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Assume a study revealed that from a sample of 80 working women in a metropolitan area, 12 were over the age of 60.
(a) Construct a 99% confidence interval for the true proportion of working women over the age of 60 in the metropolitan area.
(b) Give the margin of error E for the 99% confidence interval.
Using the menu systems, request descriptive statistics (mean, s.d. and variance) for both your original variables
A researcher conductued a study of the access speed of 35 hard drives and concluded that his maximum error of estimate was 35. If he were to conduct a second study to reduce the maximum error of estimate to 7, about how many hard drives should he ..
question 1 a usa today snapshot states that the government claims that there is a significant difference in the mean
If the scenario in (a) is possible, is it a special case of Simpson's paradox, equivalent to Simpson's paradox, or neither?
Some television stations attempt to gauge public opinions by posing a question on the air and asking viewers to call to give their opinions.
Suppose that two drugs are both effective in prolonging length of life after a heart attack. Substantial statistical evidence indicates that the mean life.
In a study to compare the perceived effects of two pain relievers, 200 randomly selected adults were given the first pain reliever, and 93% indicated appreciable pain relief. Of the 450 individuals given the other pain reliever, 96% indicated expe..
a drug is assumed to be e?ective with an unknown probability p. to estimate p the drug is given to n patients. it is
She believes that the chances of all 7 of the stocks being large cap must be very low. Compute the probability of all 7 being large cap.
a. What annual rate of return did the investor earn? b. Use the CPI information from the previous exercise to compute the inflation rate for 2009.
the marketing manager of a large supermarket chain faced the business problem of determining the effect on the sales of
Comparing the experimental and theoretical probabilities, can you say the die used in this experiment is a fair die? Why or why not?
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