Question

Psychologists conducted a survey of 258 student drivers and their attitudes toward speeding and reported the results in the British Journal of Educational Psychology (Vol. 80, 2010). One of the variables of interest was the response to the question, "Are you confident that you can resist your friends' persuasion to drive faster?" Each response was measured on a 7-point scale, from 1 = "definitely no" to 7 = "definitely yes." The data were collected 5 months after the students had attended a safe-driver presentation. The psychologists re- ported a sample mean response of 4.98 and a sample standard deviation of 1.62. Suppose it is known that the true mean response of students who do not attend a safe-driver presentation is µ = 4.7. You want to know whether the safe-driver presentation was effective in helping students feel more confident that they can resist their friends' persuasion to drive faster.

a. what kind of hypothesis test you should use.

b. State the null hypothesis and alternative hypothesis in both formula and word formats.

c. Using MINITAB to find the p-value for the test.

d. At α = 0.05, what is the appropriate conclusion? Which type of error is possible? the conclusion

e. Using MINITAB to find the 96% confidence interval for the population means.

Answer #1

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