Consider another example: An anxiety questionnaire is known to have μ = 50 and σ = 5 in the general population. A sample of 50 college students is given the questionnaire after being asked to prepare...

Consider another example: An anxiety questionnaire is known to have μ = 50 and σ = 5 in the general population. A sample of 50 college students is given the questionnaire after being asked to prepare a 5-minute speech on a topic of their choosing to see if this task elevates their anxiety level from what is expected based on the population mean score on the questionnaire. The sample mean is

·         State the alternative and null hypotheses for this study. Is the alternative hypothesis one-tailed or two-tailed?

·         Calculate the one-sample z score for this sample. What is the probability of obtaining this z score when the null hypothesis is true?

·         For an alpha level of 0.05, what decision would you make for this study? What can you conclude about the speech preparation task and its effect on anxiety level?