From a population that is not normally distributed and whose standard deviation is not known, a sample of 50 items is selected to develop an interval estimate forµ. Which of the following statements is true??
A. ?The standard normal distribution can be used.
B. ?The t distribution with 50 degrees of freedom must be used.
C. ?The t distribution with 49 degrees of freedom must be used.
D. ?The sample size must be increased in order to develop an interval estimate.
Answer: C
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