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A central university has a student population of 60,000. The university is interested in determining what proportion of them is in favour of a new grading system. Determine a sample size with confidence level of 95% that will show the true proportion of population in favour of the new system within plus and minus 0.02.
Conduct a test at the .05 level of significance to determine if there is any difference in the mean selling price of new homes in Omaha versus Kansas City.
The university police department must write, on average, five tickets per day to keep department revenues at budgeted levels. Suppose the number of tickets written per day follows Poisson distribution with a mean of 9 tickets per day.
The reason for this difference is not understood. Here are the summary data. Determine if the male scores are significantly higher than the female scores.
A test consist of 30 multiple choice questions, each with five possible answers, only one of which is correct. find the mean and standard deviation of the number of correct answers.
If the names of these 100 people in the building are still unknown but a room is allowed to lodge one tenant at most , then are there how many ways of room occupation?
Health and Nutrition Examination Survey, suppose that weights of men now are normally distributed with mean of m =172 pounds and standard deviation of s = 29 pounds.
We considered Mary's interest in doing a study to see if learning of 6th graders on a math lesson is affected by background noise level. She was planning to use 2 noise conditions and then analyze her outcomes using a t-test for independent groups..
Create a 95% confidence interval for true mean debt for student borrowers.
Perform the 5 steps of hypothesis testing procedure. Please present the calculations and results and Graphs. Make all possible observations and interpret the results
A telephone survey utilized a sampling frame of 2000 numbers, and had a response rate of 25%. A question asked respondents if they preferred Brand 1, Brand 2, or Brand 3.
When would you use a two population test with a small sample size at your place of employment, in your education, or in politics?
the observed rate of drinking was the same in both cases although the sample size of the latter was twice as big. The critical region {X ¯>c} and p-value for the two cases are respectively?
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