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# z-score and 90% confidence interval

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1. The average hourly wage of workers at a fast food restaurant is \$7.85 with a standard deviation of \$0.35. Find the z value for each of the following pay rates.

a. \$8.00
b. \$7.50

2. A sample of 60 faculty members at a large university found that their average taxes were \$500 a month, with a sample standard deviation of \$35. What is the 90% confidence interval of the average taxes of all faculty members at the university?

##### Solution Summary

The solution first shows how to calculate the z-score. It also shows how to construct the 90% confidence interval in detail.

##### Solution Preview

The average hourly wage of workers at a fast food restaurant is \$7.85 with a standard deviation of \$0.35. Find the z value for each of the following pay rates.

1. \$8.00

2. \$7.50

A sample of ...

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This quiz covers basic terms and definitions of statistics.

##### Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.