MATH 120 WEEK 7 EXAM | 2026 QUESTIONS
AND ANSWERS WITH THOROUGH SOLUTIONS
– NEWLY UPDATED SUCCESS GUIDE–AMU.
View answer
1.
What is the impact of changing from the 90% confidence interval to the
99% confidence interval?
The range of values included increases.
The range of values included decreases.
The range of values included stays the same.
It cannot be determined from the information provided.
View answer 2.
What does decreasing the standard deviation of the sample do to the
confidence interval?
The range of values included increases.
The range of values included decreases.
The range of values included stays the same.
It cannot be determined from the information provided.
View answer 3.
What is the impact of decreasing the sample size?
The range of values included increases.
The range of values included decreases.
The range of values included stays the same.
, It cannot be determined from the information provided.
View answer
4.
Which accurately describes widening the range of the confidence
interval (by changing the confidence level)?
The range is wider so there is more precision.
The range is wider so there is less precision.
The range is wider so the certainty is higher.
The range is wider so the certainty is lower.
View answer
5.
A delivery company provides expected time of arrival. The company
wants to provide an accurate suggestion with a 90% confidence level. If
the sample size is 50, the sample average is 35 minutes, the standard
deviation is 10 minutes, and the z-score is 1.65, what is the standard
error of the mean?
1.16
1.41
2.33
3.73
View answer
6.
A delivery company provides expected time of arrival. The company
wants to provide an accurate suggestion with a 90% confidence level. If
the sample size is 50, the sample average is 35 minutes, the standard
deviation is 10 minutes, and the z-score is 1.65, what is the margin of
error?
1.16
1.41
AND ANSWERS WITH THOROUGH SOLUTIONS
– NEWLY UPDATED SUCCESS GUIDE–AMU.
View answer
1.
What is the impact of changing from the 90% confidence interval to the
99% confidence interval?
The range of values included increases.
The range of values included decreases.
The range of values included stays the same.
It cannot be determined from the information provided.
View answer 2.
What does decreasing the standard deviation of the sample do to the
confidence interval?
The range of values included increases.
The range of values included decreases.
The range of values included stays the same.
It cannot be determined from the information provided.
View answer 3.
What is the impact of decreasing the sample size?
The range of values included increases.
The range of values included decreases.
The range of values included stays the same.
, It cannot be determined from the information provided.
View answer
4.
Which accurately describes widening the range of the confidence
interval (by changing the confidence level)?
The range is wider so there is more precision.
The range is wider so there is less precision.
The range is wider so the certainty is higher.
The range is wider so the certainty is lower.
View answer
5.
A delivery company provides expected time of arrival. The company
wants to provide an accurate suggestion with a 90% confidence level. If
the sample size is 50, the sample average is 35 minutes, the standard
deviation is 10 minutes, and the z-score is 1.65, what is the standard
error of the mean?
1.16
1.41
2.33
3.73
View answer
6.
A delivery company provides expected time of arrival. The company
wants to provide an accurate suggestion with a 90% confidence level. If
the sample size is 50, the sample average is 35 minutes, the standard
deviation is 10 minutes, and the z-score is 1.65, what is the margin of
error?
1.16
1.41
