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A random sample of 50 men, 40% said they preferred walking up stairs than taking the elevator. In a random sample of 40 women, 50% said they preferred the stairs. The standard error for the difference between the two sample proportions in this situation is?
If one of the Titanic passengers is randomly selected, find the probability of getting a woman or someone who didn't survive the sinking.
How can we be certain that surveys and statistics that we hear about in the media are accurate samples and unbiased? Is there a way to dissect the information and determine if a probability sample was used?
They decide to sample some fast-food restaurants currently operating to estimate the monthly cost of electricity. They want to be 90% confident of their results and want the error of the interval estimate to be no more than $100.
In order to test the assumption of a Poisson distribution, a random sample of 150 ten-minute intervals was taken.
Quality control inspectors randomly select 16 parts, weigh each, and then compute the sample average weight for the 16 parts. The probability that the mean weight of these 16 parts is more than 41 grams or less than 39 grams is?
The researcher also gathers data on age and major to see if there is any connection between these varibales and frequency of sexual harassment.
Then, give two examples of correlation which are evaluated in a business environment and discuss the decision made by evaluating the correlation.
Can you conclude that u1 is not equal to u2 at alpha=.05? State the hypothesis in orders of 1-2. construct a 99% confidence interval for the difference in true means. State the confidence interval in terms of 2-1.
If, on the average, 20 orders are received by fax every two hours throughout the day, find the a. probability that a faxed order will arrive within the next 9 minutes.
A statistics practitioner conducted a two-factor analysis of variance experiment with a =4, b = 3, and r = 8. The sum of squares are listed here:
Can the president conclude that the average family income at his school is significantly different than the population mean family income of the reported university?
What are the 3 measures of dispersion/variation in a dataset? How do you calculate each of these 3 measures?
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