Question

5. The mean IQ score of a sample of 71 students selected from a high school is 85. Suppose the standard deviation of IQ's at this school is σ = 8.8. The 99% confidence interval for the population mean (rounded to two decimal places) is: 10. A researcher wants to estimate the mean age of all Business Week readers at a 99% confidence level. She wants the margin of error to be within 2.1 years of the population mean. The standard deviation of ages of all Business Week readers is 8.06 years. The sample size that will yield a margin of error within 2.1 of the population mean is: 12. A company wants to estimate, at a 95% confidence level, the proportion of all families who own its product. The most conservative estimate of the sample size that would limit the margin of error to be within 0.063 of the population proportion is: 13. In a random sample of 53 items produced by a machine, the quality control staff found 16 of them to be defective. Calculate the point estimate of the population proportion of defective items. Round to 4 decimal places.

          5. The mean IQ score of a sample of 71 students selected
from a high school is 85. Suppose the standard deviation of IQ's at
this school is σ = 8.8. The 99% confidence
interval for the population mean (rounded to two decimal places)
is:
10. A researcher wants to estimate the mean age of
all Business Week readers at a 99% confidence
level. She wants the margin of error to be within 2.1 years of the
population mean. The standard deviation of ages of
all Business Week readers is 8.06 years. The
sample size that will yield a margin of error within 2.1 of the
population mean is:
12. A company wants to estimate, at a 95% confidence level, the
proportion of all families who own its product. The most
conservative estimate of the sample size that would limit the
margin of error to be within 0.063 of the population proportion
is:
13. In a random sample of 53 items produced by a machine, the
quality control staff found 16 of them to be defective. Calculate
the point estimate of the population proportion of defective items.
Round to 4 decimal places.

Added by Jonathan W.

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