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You have obtained the number of years of education from one random sample of 38 police officers from City A and the number of years of education from a second random sample of 30 police officers from City B. The average years of education for the sample from City A is 15 years with a standard deviation of 2 years. The average years of education for the sample from City B is 14 years with a standard deviation of 2.5 years. Is there a statistically significant difference between the education levels of police officers in City A and City B?
A purchasing agent for a national chain of seafood restaurants wants to estimate the mean weight of shrimp in a large catch. How many shrimp should be sampled from the catch to be 95% confident that the sample mean will be off from the actual mean we..
1. a professor at a loca community noted that the grades of hi s students were normally distrubuted with a mean of 74
Each contact will result in either no sale or a $50,000 sale, with the probabilities .9 and .1, respectively. Give the probability distribution for daily sales. Find the mean and standard deviation of the daily sales.
HIV found that 3 received a false positive test result. Test the researcher's claim of a 2% false positive rate at the a = 0.05 level. What can you conclude?
Find out whether or not right-hemisphere damage results in significantly reduced performance on spatial skills task. Test with alpha set at .05 with one tail.
A company is interested in estimating μ, mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
Suppose that $126,000 is to be allocated for advertising, research, and investment in the ratio 10:4:2. How much money will be allocated for each?
Under what circumatances do you use a one-sided confidence interval instead of a 2 sided confidence interval?
a sample of 21 of 180 funded projects revealed that 19 were valued at 17680 each and 2 were valued at 20320 each. from
an internet server conducted a survey of 400 of its customers and found that the average amount of time spent online
the u.s. air force has designed a missile detection system which will detect 19 out of 20 incoming missiles. if one
what does p .05 mean? what are some misconceptions about the meaning of p .05? why are they wrong? should all
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