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The tdf distribution has broader tails than the z distribution.

A) True
B) False

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Suppose we wish to find the required sample size to find a 90% confidence interval for the population proportion with the desired margin of error.If there is no rough estimate Suppose we wish to find the required sample size to find a 90% confidence interval for the population proportion with the desired margin of error.If there is no rough estimate   of the population proportion,what value should be assumed for   ? A)  0.05 B)  0.10 C)  0.50 D)  0.90 of the population proportion,what value should be assumed for Suppose we wish to find the required sample size to find a 90% confidence interval for the population proportion with the desired margin of error.If there is no rough estimate   of the population proportion,what value should be assumed for   ? A)  0.05 B)  0.10 C)  0.50 D)  0.90 ?


A) 0.05
B) 0.10
C) 0.50
D) 0.90

E) None of the above
F) A) and C)

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We draw a random sample of size 25 from the normal population with variance 2.4.If the sample mean is 12.5,what is a 99% confidence interval for the population mean?


A) [11.2600,13.7400]
B) [11.3835,13.6165]
C) [11.7019,13.2981]
D) [11.7793,13.2207]

E) A) and D)
F) B) and D)

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