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You want to determine the average number of hours worked by professors at your university per week. You want to be able to express your answer as a confidence interval, with 95% confidence (that is, use z = 1.96) and you are aiming for a precision of plus or minus two hours. Past studies of this type suggest that the variance in professor work hours is about 100 (that is, ?² = 100).
a. How big is the minimum required sample size that would allow you to meet your confidence and precision goals?
b. If you wanted your precision to double (that is, your precision would be plus or minus one hour), how does that affect your minimum required sample size?
c. If you wanted your confidence to increase to 99% (That is, use z = 2.575 instead of 1.96), how does that affect your minimum required sample size?
The data below were obtained for the years 1993 through 1998 and indicate the number of fireworks (in millions) used and the related injuries. Predict the number of injuries (provided there is a significant relationship) if 100 million fireworks a..
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Make a graph to visualize the problem and state, without doing the calculations, whether the p-value of the test
Explain why those rates may be more meaningful as a measure of change across time than the actual numbers of those events.
A survey is being planned to estimate the prevalence of secondary infertility amongst couples aged 20-45. The investigators expect the prevalence to be 10%, and would like to estimate it to within 5% of the true value (with 90% confidence). How many ..
The probability that the daily demand at this store is at least one and at most three is:
A researcher is studying IQ levels. From past experience she knows the population mean IQ for adults is 110 and the standard deviation is 15.
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Farrell Corporation's common stock is $25. The price is expected to increase by $5 over the coming year. The standard deviation of the expected price is $3.
question a police department reports that the probabilities that 0123 and 4 car thefts will be reported in a given day
1.suppose we have a loaded die which gives the outcomes 1 through 6 according to the probability distributionnbspnote
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