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Conduct a two-sample test of means. A study by a bank compared the average savings of customers who were depositors for three years or less with those who had been depositors for more than three years.The results of a sample are < or equal mean balance savings 1,200, population standard deviation 100, and sample size 10. > 3 years mean savings balance 1,250, population standard deviation 150, and sample size 15. To test the two groups of customers have equal savings rates, what is the critical value of using a=0.05?
How does bell-shaped curve for sampling distribution of sample means for samples of size n =120 compare tobell-shaped curve for sampling distribution of sample means for samples of size n =95?
The percentage rates of home ownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 99% confidence level.
Without constructing the 98% confidence interval for the rate of effectiveness, would you expect the interval to be longer or shorter compared to the 95% confidence interval? Why?
Where does the p-value come from for the spatial scan statistic used in SaTScan? Explain how Monte Carlo simulation is used to derive a p-value for a cluster.
What is the value of the population mean? What is the best estimate of this value?
The formula for a 95% confidence interval yields the interval 640 ± 5.88. Find out whether each of the given statements is true or false.
The random variable x is known to be uniformly distributed between 1.0 and 1.5.
A sample of 148 of our statistics students rated their level of admiration for Hilary Rodham Clinton on a scale of 1 to 7. The mean rating was 4.06 and the standard deviation was 1.70.
Determine the expected value and standard error of the sum of 400 draws?
Find a 95% confidence interval for the mean µ of the population from which the men were selected.
If one person is selected at random, what is the probability that person is Female?
A sample of 30 students are tested (sample mean=58, standard error=3.2). Compute a 99 percent confidence interval based on this sample's data. How do these students compare to the national sample?
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