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ECON 338/ENVR 305 CLICKER QUESTIONS Statistics – Question Set #4 (from Chapter6)

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As the sample size of a random sample increases, the mean of the sample mean _____. 1. remains the same 2. increases 3. decreases 4. becomes less accurate 5. cannot be determined from the above information Response Counter

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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. 1. 3.5 2. 0.35 3. 35 4. 3.05 5. 1.11 Response Counter

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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. 1. 1.07 2. 0.00 3. 1.00 4. 0.038 5. 0.962 Response Counter

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