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A competency test has scores with a mean of 69 and a standard deviation of 4. A histogram of the data shows that the distribution is normal. Use the Empirical Rule to find the percentage of scores between 61 and 77.
50%
95%
77%
99.7%
68%
Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the time? Why or why not?
Sample data drawn independently from normally distributed populations
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A study of long-distance phone calls made from the corporate offices of General Electric revealed the length of the calls, in minutes, follows the normal probability distribution. The mean length of time per call was 5.2 minutes and the standard ..
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