A Simple Random Sample of Kitchen Toasters Is to Be $\sigma = 20$

question 90

Multiple Choice

A simple random sample of kitchen toasters is to be taken to determine the mean operational lifetime in hours. Assume that the lifetimes are normally distributed with population standard deviation $\sigma = 20$ hours.
Find the sample size needed so that a $98 \%$ confidence interval for the mean lifetime will have a margin of error of 8 .

• A) 117
• B) 5
• C) 6
• D) 34

Recognize the relationship between gender and pet ownership.

Understand how to evaluate nominal variables using specific statistical tables.

Understand the concept of colorblind ideology as a form of racism.

Recognize the difference between symbolic ethnicity and enforced racial identity.

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