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Chapter 7: Q.29 (page 429)
An unknown distribution has a mean of and a standard deviation of six. Let = one object from this distribution. What is the sample size if the standard deviation of is ?
The sample size is.
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Find the percentage of sums between 1.5 standard deviations below the mean and one standard deviation above the mean.
Use the information in Example 7.8, but use a sample size of 55 to answer the following questions. a. Find P( x 炉 < 7).
b. Find P(危x > 170).
c. Find the 80th percentile for the mean of 55 scores.
d. Find the 85th percentile for the sum of 55 scores.
An unknown distribution has a mean of and a standard deviation of . A sample size of is drawn randomly from the population.
Find the probability that the sum of the values is greater than .
An unknown distribution has a mean of 25 and a standard deviation of six. Let X = one object from this distribution. What is the sample size if the standard deviation of 危X is 42?
Based on data from the National Health Survey, women between the ages of and have an average systolic blood pressures (in mm Hg) of with a standard deviation of . Systolic blood pressure for women between the ages of to follow a normal distribution.
a. If one woman from this population is randomly selected, find the probability that her systolic blood pressure is greater than
b. Ifwomen from this population are randomly selected, find the probability that their mean systolic blood pressure is greater than .
c. If the sample were four women between the ages ofto and we did not know the original distribution, could the central limit theorem be used?
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