WEEK 7: QUIZ
Due Feb 23 at 11:59pm Points 60 Questions 30
Available after Feb 15 at 11:59pm Time Limit 120 Minutes
Allowed Attempts 3
INSTRUCTIONS
Here is some information about your quiz or exam.
This quiz covers Weeks 5 and 6, Chapters 6 and 7, and Course Objectives (COs) 4 and 5.
This quiz has 30 multiple choice questions worth 2 points each for a total value of 60 points.
You have 120 minutes (per attempt) to finish this quiz.
You have three attempts, with the best score used in grading.
When the time limit is reached you will be exited from the exam.
By submitting this work, I am attesting that it abides by the Student Honor Code
(https://devryu.instructure.com/courses/899/pages/student-honor-code) .
TAKE THE QUIZ AGAIN
ATTEMPT HISTORY
Attempt Time Score
KEPT Attempt 1 69 minutes 42 out of 60
LATEST Attempt 2 32 minutes 32 out of 60
Attempt 1 69 minutes 42 out of 60
Score for this attempt: 32 out of 60
Submitted Feb 23 at 4:50pm
This attempt took 32 minutes.
Question 1 pts
, (CO 4) From a random sample of 68 businesses, it is found that the
mean time that employees spend on personal issues each week is 4.9
hours with a standard deviation of 0.35 hours. What is the 95%
confidence interval for the amount of time spent on personal issues?
Correct!
(4.82, 4.98)
(4.71, 5.09)
(4.83, 4.97)
(4.55, 5.25)
See text page 301
Question 2 pts
(CO 4)If a confidence interval is given from 8.50 to 10.25 and the mean
is known to be 9.375, what is the margin of error?
0.438
1.750
Correct!
0.875
8.500
See text page 301
, Question 3 pts
(CO 4) If the population standard deviation of a sample increases
without other changes, what is most likely to happen to the confidence
interval?
cannot determine
does not change
Correct Answer
widens
You Answered narrows
See text page 301
Question 4 pts
(CO 4) From a random sample of 41 teens, it is found that on average
they spend 31.8 hours each week online with a population standard
deviation of 5.91 hours. What is the 90% confidence interval for the
amount of time they spend online each week?
(30.62, 32.99)
(25.89, 37.71)
Correct!
(30.28, 33.32)
(29.99, 33.61)
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