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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?
Complete the ANOVA Summary Table and perform post hoc comparison if necessary
For the most recent year available the mean annual cost to attend a private university in the US was $26,889. Assume the distribution of annual costs follows a normal probability distribution and the standard deviation is $4,500. 95% of all studen..
Let p_1 be the proportion of successes in the first population and let p_2 be the proportion of successes in the second population.
You are reviewing a scientific study where the epidemiologists sampled 1000 people from Charleston, South Carolina and measured variation at two loci, A and B.
Assume that 20 students registered for the course. Compute the probability that more than three will withdraw (to 4 decimals).
A newspaper ad for a manager trainee position contained the statement "Our manager trainees have a first-year earnings average of $20,000 to $24,000." Do you think that the ad is describing a confidence interval? Explain your answer.
A review of voter registration records in a small town yielded the following table of the number of males and females registered as Democrat, Republican, or some other affiliation.
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
You want to show an increase in buying and selling of single-family homes this year when compared with last year's rate.
What contingency table test is used to see if there is a difference in the frequency distribution for two different groups?
When 186 homes in Hyde Park, NY were tested for radon, 30 were found to have levels above the maximum safety level. What is the percentage of the Hyde Park homes above the maximum safe level of radon?
Can the college conclude that the students in the new program are significantly different from the rest of the freshman class? Use a two-tailed test with α=.05.
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