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In a 1993 survey of 560 college students, 171 said that they used illegal drugs during the previous year. In a recent survey of 720 college students, 263 said that they used illegal drugs during previous year. Using the sample data, construct the confidence interval corresponding to the hypothesis test conducted with a 0.05 significance level. What conclusion does the confidence suggest?
Design a 95 percent confidence interval for the proportion of defectives in a large lot, if a sample of 200 showed 12 defectives.
Find the questions based on multiple regression - The coefficient of determination for the above model is approximately
The standard screening test for Down's syndrome is based on a combination of maternal age and the level of serum alpha fetoprotein. Using the test 80% of Down's syndrome cases can be identified while 5% of normals are detected as positives.
In a standard test for reaction time, female candidates for flight school are found to have times that are normally distributed with a mean of 0.65 seconds and a standard deviation of 0.15 seconds.
Explain the meaning of the conditional mean of the dependent variable in the population regression function. Illustrate using an example.
One possible explanation for why some birds migrate and others maintain year round residency in a single location is intelligence.
Perform a two-sample z-test for proportions to test if men are more likely than women to make online purchases of books.
Suppose you want to sell your house and you have decided to accept the first offer exceeding M dollars, say. Assume that the offers are i.i.d. with common distribution F. Find the expected number of offers received before selling the house.
suppose the prelliminary results were as follows group 1 n=310,p=32 and group 2 n=309,p=20 construct a 95% confidence interval for the difference in proportions of patients with new hair growth for the two groups using the given data.
Determine a 95% confidence interval for the population mean.
At 0.05 level of significance, is there evidence of significant relationship between age group and where people mainly get their news? If so, describe the relationship.
Preliminary results indicate that once a golfer has checked in, there is only at 20% chance that he or she will be a no-show. This chance of being a no-show can be modeled using the binomial distribution.
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