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    Current learning objective: Calculating the Sample Size n
    Question 7
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Score: 1.47 of 5 points
Suppose that an accounting firm does a study to determine the time needed to complete one person’s tax forms. It randomly surveys 64 people. The sample mean is 26.75 hours. There is a known standard deviation of 4.75 hours. The population distribution is assumed to be normal.
a. Find the following values. (Enter exact answers)
i. 64
ii. 26.75
iii. 4.75

Ask by Nunez Gross. in the United States
Mar 29,2025

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ii. \
iii.

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Bonus Knowledge

When calculating sample statistics, it’s important to remember that the sample mean ( ) represents the average value of the sampled data. In this case, is reported as 26.75 hours, which reflects the average time individuals took to complete tax forms from the 64 surveyed.
For the standard deviation ( ), this measures the spread of data points around the mean. Since it’s known to be 4.75 hours, this indicates that while the average time is 26.75 hours, there’s some variability in how long different individuals took. Thus, make sure to keep track of these values as you analyze the data!

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