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Assume that the population standard deviation is 2 The margin of error for a 98% confidence interval is desired to be =/- 0.5inches.
What should be the sample size?
a production process that fills 12-ounce cereal boxes is known to have a population standard deviation of 0.009 ounce.
It has been reported that the average US office worker receives 14 fax messages per day. For purposes of this exercise, we will assume that the daily number of fax messages is normally distributed with a standard deviation of 5.0 messages.
a pollster conducts a survey to determine the proportion of voters who favor his candidate. out of 1447 people surveyed
Use given data to create the unbiased point estimate of 12σ'> 2 of percentage of termites that are minor workers.
Supposing that the entire $10,000 can be spent on tires (ignoring other costs), and that the true fraction that will fail is approximately .05, can NHTSA attain its goal while staying within the budget? Describe.
Twenty three percent of automobiles are not covered by insurance. On a particular weekend, 35 automobiles are involved in accident.
Suppose you take a sample of size 100 of test scores and find that the mean is 63. What is the z-score corresponding to this sample mean?
1. in 2005 the average gpa for students was 3.15. a sample in 2008 showed that the average gpa for students was 3.46.
The average range found over these samples is 0.15 gallons. What is the upper control limit for the averages in this process?
the transportation safety authority tsa has developed a new test to detect large amounts of liquid in luggage bags.
a) Specify the null and alternate hypotheses for testing that the population correlation is negative. b) Calculate the estimate of the population correlation coefficient between X and Y.
compute the mean median mode and standard deviation for the following discrete probability distribution.value of
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