1. Introductory Statistics: Exploring the World through Data, 1e
Active Learning Lecture Slides
For use with Classroom Response Systems
Introductory Statistics:
Exploring the World through Data, 1e
by Gould and Ryan
Sections Inferring Population Means
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2. The t-distributions are
symmetric
unimodal
“bell-shaped”
all of the above
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3. Compared to the z-distribution, the t-distribution has
thinner tails
thicker tails
taller peaks
more peaks
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4. The t-distribution’s shape depends on only one parameter, called the
mean
standard deviation
degrees of freedom
all of the above
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5. © 2013 Pearson Education, Inc.
True or False Ultimately, when df is infinitely large, the t-distribution is exactly the same as the N(0, 1) distribution.
True
False
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6. © 2013 Pearson Education, Inc.
True or False A confidence interval can be interpreted as a range of plausible values for the population parameter.
True
False
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7. © 2013 Pearson Education, Inc.
True or False The confidence level is a measure of how well the method used to produce the confidence interval performs.
True
False
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8. © 2013 Pearson Education, Inc.
Which of the following are way(s) in which we can report a confidence interval?
(lower boundary, upper boundary)
Estimate ± margin of error
Mean ± standard deviation
both A and B above
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9. © 2013 Pearson Education, Inc.
True or False Hypotheses are always statements about population statistics.
True
False
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10. © 2013 Pearson Education, Inc.
True or False In hypothesis testing, values of the t-statistic that are far from 0 tend to discredit the null hypothesis.
True
False
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11. © 2013 Pearson Education, Inc.
True or False The p-value tells us the probability that we would get a t-statistic as extreme as or more extreme than what we observed.
True
False
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12. © 2013 Pearson Education, Inc.
There are three basic pairs of hypotheses. The two-tailed one-sample t-test has the following hypotheses:
H0: μ = μ0 and Ha: μ < μ0
H0: μ = μ0 and Ha: μ ≠ μ0
H0: μ = μ0 and Ha: μ > μ0
H0: μ ≠ μ0 and Ha: μ = μ0
© 2013 Pearson Education, Inc.