Statistics – Question Set #4 (from Chapter6)

As the sample size of a random sample increases, the mean of the sample mean _____.
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remains the same increases decreases becomes less accurate cannot be determined from the above information
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The mean and the standard deviation of a normally distributed population is 30.5 and 3.5, respectively. Find the standard deviation of the sample mean for a sample size of 10.
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3.5
0.35
35
3.05
1.11
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A school district is assumed to have 8,000 5th graders. The average weight of a 5th grader is 75 pounds, with a standard deviation of 20 pounds. If a random sample of 50 students is drawn, find the probability that the average weight of a student from the drawn sample will be less than
70 pounds.
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1.07
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1.00
0.038
0.962
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