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A series of exercises and examples related to confidence intervals in statistics. It covers various scenarios, including estimating population means and proportions, and determining sample sizes. Useful for students learning about confidence intervals and their applications in data analysis.
Typology: Quizzes
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1 Suppose a random sample of 400 is selected from a
Confidence Interval for μ
Confidence Level
n Mean StDev
Use t or z?
t-value Margin of
Error Lower Limit Upper
Limit
2 The point estimate of the population mean is
3 Suppose a random sample of 50 is drawn from a po
Confidence Interval for μ
Confidence Level
n Mean StDev
Use t or z?
t
t
t-value
Margin of Error
Lower Limit
Upper Limit
4 Suppose a researcher is
interested in understanding
Confidence Interval for μ
Confidence Level
n Mean StDev
Use t or z?
t-value Margin of
Error Lower Limit Upper
Limit
5 Brian Vanecek, VP of Operations at Portland Trust B
Confidence Interval for μ
Confidence Level
n Mean StDev
Use t or z?
t
t
Sample Proportion
Sample Proportion
z
Margin of Error
Lower Limit
Upper Limit
8 A researcher is interested in estimating the mean w
Confidence Interval for μ
Confidence Level
n
Mean
StDev
Use t or z?
t-value
Margin of Error
Lower Limit
Upper Limit
9 Life tests performed on a sample of 13 batteries of a
Confidence Interval for μ
t
Confidence Level
n
Mean
StDev
Use t or z?
t-value
Margin of Error
Lower Limit
Upper Limit
10 Suppose you want to estimate a population
Minimum Sample Size p
Confidence Level
Proportion
Error
z-Value
Minimum Sample Size
mean c
3.84 x 0.
11 Construct 90%, 95%, and 99% confidence intervals t
t
Upper Limit
13 A large trucking company wants to estimate the pro
Confidence Interval for p
Confidence Level
n
Number of Successes
Sample Proportion
Sample Proportion
z
Margin of Error
Lower Limit
Upper Limit
0.25 to
14 Is the environment a major issue with Americans? T
Confidence Interval for p
The poi
Confidence Level
n
Number of
Successes
Sample Proportion
Sample Proportion (^) 0.
population with a standard deviation of 5. If the sample m
24.42 and 25.
the sample mean
pulation whose standard deviation is unknown. If the samp
68.76 and 71.
the variation in the price of store brand milk. A random sa
$3.06 to $3.
ank, is evaluating the service level provided to walk-in custo
14.18 to 15.
eight of a semi tracker truck to determine the potential loa
19,365 to 20,
new model indicated: (1) an average life of 75 months, an
71.28 to 78.
orrect to within 0.25 with probability equal to 0.95. You do
estimate μ from the following data. State the point estim
ion mean will be estimated using a 92% confidence interval
a lifetime of batteries produced by a certain method will b
Size μ
mple of 36 grocery stores selected from a population a
mers. Accordingly, his staff recorded the waiting times
rograms of AFB banks. His staff randomly selected per
ed its website prior to visiting the store. Based on this
