
Confidence Intervals and Sample Proportions

Interactive Video
•
Mathematics
•
10th - 12th Grade
•
Hard

Thomas White
FREE Resource
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9 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the focus of the video tutorial?
Confidence intervals for proportions
Confidence intervals for means
Standard deviation calculations
Sample size determination
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does x̄ represent in statistics?
Variance
Standard deviation
Sample mean
Population mean
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which symbol represents the sample proportion?
P
P hat
Q
Q hat
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In the example problem, how many nursing applications were sampled?
5,000
50
500
60
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the decimal value of the sample proportion P hat in the example?
0.25
0.88
0.12
0.06
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What does Q hat represent in the context of the example?
Population mean
Proportion of male applicants
Proportion of non-male applicants
Sample mean
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formula for the confidence interval of a sample proportion?
P hat ± z * (σ/√n)
P hat ± z * √(P hat * Q hat / n)
x̄ ± z * (σ/√n)
x̄ ± z * √(P hat * Q hat / n)
8.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What z-score is used for a 90% confidence interval?
1.28
1.96
2.33
1.645
9.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the range of the confidence interval for male applicants in the example?
0.12 to 0.24
0.096 to 0.144
0.06 to 0.18
0.10 to 0.15
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