When doing a T-Test to compare two population means with unknown population standard deviations, the formula for finding the Degrees of Freedom is pretty messy: 2 n2 d. f. = %3D 12 -1 You can compute this by hand, or just do the 2-SampTTest on a calculator and select "No" after the Pooled? prompt. Consider the random sample data in this table: Рop 28 115 11 2 22 106 14 Use a calculator to find the following for a two tailed test. Round all answers to three decimals. a. d. f. : b. Т: c. P - value :

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When doing a T-Test to compare two population means with unknown population standard deviations, the
formula for finding the Degrees of Freedom is pretty messy:
2
n2
d. f. =
1
n1-1
n2 -1
You can compute this by hand, or just do the 2-SampTTest on a calculator and select "No" after the Pooled?
prompt.
Consider the random sample data in this table:
Pop
1
28
115
11
2
22
106
14
Use a calculator to find the following for a two tailed test. Round all answers to three decimals.
a. d. f.:
b. Т:
c. P - value :
You can also use a "simpler" estimation for Degrees of Freedom: d. f. = smaller sample size - 1
Using this formula, with the STS you got for part b, find:
d. d. f. estimate:
e. P - value :
13
MacBook Air
esc
000
GO0
F4
F1
F3
FS
F7
%23
3.
4.
5
6
W
R
E.
Transcribed Image Text:When doing a T-Test to compare two population means with unknown population standard deviations, the formula for finding the Degrees of Freedom is pretty messy: 2 n2 d. f. = 1 n1-1 n2 -1 You can compute this by hand, or just do the 2-SampTTest on a calculator and select "No" after the Pooled? prompt. Consider the random sample data in this table: Pop 1 28 115 11 2 22 106 14 Use a calculator to find the following for a two tailed test. Round all answers to three decimals. a. d. f.: b. Т: c. P - value : You can also use a "simpler" estimation for Degrees of Freedom: d. f. = smaller sample size - 1 Using this formula, with the STS you got for part b, find: d. d. f. estimate: e. P - value : 13 MacBook Air esc 000 GO0 F4 F1 F3 FS F7 %23 3. 4. 5 6 W R E.
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