It Is Desired to Estimate the Average Time It Takes

question 88

Multiple Choice

It is desired to estimate the average time it takes Statistics students to finish a computer project to within two hours at 90% reliability. It is estimated that the standard deviation of the times is 14
Hours. How large a sample should be taken to get the desired interval?

• A)n = 133
• B)n = 325
• C)n = 189
• D)n = 231

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Definitions:

Significance Level

The risk set by the researcher for rejecting a null hypothesis when it is true.

Obtained Value

The value that results from the application of a statistical test.

Fisher's Exact Test

A statistical significance test used for small sample sizes, analyzing the association between two categorical variables.

2 × 2 Table

A contingency table with two rows and two columns used to display the frequency distribution of variables' combinations.