The t-distribution is used to construct confidence interval for the population mean 
when the population is unknown and the sample size is small.
Correct Answer:
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Q186: If a sample has 15 observations and
Q187: A random sample of size 10 produced
Q188: If a sample has 18 observations and
Q189: The t-distribution approaches the normal distribution as
Q190: A random sample of size 10 produced
Q192: Student's t-distribution is a sampling distribution for
Q193: In order to determine the p-value associated
Q194: The "shape" of the t-distribution changes as
Q195: If a sample has 15 observations and
Q196: A race car driver tested his car
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