Under what conditions can we not use the normal


(a) Under what conditions can we not use the normal distribution but can use the t distribution to ?nd con?dence intervals for the unknown population mean?

(b) What is the relationship between the t distribution and the standard normal distribution? (c) What is the relationship between the z and t statistics for the theoretical sampling distribution of the mean? (d) What is meant by degrees of freedom?

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Basic Statistics: Under what conditions can we not use the normal
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