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Compare the bell shaped curve for sample means of two different sizes.
How does the bell-shaped curve for the sampling distribution of sample means for samples of size n = 100 compare to the bell-shaped curve for sampling distribution of sample means for samples of size n = 60?
What IQ score should one have in order to be eligible for Mensa?
Conduct a marketing experiment in which students are to taste one of two different brands of soft drink
Create the indicated confidence interval for population mean µ using a t- distribution.
What is the probability that the sample mean will be greater than M = 510. In symbols, what is p (M>510)?
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card.
A arbitrary sample of 8 students is selected. Illucidate the probability that among the students in the sample at least 7 are female.
A major study examined the relationship between cause of death (heart attack, cancer, stroke, accident, etc.) and age. A good way to graphically represent the relationship is with
To test whether there is a significant mean difference among the three.
Find a 98% confidence interval for the mean number of days required for successful completion of physical therapy for patients in the average group. Discuss the results.
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
Assume you want to repeat the FDA experiment to achieve an estimation of the mean μ of the amount of caffeine content of a cup of coffee.
A sample of 64 Atlanta consumers showed a mean quarterly water bill of $51 with a sample standard deviation of $12. At α = .05, does the Atlanta sample support the conclusion that above-average rates exist for this private water system?
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