Good luck!

 
 

8. Not wanting to risk poor sales for a new soda flavor, a company decides to run one more taste test on potential customers, this time requiring a higher approval rating than they had for earlier tests. This higher standard of proof will increase

I. the risk of Type I error      II. the risk of Type II error      III. power

A) II only         B) I only           C) III only       D) I and II       E) I and III

 

9. Which is true about a 98% confidence interval for a population proportion based on a given sample?

I.    We are 98% confident that other sample proportions will be in our interval.

II. There is a 98% chance that our interval contains the population proportion.

III. The interval is wider than a 95% confidence interval would be.

A) None          B) I only          C) II only        D) III only       E) I and II

 

10. A statistics professor wants to see if more than 80% of her students enjoyed taking her class. At the end of the term, she takes a random sample of students from her large class and asks, in an anonymous survey, if the students enjoyed taking her class. Which set of hypotheses should she test?

Screen Shot 2017-11-14 at 7.52.47 PM.png