Julian

2010-03-25, 23:13

This is a practice test, not homework (I already know the answer, but I want to know how to find it)

An article in a journal reports that 34% of American fathers take no responsibility for child care. A researcher claims that the figure is higher for fathers in the town of Cheraw. A random sample of 225 fathers from Cheraw, yielded 97 who did not help with child care. Find the P-value for a test of the researcher's claim.

The answer is 0.0019.

I don't really know this section that well :( I kinda get the null/alternate hypothesis stuff, for example, H0 here is that mu (would it be mu in this problem?) = .34, and H1: mu(?) > .34

Yeah I'm kinda lost, and this book is a piece of shit that isn't really helping, any help would be appreciated, thanks!

edit: Here's 2 more problems I don't really get:

In a poll of 278 voters in a certain city, 67% said that they backed a bill. The margin of error in the poll was reported as 6 percentage points (w/ a 95% degree of confidence) Which statement is correct?

A) The sample size is too small to achieve the stated margin of error

B) For the given sample size, the margin of error should be larger than stated

C) The reported margin of error is consistent with the sample size (correct answer)

D) There is not enough info to determine whether the margin of error is consistent w/ the sample size

E) For the given sample size, the margin of error should be smaller than stated.

Also another problem, except it's a poll of 390, 77% backed it, ME is 5% w/ 95% degree of confidence, and the answer is "The stated margin of error could be achieved with a smaller sample size"

Don't really get what's going on with those 2, any help would be appreciated :x thanks again

An article in a journal reports that 34% of American fathers take no responsibility for child care. A researcher claims that the figure is higher for fathers in the town of Cheraw. A random sample of 225 fathers from Cheraw, yielded 97 who did not help with child care. Find the P-value for a test of the researcher's claim.

The answer is 0.0019.

I don't really know this section that well :( I kinda get the null/alternate hypothesis stuff, for example, H0 here is that mu (would it be mu in this problem?) = .34, and H1: mu(?) > .34

Yeah I'm kinda lost, and this book is a piece of shit that isn't really helping, any help would be appreciated, thanks!

edit: Here's 2 more problems I don't really get:

In a poll of 278 voters in a certain city, 67% said that they backed a bill. The margin of error in the poll was reported as 6 percentage points (w/ a 95% degree of confidence) Which statement is correct?

A) The sample size is too small to achieve the stated margin of error

B) For the given sample size, the margin of error should be larger than stated

C) The reported margin of error is consistent with the sample size (correct answer)

D) There is not enough info to determine whether the margin of error is consistent w/ the sample size

E) For the given sample size, the margin of error should be smaller than stated.

Also another problem, except it's a poll of 390, 77% backed it, ME is 5% w/ 95% degree of confidence, and the answer is "The stated margin of error could be achieved with a smaller sample size"

Don't really get what's going on with those 2, any help would be appreciated :x thanks again