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- Calculating Z- and T-Test Statistics
“Now that we’ve established a confidence interval,” Randy explained, “we’re now ready to test our hypothesis. Look at the counts we recorded, Jeanette. How many red candies did we find in our 400-count sample? And, what did the FruityTooty company claim would be the population proportion of red candies?”
“There were 92,” said Jeanette, “and the company said the proportion would be 20%.”
“Okay. Then we have enough information to compute the z-test statistic,” said Randy. “Here we go.”
Using the formula and data provided in the problem, the value of the z-test statistic is __________.
Enter your answer as a real number rounded to the hunderths place
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