## anonymous 3 years ago Could someone check my answer to this question (I'll post the question, when I post this problem), to make sure that I did this correctly? "This statement is false. Even though we are given the population mean, the null hypothesis, the alternative hypothesis, and the sample mean, we would need more information, to determine if the claim is true. There is no possible way to determine if this claim is true, without doing a formal test."

1. anonymous

1. If the claim says that the population mean is greater than 200 and the sample mean is 215, we can say that the claim is true even without a formal test.

2. anonymous

Just in case you're wondering - my answer is up in the blue box.

3. anonymous

4. anonymous

ah, I was wondering... thanks :)

5. anonymous

:)

6. anonymous

Does the problem give you the null hypothesis and the alternative hypothesis?

7. anonymous

Well, the question does say that the claim is the population mean is greater than 200. So, I guess I could say that the null hypothesis is: H(0): $H(0): \mu \le 200$

8. anonymous

In general, I think you understand. Knowing the sample mean is 215 is not enough, without more information, to claim that the population mean is above 200. With more information, you could state something like, "There is a 95% chance that the population mean is greater than 200 based on a sample mean of 215". But you would need more information... something like standard deviation... to calculate that.

9. anonymous

Okay, I think I understand what you're saying.

10. anonymous

It would be like sampling student heights in a classroom. You measure a sample of 5 kids' heights... you find the sample mean... but you would need more information to make a claim about the overall student population mean height in the school.

11. anonymous

Oh, okay - that makes sense! Thank you very much! =)

12. anonymous

Glad to help :) Good luck!

13. anonymous

Thanks!