Exam 9: Inferences About Variances

A researcher samples cheerleaders and wants to determine if the variance of the number of cartwheels conducted during a football game prior to attending cheer camp is different than the variance of the number of cartwheels conducted during a football game after attending cheer camp. Which one of the following procedures is appropriate to test this?

A researcher samples high school seniors and wants to determine if the variance of college entrance exam scores for the seniors prior to completing a test taking course is lower than the variance of college entrance exam scores for the same group of seniors after completing a test taking course. Which one of the following procedures is appropriate to test this?

A researcher samples unemployed workers and wants to determine if the variance of depression scores for the unemployed prior to becoming unemployed is higher than the variance of depression scores for the unemployed after becoming unemployed. Which one of the following procedures is appropriate to test this?

A researcher computes the O'Brien procedure and finds an F test statistic of 3.81 and an F critical value of 2.61. Which of the following can be determined?

A researcher conducted the Brown-Forsythe procedure and reports an alpha level of .05 and p value of .80. Which of the following is a correct statement based on this information?

Which of the following is an example of two dependent samples?

A researcher computes the Brown-Forsythe procedure and finds an F test statistic of 4.75 and an F critical value of 3.32. Which of the following can be determined?

Which one of the following procedures is recommended when the distribution is platikurtic?

A researcher wants to determine if the variance of salary of assistant professors differs from the variance of salary of associate professors. Which one of the following procedures is appropriate to test this?

The following summary statistics are available for two dependent random samples: s₁² = 100, s₂² = 225, n = 122, r₁₂ = .50. Test the following hypotheses at the .05 level of significance: :-=0 :-0

A researcher wants to determine if the variance of points scored by teams who have won a national championship differs from the variance of points scored by teams who have not won a national championship. Which one of the following procedures is appropriate to test this?

A researcher wants to determine if the variance of price of cars bought by males differs from the variance of the price of cars bought by females. Which one of the following procedures is appropriate to test this?

A random sample of 51scores is collected with a sample mean of 75 and a sample variance of 10. Test the following hypotheses at the .05 level of significance: :=7 :7

A researcher conducted the O'Brien procedure and reports an alpha level of .05 and p value of .20. Which of the following is a correct statement based on this information?

A random sample of 9 scores is collected with a sample mean of 62 and a sample variance of 16. Test the following hypotheses at the .05 level of significance: :=15 :15

A researcher computes the Brown-Forsythe procedure and finds an F test statistic of 2.35 and an F critical value of 3.78. Which of the following can be determined?

A random sample of 5 scores is collected with a sample mean of 8 and a sample variance of 9. Test the following hypotheses at the .05 level of significance: :=5 :5

A researcher wants to determine if the variance of the amount of entertainment costs for families who live in subsidized housing differs from the variance of the amount of entertainment costs for families who do not live in subsidized housing. Which one of the following procedures is appropriate to test this?

Which of the following is an example of two dependent samples?

A researcher conducted the Brown-Forsythe procedure and reports an alpha level of .01 and p value of .005. Which of the following is a correct statement based on this information?