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## #1 Re: Help Me ! » Please Help! Statistics - Find the linear correlation coefficient » 2017-07-27 07:19:46

bob bundy wrote:

hi Alex23E

Welcome to the forum.

If you 'google' it you'll find several sites that have calculators for this.  You just have to enter the data.

Bob

Thanks it worked!!

## #2 Help Me ! » Please help!! Find test statistic and confidence level in word problem » 2017-07-27 07:09:06

Alex23E
Replies: 0

A study was conducted to determine the proportion of people who dream in black and white instead of color. Among 315 people over the age of 55, 72 dream in black and white, and among 285 people under the age of 25, 13 dream in black and white. Use a 0.05 significance level to test the claim that the proportion of people over 55 who dream in black and white is greater than the proportion for those under 25.

1) Identify the test statistic. z=
2)Test the claim by constructing an appropriate confidence interval. The 90% confidence interval is _<(p1-p2)<_.

I know what the formula is, I just can't figure out figure it out by hand.

Thanks!!

## #3 Re: Help Me ! » Please Help! Statistics - Find the linear correlation coefficient » 2017-07-25 08:12:28

I believe so. The thing is that I just have to do this for like 10 more problems and don't have much time to do it I know with a graphing calculator it can be done very quickly but I don't have one

## #4 Re: Help Me ! » Please Help! Statistics - Find the linear correlation coefficient » 2017-07-25 07:54:08

Is anyone able to help with the answer! Please let me know

## #5 Help Me ! » Please Help! Statistics - Find the linear correlation coefficient » 2017-07-25 07:26:32

Alex23E
Replies: 6

x    y
10    9.13
8    8.14
13    8.74
9    8.77
11    9.27
14    8.11
6    6.13
4    3.11
12    9.13
7    7.26
5    4.74

b. Find the linear correlation coefficient, r, then determine whether there is sufficient evidence to support the claim of a linear correlation between the two variables.
The linear correlation coefficient is r=

(Round to three decimal places as needed.)