What is the purpose of "post hoc" tests?
a. These determine where the pair(s) of statistically significant differences between the means exist(s) when ANOVA flags that at least one pair of means has a statistically significant difference.
b. These are used with online surveys to provide a way for the manager to assess the meaningfulness of the difference between two means or percentages in very large sample difference testing.
c. They test the null hypothesis that no differences exist between two group means (or percentages).
d. They are "after-the fact" confirmation for all differences tests.
e. They are tests to determine if differences are stable.
Answer: a. These determine where the pair(s) of statistically significant differences between the means exist(s) when ANOVA flags that at least one pair of means has a statistically significant difference.
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Marketing Research Chapter 13
- The confidence interval for a proportion uses which of the following formulas?
- If 35 percent of TV viewers recalled seeing an ad for a Toyota Prius on a particular television program based on a sample of 800 viewers, the 95 percent confidence interval for this study would be between approximately _____.
- An estimate of the population mean in the form of a single value, usually the sample mean, is called a _____.
- If the sample standard deviation is 10.5 and the sample mean is 48 based on a study with a sample size of 120, the 95 percent confidence interval about the mean is between approximately _____.
- In statistical terms, ______ the sample size ______ the width of the confidence interval about the mean at a given confidence level.
- Which of the following is a step in determining sample size?
- The formula below is used to calculate the ______ .
- Which of the following represents the standard deviation of the sampling distribution?
- Which theory states that as sample size increases, the distribution of sample means of size n, randomly selected, approaches a normal distribution?
- All of the following are characteristics of the standardized normal distribution EXCEPT _____.
- If the population mean is assumed to be 20 and the sample standard deviation is 5, a score of 15 would have a Z-value of _____.
- A frequency distribution of the population elements is called a _____.
- A frequency distribution of a sample is called a(n) _____.
- Which of the following is the symbol for the population standard deviation?
- The _____ distribution is a symmetrical, bell-shaped distribution that describes the expected probability distribution of many chance occurrences.
- One of the most common probability distributions in statistics is the _____ distribution.
- Which of the following is the symbol for the sample standard deviation?
- Find the approximate standard deviation of the following set of scores: 3, 6, 2, 7, 8 .
- Which of the following eliminates the drawback of having the measure of dispersion in squared units rather than in the original measurement units?
- If the average units produced in a month by a Ford Motor Co. plant for Ford Explorers is 22, but only 18 Explorers are produced on a given day in that same month, the deviation score for this one day is _____.
- If the price of a product ranges from $59 to $179, the range of these prices is _____
- Which of the following is a measure of dispersion?
- Find the mode of the following scores: 1, 2, 3, 4, 5, 5, 7
- The measure of central tendency that identifies the value that occurs most often is called the _____.
- Find the median of the following scores: 1, 2, 3, 4, 5, 5, 7