
Understanding Confidence Intervals and Sample Size

Interactive Video
•
Mathematics, Science, Business
•
10th - 12th Grade
•
Hard

Ethan Morris
FREE Resource
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10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the desired margin of error for Nadia's confidence interval?
15 kilometers
5 kilometers
10 kilometers
20 kilometers
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Why is it challenging to determine the sample size using the t-statistic?
Because the population mean is unknown
Because the standard deviation is too large
Because the degrees of freedom depend on the sample size
Because the confidence level is too high
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What alternative method is suggested for constructing a confidence interval?
Using the chi-square distribution
Using the z-score
Using the F-distribution
Using the binomial distribution
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What standard deviation value is used from the pilot study?
10 kilometers
18 kilometers
12 kilometers
15 kilometers
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which function is used to calculate the z-score for a 90% confidence interval?
Normal distribution
Inverse norm
Standard deviation
Mean calculation
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the approximate z-score value for a 90% confidence interval?
2.33
1.28
1.96
1.645
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the first step in solving for the sample size algebraically?
Multiply both sides by the z-score
Divide both sides by the z-score and standard deviation
Add the z-score to both sides
Subtract the z-score from both sides
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