QUESTIONS 20-22 WILL BE BASED ON THE INFORMATION BELOW

CCC is buying some individual desks for its students and wants to know what percentage of left-handed desks to buy. The buyer's current best guess at the fraction of people who are left-handed is 10% (from historical data), but they know that our statistics students are very good and seeks their advice. The buyer wants to know if the percentage of CCC students who are left-handed is different from 10%. The statistics student decides to poll 380 students about their handedness.

QUESTION 20

Assume that the buyer/statistics student was only curious if there was a greater prevalence of left-handedness at CCC than in the world. Report the p-value of this test, rounded to 4 decimal places. Hint: after p=0.10 in your prop.test code, put a comma and include one of the following:

alternative="two.sided"

alternative="greater"

alternative="less"

You can type ?prop.test in the console and read the examples to the right if you want more guidance. The first option above is for a two-sided/two-tailed test (keywords: different, changed, etc.). The second and third option are used for one-sided/one-tailed tests, where we're only curious about the parameter being on a specific side of the null value (keywords: more, less, increased, decreased, etc.).

QUESTION 21:

Assume that the buyer/statistics student was only curious if there was a lesser prevalence of left-handedness at CCC than in the world. Report the p-value of this test, rounded to 4 decimal places.

QUESTION 22:

Mark True if your statistical conclusions in these 3 scenarios (different vs. lesser. vs. greater prevalence) differed (that is, if any one of them was different from the others). Otherwise, mark False.

Group of answer choices

True

False