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Suppose a manufactuirng company make a certain item. The time to produce each item is normally distributed around a mean of 27 minutes with a SD of 2.5 minutes. Thus, the population of production time is normal in shape. Find the mean and standard deviation (SD) of the sample. Please show all steps
To determine monthly rental prices of apartment units in San Francisco Bay area, samples were constructed in the following ways. Identify the technique used to produce each sample.
Explain why those rates may be more meaningful as a measure of change across time than the actual numbers of those events.
The average number of miles that 90 truckers drove in a day was 540.0 with a standard deviation of 40 miles. What is the 99% confidence interval of the true mean number of miles driven by all truckers?
Calculate the arithmetic mean age of the uninsured senior citizens to the nearest hundredth of a year. Identify the median age of the uninsured senior citizens
Nicotine patches are often used to help smokers quit. Does giving medicine to fight depression also help? A randomized double blind experiment assigned 244 smokers to receive nicotine patches and another 245 to receive both a patch and the antidep..
Political polls typically sample randomly from the U.S population to investigate the percentage of voters who favor some candidate or issue. The number of people polled is usually on the order of 1000.
When 338 college students are randomly selected and surveyed, it is found that 109 own a car. Find a 99% confidence for the true proportion of all college students who own a car.
Find the probability and mean and standard deviation for given data under Binomial distribution.
Find out sample size needed to be 95 percent confident that, sample proportion of U.K. annual report graphics which are distorted, is within margin of error of .03 of p.
If a 99% confidence interval is calculated to estimate the difference between the average hourly rates for each type of graduate, what is the margin of error? Assume both population standard deviations are equal.
What is the minimal number of days a person must watch to be at least 96.8% sure of seeing one or more hawks migrating?
What is the expected number of contracts that it will win? What is the expected profit for each contract? What is the company's expected total profit on these three bids?
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