Scientists collect data on the blood cholesterol levels (milligrams per deciliter of blood) of a random sample of 25 laboratory rats. A 95% confidence interval for the mean blood cholesterol level μ is 80.2 to 89.8. Which of the following would cause the most worry about the validity of this interval?
Statistics Proportion and Mean

Quiz
•
Mathematics
•
12th Grade
•
Hard
Anthony Clark
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
There is a clear outlier in the data
A stemplot of the data shows a mild right skew
You do not know the population standard deviation σ
The population distribution is not exactly Normal.
None of these are a problem when using t-interval
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Many television viewers express doubts about the validity of certain commercials. In an attempt to answer their critics, Timex Group USA wishes to estimate the proportion of consumers who believe what is shown in Timex television commercials. Let p represent the true proportion of consumers who believe what is shown in Timex television commercials. What is the smallest number of consumers that Timex can survey to guarantee a margin of error of 0.05 or less at a 99% confident level?
550
600
650
700
750
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What interval should be used?
2 Sample t interval for means
Paired t interval
Paired t test
1 proportion z interval
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What test should be used?
2 proportion z test
1 proportion z test
2 sample t test for means
1 sample t test for mean
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What interval should be used?
2 Proportion z interval
1 Proportion t interval
1 Proportion z interval
Chi Square for Goodness of Fit
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What test should be used?
2 Sample t test for difference in means
2 proportion z test
Paired t test
1 sample z test
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
As part of a national sleep study, a random sample of adults was selected and surveyed about their physical activity and the number of hours they sleep each night. Of the 183 adults who exercised regularly (exercisers), 59 percent reported sleeping at least seven hours at night. Of the 88 adults who did not exercise regularly (nonexercisers), 52 percent reported sleeping at least seven hours at night. Which of the following is the most appropriate standard error for a confidence interval for the difference in proportions of adults who sleep at least seven hours at night among exercisers and nonexercisers?
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