width of each class. Years of service / Frequency 1-5/ 5 6-10/ 20 11-15/ 25 16-20/ 10 21-25/ 5 26-30/ 3
A.   5
B.   6
C.   10
D.   4
Question #8
Provide an appropriate response. The following frequency distribution analyzes the scores on a math test. Find the class midpoint of scores interval 40-59. Scores / Number of students 40-59 / 2 60-75 / 4 76-82 / 6 83-94 / 15 95-99 / 5
A.   49
B.   48.5
C.   49.5
D.   50.5

Need help with your exam preparation?

Existing Quiz Clients Login here