Business, 10.03.2020 04:30 Maria3737

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 for mean. Which of the following statements are 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

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