Confidence level is 90%, is not known, and the dotplot of IQ scores of 20 randomly
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Confidence level is 90%, σ is not known, and the dotplot of IQ scores of 20 randomly selected statistics instructors is as shown below.
Assume that we want to construct a confidence interval. Do one of the following, as appropriate:
(a) Find the critical value tα/2,
(b) find the critical value zα/2,
(c) state that neither the normal distribution nor the t distribution applies.
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ANSWER You should use the tdistribution to construct the confidence interval because the standard de...View the full answer
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