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A newly married couple plans to have four children. Assume that boys and girls are equally likely each time the child is born. Determine the probability couple will have no more than 2 boys?
Nationwide, GMAT scores in a particular year had an average of 528 with an SD of 112 and the scores roughly followed a normal curve. If a student scored 600 on the exam, approximately what percentage of test-takers scored below this student?
What is the mean and standard deviation for this groups' SAT verbal score? What is the 95% confidence interval for the mean SAT verbal score for these students?
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
The famous YS Chang restaurant is open 24 hours a day. Waiters and busboys report for duty at 3am, 7am, 11am, 3pm, 7pm, or 11pm, and each works an 8 hour shift. The following table shows the minimum number of workers needed during the six periods ..
Jointsoft is a great over-the-counter arthritis medication, but who will ever know about it? Unfortunately, many people with arthritis tend to be elderly and rather immobile, so advertisers of arthritis medications face limitations in ways to get ..
A manufacturer of flashlight batteries took a sample of 13 batteries from a day's production and used them continuously until they failed to work.
The pooled variance of two samples is:
Which of the following is not true about the student's t distribution? It has more area in the tails and less in the center than does the normal distribution.
If the city manager knows the average salary nationally is $38,300, which test of significance should be used? Why?
Use a P-value to test the claim about the population mean using the given sample statistics. State your decision for a=0.05. Claim: mean does not = 230
When 6 telephones are received, all of them are free of defects. What is the written description of the complement of the above event?
Determine what analysis would you do on each problem (ie, one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
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