Confidence Interval for Means

Quiz
•
Mathematics
•
12th Grade
•
Hard
Anthony Clark
FREE Resource
15 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A 90% confidence interval for the mean speed driven by cars on East Main St. is given by (21, 45). What was the margin of error of this study?
12
24
33
None of these.
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A sample of 20 cupcakes found the interval for calories to be (150, 350). Which is the correct interpretation of the 95% confidence interval?
We are 95% confident that the true mean calorie content can be found with a sample of 150 to 350 cupcakes.
We are 95% confident that the true mean calorie content in cupcakes is between 150 and 350 calories.
We are 95% confident that a sample of 20 cupcakes will find 250 calories per cupcake.
None of these are correct.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In a crash test of 15 troopers, collision repair costs are found to have a distribution that is approximately normal, with a mean of $1800 and a standard deviation of $950. Construct a 99% confidence interval for the repair cost.
(1070, 2530)
(1273, 2326)
(1799, 1801)
None of these.
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
The 90% interval for a statistics test was given by 72 +- 7. What is the lower bound for the interval?
7
72
65
79
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A 90% confidence interval for the mean speed driven by cars on East Main St. is given by (21, 45). What was the sample mean of this study?
12
24
33
None of these.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Find the t* value for a 99% confidence interval with a sample of 23 people.
1.714
1.711
2.064
None of these.
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
I randomly select 25 students’ Math SAT scores and find the mean to be 600. I know the standard deviation of the population is 50. Find a 95% Confidence Interval.
95% confident the sample mean is between 580.4 and 619.6
95% confident the population mean is between 583.55 and 616.45
95% confident the population mean is between 579.36 and 620.64
95% confident the population mean is between 574.2 and 625.8
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