A statistics student hands each of 300 classmates 2 cookies side by side on a plate. Of the 300 students, 171 choose the cookie that’s on their right hand side, and the remaining 129 choose the cookie that’s on their left. The student says, “That’s just like tossing a coin.” The student’s friend says, “No, it’s not.” Help them settle their argument by performing a one-sample z test in Problems 1 - 3.

Question

1. The test should be

one-tailed. 
two-tailed.

Ans - two-tailed.

2. The P-value of the test is _____%. [Please be careful to enter your answer as a percent; that is, if your answer is 50% then please enter 50 in the blank; not 50%, nor 0.5, nor 1/2, etc.]

3. The test concludes:

“That’s just like tossing a coin.” 
“No, it’s not.”

Ans: "No, it's not".

Can any one help me to ans question 2?

CC · Answer

you know the correct answer to the problem 2 and 6 of the test? The P-value (problem 8) is 1.78 (it is correct)

Sunny · Answer

To CC, 2 is B, 6 is B

CC · Answer

thanks :) had achieved good luck to the course excuse the English'm from Portugal

Gigha · Answer

Hey :) could you please tell me how did you get the answer 1.78 ??? I want to know how to calculate it. Thanks a lot for your help!

Amazon · Answer

Hi CC, Thanks for the ans. I also want to know how to calculate this value? How did u get 1.78? Once again thanks for the ans.

CC · Answer

Mean=300*0.5=150 SD=SQRT(300*0.5*(1-0.5))=8.66 Z=+/- (170.5-150)/8.66 = +/- 2.37 Table of Z P= 2*0.0089 = 1.78% +/- because we have two-tailed and multiple the value of P by 2 for the same reason