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David Gallano, a wine merchant, has collected opinions on grape wine quality from a sample of his customers. These customers tasted wine made from grapes grown in three regions of the country. They rated the wine quality on a scale of 1 (best) to 4 (worst). The following is the data obtained for customer quality rating of wine by grape-growing region.
Quality Rating Growing Regions ---- Row Total
I II III
1 15 10 6 31
2 7 13 12 32
3 11 12 8 31
4 3 8 15 26
Column Total 36 43 41 120
David wants to know whether quality ratings are or, are not independent of grape growing region. Can you conclude at a 95% confidence that the quality rating is independent of the grape growing region?
The chairperson of the marketing department at a university undertakes a study to relate the starting salary after graduation for marketing majors to overall grade point average (GPA). To do this, he/she identifies records of seven randomly selected recent marketing graduates. The results are:
Marketing Graduates Starting salary in thousands of dollars GPA
1 33.8 3.26
2 29.8 2.60
3 33.5 3.35
4 30.4 2.86
5 36.4 3.82
6 27.6 2.21
7 35.3 3.47
Compute the equation of the regression line and interpret the results.
Is there evidence to suggest a difference in the mean waiting times at the four body shops?
Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
In teaching the role of statistical application in Health Science, the importance of reliable and valid data is very critical in research process.
Extra college-level training, and rest of the sailors arn't accounted for. How does your sample compare to what you expected to determine? Define null hypothesis.
Perform a significance test to assess whether there is an association between mortality from cirrhosis of the liver and duration of employment in the group hired after 1945. Report a p- value.
What is the standard error of measurement for the test? What range of scores would you expect an individual who made 54 on the test to make on another test of similar difficulty? Assume you want to be 68% accurate in your estimate.
A design for 2 treatments has p pairs of blocks. Each block has three plots. In each pair one block has two plots with A and one with B, and the other has two plots with B and a single plot with A.
Give the 90% confidence interval for the mean score in the population of all young women.
What is the probability that the drug will be effective for 2 hours or less?
Utilizing the 5% level of significance as there was a significant change in cholesterol level. Their total cholesterol levels before also after the diet.
Compute the mean of the sampling distribution? Compute the standard deviation of sampling distribution?
In each of the following situations, the sampling frame does not match the population, resulting in undercoverage. Give examples of population members that might have been omitted:
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