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Of the 460 respondents in a Christmas tree market survey, 41% had no children at home and 59% had at least one child at home. The corresponding figures for the most recent census are 48% with no children and 52% with at least one child. Test the null hypothesis that the telephone survey technique has a probability of selecting a household with no children that is equal to the value obtained by the census. Give the z statistic (rounded to two decimal places) and the P-value. What do you conclude? (Use (alpha) = 0.10.) z = ? P-value =?
Choose a variable (such as number of daily admissions at a local theater or number of miles students have to commute daily to get to their college.) Before collecting the data, decide what a likely average might be, then complete the following:
An election coming up next week promises to be very close. In fact, assume that 50% are in favor and 50% are against. Suppose you conduct a poll of 791 randomly selected likey votes. Approx. how different will the percent in favor (from the poll) ..
What is the probability that in January of 2003 a randomly selected worker spent fewer than 50 hours per month logged on to the Internet?
Is spine bone density is normally distributed in young women with a mean of 1.0 g/cm 2 and a standard deviation of .10 g/cm 2 , then how many young women out of 100 would you expect to have bone densities less than .85 g/cm 2 ?
Construct a 99% confidence interval estimate of the population proportion of accounts that would purchase the additional line if the handset were free.
Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean (to 2 decimals).
The management at Black Angus is considering hiring 8 additional servers. Currently 12 servers are serving 4 tables each per hour. Servers make $11.25 on overtime per hour.
The probability I'll jog today is 0.90 and the probability you'll jog tonight is 0.30. Find the probability:
Compute the probability of exactly 0,1,2,3,4, and 5 arrivals per day.
he length of time a person spends waiting in a physician's office for an appointment can be a frustrating experience. The results below are the responses of internists from two multispecialty group practices to the following question:
Determine the mean and standard error of the x - bar distribution.
To give 98% confidence interval for population mean μ, you would use critical value.
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