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Given a sampling distribution of a sample mean X bar that is normally distributed and has a mean of 30 and a standard deviation of 8, a sample mean of 40 corresponds to:
A. a z value of -1.25
B. a z value of +1.25
C. a sample size of 120
D. a sample size of 300
If a random sample of 40 customers is taken, what is the probability that the sample average expenditure per customer for this sample will be 87.00 or more?
one sample has n 8 and ss 21 and a second sample has n 8 and ss 35. what is the pooled variance for the two
find the area under the standard normal curve for the followinga pz gt 1.15b p0 lt z lt 1.58c p-1.06 lt z lt
Explain why a strong correlation would be found between weekly sales of firewood and weekly sales of cough drops over a 1-year period. Does the strong correlation mean that one variable causes the other?
in a study of 750 randomly selected medical malpractice suits it is found that 452 of them were dropped or dismissed.1.
A certain state lottery awards 418 prizes; 28-$200 prizes, 120-$25 prizes and 270-$20 prizes, for every 10,000 tickets sold.
a local eat-in pizza restaurant wants to investigate the possibility of starting to deliver pizzas. the owner of the
A cereal manufacturer sells boxes of cereal that list the weight as 19 oz. A random sample of 60 boxes was taken, with the contents carefully weighed.
What is the 99% confidence interval for the true proportion of all e-mail subscribers that opened the e-mail within 24 hours of receiving it?
Perform a significance test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p-value.
What is the probability that the mean price for a sample of 30 service stations is within $.03 of the population mean (to 4 decimals)?
the number of people arriving for treatment at an emergency room can be modeled by poisson process with rate parameter
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