AP Stats Unit 8
Authored by Barbara White
Mathematics
9th - 12th Grade
Used 3+ times
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14 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
Another word for average is
sample
mean
data
numerical data
2.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
To test a claim about a mean, when the population standard deviation is unknown we use:
z procedures
Pythagorean Theorem
t procedures
np > 10 and n(1-p) > 10
3.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
What does it mean when a test is statistically significant?
it has reached alpha level status
the test statistic had a P-value higher than the alpha level
the test statistic had a P-value lower than the alpha level
it is important in practical terms
4.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
A tire manufacturer claims that one particular type of tire will last at least 50,000 miles. A group of angry customers does not believe this is so. They take a sample of 14 tires to test if the mean mileage of the tires is really less than 50,000.
What set of hypotheses are they interested in testing?
a) H0: μ = 50,000 vs. Ha: μ < 50,000
b)H0: x̅ = 50,000 vs. Ha: x̅ < 50,000
c)H0: μ = 50,000 vs. Ha: μ ≠ 50,000
d)H0: μ = 50,000 vs. Ha: μ > 50,000
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
A tire manufacturer claims that one particular type of tire will last at least 50,000 miles. A group of angry customers does not believe this is so. They took a sample of 14 tires to test if the mean mileage of the tires is really less than 50,000.
If 0.0100 < P-value < 0.0200, what decision should be made if testing at the α = 0.05 level?
a)Reject H0 and conclude that the tires were not performing as claimed.
b)Reject H0 and conclude that the mean tire life really is 50,000 miles.
c)Do not reject H0 and conclude that the tires were not performing as claimed.
d)Do not reject H0 and conclude that the mean tire life really is 50,000 miles.
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Simple random samples are taken from two large populations, designated Population 1 and Population 2. Which of the following describes a situation in which the conditions for performing a two-sample t-test for the difference of two means for these populations have not been satisfied?
n1 = 15, n2 = 100. The distribution of Sample 1 is symmetric and unimodal with no outliers, and the distribution of sample 2 is skewed left.
n1 = 15, n2 = 15. The distributions of both samples are symmetric and unimodal with no outliers.
n1 = 15, n2 = 15. The distribution of Sample 1 is symmetric and unimodal with no outliers, and the distribution of Sample 2 is skewed left with no outliers.
Sample size is irrelevant in
T-procedures.
T-procedures.
7.
MULTIPLE CHOICE QUESTION
5 mins • 1 pt
A medical researcher measured the pulse rates (beats per minute) of randomly selected adults and found the following t-based confidence interval:
With 90.00% Confidence,
71.12512 < μ(Pulse) < 73.28914
What is the correct interpretation of the t-interval?
A) We are 90% confident that the true, population mean of pulse rates is between 71.12512 and 73.28914 beats per minute.
B) We are 90% confident that the true, population proportion of pulse rates is between 71.12512 and
73.28914 beats per minute.
73.28914 beats per minute.
C) We are 90% confident that the sample proportion of pulse rates is between 71.12512 and 73.28914
beats per minute.
beats per minute.
D) We are 90% confident that the sample mean of pulse rates is between 71.12512 and 73.28914 beats
per minute.
per minute.
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