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Chapter 10

Based on the following results, which would be the correct use of the formula t = (M 1–M 2) /S Difference? Sample 1: Mean = 60; Variance of the distribution of means = 2. Sample 2: Mean = 50; Variance of the distribution of means = 7.

In an ANOVA, if the between-group variance estimate is 640 and the within-group variance estimate is 110, the F ratio is __________.

Suppose a study has a sample mean of 95, the mean of Population 2 is 75, and the standard deviation of the distribution of means is 5. Using a single-sample t test, what is the t score?

A sociologist interested in salesperson-consumer interaction wanted to know if customers really are influenced to buy more from sales clerks who smile. To test this, clerks at eight stores in a large Canadian clothing chain were given special instructions at the start of a week, and the number of sales over the week were recorded. Four of the stores were randomly selected to have the clerks receive instructions to be especially courteous and to smile a lot. Clerks at four other stores were simply instructed to be especially courteous. Sales (in thousands of dollars) for the four stores in the smile condition were 36, 40, 36, and 44; sales for the four stores in the control condition were 40, 31, 27, and 30. Do these results suggest that customers might buy more if they encounter smiling sales clerks? (Use the .05 level.) a. Use the five steps of hypothesis testing and show your calculations.b. Explain your findings.

A sports psychologist gave a standard written test of eating habits to 12 randomly selected professionals, four each from baseball, football, and basketball. The results were as follows:Is there a difference in eating habits among professionals in the three sports? (Use the .05 significance level.)a. Use the five steps of hypothesis testing, showing your calculations.b. Sketch the distribution involvedc. Explain results

The number of degrees of freedom used to determine the cut-off sample score from a t table when conducting a t test for independent means is the

Multiply 7)  

Fractions reduce to lowest terms 31)

Ratio and Proportion 30)  57 books to 95 students, how many books to 5 students?