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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.
Find the optimal order quantity and what is the optimal total ordering cost per year vs. what is that cost with the current policy?
Suppose that during a basketball practice. Joe tries 3 shots from the free throw line; imagine further that he has a probability equal to 0.6 of making each shot and that the attempts are independent. Let 'X' be the number of baskets he makes in t..
Payne (2001) gave participants a computerized task in which they first see a face and then a picture of either a gun or a tool. The task was to press one button if it was a tool and a different one if it was a gun.
How many dissimilar computer passwords are possible?
A company is interested in estimating the mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee.
The first unit produced after the calibration effort to be found to be defective. What is the probability that machine is in adjustment?
Locate value of the population mean in your sketch and make an estimate of the standard deviation
What sample size would be needed to obtain an error of ±10 square millimeters with 99 percent confidence?
A random sample of 20 single men was asked if they would welcome a woman taking the initiative in asking for a date. What is the probability that
A part of our research design is the data collection process. We often do this by sampling. Differentiate between random and nonrandom sampling methods.
An experiment was carried out to assess the effects of four tomato varieties and four planting densities on yield. There were 64 plots, and each of the 16 factor combinations was randomly assigned to 4 plots
What are differences between dependent and independent samples? Provide examples. What are the implications for determining the tests used to analyze data?
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