Scenario 2: It is believed that UNL students spend an average of $19 on haircuts. One professor decided to test if her students were spending more than the believed average. The average price of haircutfor the 25 students in her class was $26 with a standard deviation of $20. The distribution of haircuts price for her class was symmetric (not skewed)

What variable is studied here? Classify as either categorical or quantitative. (2pts)

9. What is the parameter of interest in the scenario Use both a symbol and words. (pte)

10. Write the null and alternative hypotheses that are of interest in this scenario in words. (pts)

11. Curry out the appropriate theory-based test using the applet, and report the following: a. The resulting p value (1 point); b. The resulting standardized statistic ( point)

12. Based on the results in #11, would you reject or fail to reject the null hypothesis? Why? (2pts) 13. What conclusion, in context of the study, would you make? 2pts)

The CEO of a large electric utility claims that more than 80% of his customers are very satisfied with the service they receive. To test this claim, the local newspaper surveyed 100 customers using simple random sampling. Among the sampled customers, 73% said that they were very satisfied. Based on these findings, is there evidence to suggest that less than 83% of the customers were very satisfied?

a. What is the population of interest?

-all the customers

-the 100 customers surveryed

-all the people in the united states

-the large electric company

b. What is the sample?

c. What variable is being studied?

d. Describe the parameter of interest in words

e. What is the value of the statistic for this study?

-p=.73

-= .73

-p = .83

-= .83