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A new drug is being tested for its effectiveness to treat a certain type of infection. It was effective in 119 cases out of 170.
(a) Construct a 95% confidence interval for the rate of effectiveness of the new drug for treating this type of infection.
(b) Without constructing the 98% confidence interval for the rate of effectiveness, would you expect the interval to be longer or shorter compared to the 95% confidence interval? Why?
(c) Construct a 98% confidence interval for the rate of effectiveness of the new drug for treating this type of infection.
High levels of cockpit noise in an aircraft can damage the hearing of pilots who are exposed to this hazard for many hours
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
Does the weight of a vehicle affect the gas mileage? The following random sample was collected where x = weight of a vehicle in hundreds of pounds and y = miles per gallon.
The top 25 companies ranked by market capitalization operating in the washington DC, area along with the year they were founded and the number of employees are given below.
Interpret coefficient on log (salesm). If salesm were to be increased by 20%, what would be estimated change in mktgp? Would this effect be substantive?
The average could be a poor estimate of the spending of all teenagers given that only teenagers in malls were sampled.
Metal stamping machine is producing 10 defective parts per hour. Determine the probability that three or fewer defective parts will be output in a randomly chosen hour, by using the Poisson distribution?
Test, at the 5% level of significance, whether the population standard deviation of hours spent studying is less than 10. Use the Critical value approach.
Make a stem plot for the men height data. Calculate the five-number summary for the women.
Is it reasonable for the manufacturer to claim that the drill bits will last 2.5 hours?
Is there evidence that the population mean amount is different from 8.17 ounces? (Use a 0.05 level of significance.)
At.05 significance level, can we conclude that larger proportion of the agents think the economy is expanding this month?
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