Exam 17: Testing for Differences Between Two Groups or Among More Than

Which of the following states that the difference between the population parameters between two groups is zero?

Let's assume there are juniors, seniors, and graduate students in your class and we want to know if their average GPAs differ. What is the proper statistical test?

ANOVA is used to determine if there is any correlation among three or more paired groups or samples.

In interpreting the output for the Duncan's multiple range test, different means are listed as different subsets.

Tommy Prothro, a marketing manager for Golden Snack Bars, has commissioned marketing research to determine if one recipe of snack bar is superior to another recipe. More than 400 persons who were "snack bar eaters" were involved in taste tests and, after tasting both recipes, they were asked which recipe they would purchase the next time they purchased snack bars. Tommy is now looking at the data and he sees that recipe A had 53 percent stating a preference, whereas recipe B had 47 percent. Tommy's brand manager felt this was "significant" evidence that the firm should produce recipe A. But Tommy wanted more evidence so he asked the research firm to run a test to determine if there was a significant difference between the two recipes. By doing this, Tommy would get information that would allow him to determine:

To test whether a true difference exists between two group percentages, we test the ________ hypothesis.

Which best represents the correct meaning of statistical significance?

Iams marketing over 20 different types of dog food, Toyota marketing over 20 different types of cars, and Boeing having five different types of commercial jets and a separate business jets division are all examples of:

Market segmentation holds that different types of consumers have different requirements.

If we adopt a 95 percent level of confidence, we need a P value, to be significant (i.e., flag is waving)if it is:

Mike Shula is a head football coach. His athletic department spends $30,000 a season on Lizard-Aide, a flavored drink that supposedly contributes to the performance of his players. This year, an independent sports testing association has decided to test the merits of Lizard-Aide and Shula's university has been selected as a member of the national sample. The study is an experiment in which the players, unknown to them, are divided into two groups. Group 1 receives the real Lizard-Aide prior to and during the games. Group 2 receives a placebo, which is nothing more than sugar-flavored colored water in containers made to make the sugar-flavored water appear to be Lizard-Aide. It is common practice that, following each game, the coaches evaluate films and give each player a grade ranging from 0 to 100. After the season the sports testing association collects the data. They now have a mean score of performance for each of the two groups for all of the athletic departments participating in the study. If you are the researcher, what statistical test would you conduct?

Which of the following requirements of differences means that the marketer can focus various marketing strategies and tactics, such as product design or advertising, on the market segments to accentuate the differences between the segments?

If we were comparing the difference between the mean number of sports drinks consumed by males versus females, and we calculated a z value of 6.43, we would conclude that:

Duncan's multiple range test, Scheffe's test, and Tukey's test are used for:

Tommy Prothro, a marketing manager for Golden Snack Bars, has commissioned marketing research to determine if one recipe of snack bar is superior to another recipe. More than 400 persons who were "snack bar eaters" were involved in taste tests and, after tasting both recipes, they were asked which recipe they would purchase the next time they purchased snack bars. Tommy is now looking at the data and he sees that recipe A had 53 percent stating a preference whereas recipe B had 47 percent. Tommy's brand manager felt this was "significant" evidence that the firm should produce recipe A. But Tommy wanted more evidence so he asked the research firm to run a test to determine if there was a significant difference between the two recipes. When the firm ran the test, they reported a z value of 5.64. This means:

The fact that different segments of flu or cold sufferers will consistently seek different medications targeted at their symptoms (sore throat, nasal congestion, cough, etc.)illustrates the use of:

Fortunately, when testing for differences, you will not need to be concerned whether to use the t or z test because:

A winery sees the market in three distinct segments based upon usage of wine; a dog food manufacturer sees the dog food market in 12 segments; Toyota offers 17 different models ranging from a two-seater sports car to the Avalon luxury car. These are all examples illustrating how:

In order to be potentially useful for a marketing manager, differences must at minimum be:

Rebecca Sims is the general manager of a chain of auto parts stores. There are 400 stores in the country and they are divided up into seven divisions based upon geography. Each division has a division manager. The firm prides itself on keeping close tabs on customer satisfaction, and Rebecca has decided to take a sample of the 400 to test a new surrogate measure of customer satisfaction; the dollar value of returned merchandise. Each sample store reports daily the dollar value of merchandise returned and an average is calculated for each division. When Rebecca sees the first set of results, she wants to know if the differences between the division means are real or due to sampling error. Rebecca should use which test?