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Shank's Inc., a nationwide advertising firm, wants to know whether the size of an advertisement and the color of the advertisement make a difference in the response of magazine readers. A random same of readers is shown ads of four different colors and three different sizes. Each reader is asked to give the particular combination of size and color a rating between 1 and 10. Assume that the ratings follow the normal distribution. The rating for each combination is shown in the following table:
Color of Ad
Size of Ad Red Blue Orange Green
Small 2 3 3 8
Medium 3 5 6 7
Large 6 7 8 8
Is there a difference in the effectiveness of an advertisement by color and by size? Use the .05 level of significance.
Five test vehicles of each kind were crashed, with results given below. Research question: Are mean crash damages the same for these 3 vehicles?
Use the Standing data set to develop a point estimate of the number of minutes during an NFL game that players are standing around between plays. Round your answer to two decimal places. What is the sample standard deviation? Round your answer to ..
To test whether there is any association between two variables using Chi-Square test for independence.
The National Center for Education Statistics reported that 47% of college students work to pay for tuition and living expenses. Assume that a sample of 450 college students was used in the study.
a) How is it possible that the minimum of the 365 values is 0 inches and the median is also 0 inches? b) Describe the distribution as symmetric, left-skewed or right-skewed.
What is the chi-square goodness of a fit test? What is its purpose? What does it measure? Is there a way of telling when the test is over?
Determine percent of the garages take between 29 hours and 34 hours to erect? Determine percent of garages take 28.7 hours or less to erect?
Do the data in the sample represented in the Excel file support his contention at the .05 level of significance?
You attempt a 50 item (n = 50) true-and-false exam. You did not study for the material and your attempt to answer any item is a guess, with a 50% chance that you will get any item correct. You need a score of 30 or better to pass the exam.
Utlizing binomial approximation to normal finding the normal model. A grower claims that only 13 percent of the strawberries he grows are unsatisfactory.
For each of the F statistics given above find the degrees of freedom and an approximate P-value. Summarize the results of these tests.
The share of the national car manufcturers market in South Africa is shown in the table below:
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