9.12 Independent random samples selected from two normal populations produced the following sample means and standard deviations: Sample 1 Sample 2 n1 = 17 m₂ = 12 = = X1 5.4 3.4 x2 = 7.9 4.8 = $1 = $2 a. Assuming equal variances, conduct the test Ho: (μ₁ −µ₂) = 0 against Hai (µ₁ − µ₂) ‡ 0 using α = .05. b. Find and interpret the 95% confidence interval for (μ₁ −μ₂).

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9.12 Independent random samples selected from two normal
populations produced the following sample means and
standard deviations:
Sample 1
Sample 2
n₁ 17
=
-
n2
12
X1 5.4
x2 7.9
=
S1 =
3.4
$2 4.8
-
a. Assuming equal
variances, conduct the test
Ho: (μ₁ −μ₂) = 0 against H₁: (µ₁ − µ₂) ‡ 0 using
α= = .05.
b. Find and interpret the 95% confidence interval for
(μι – μη).
Transcribed Image Text:9.12 Independent random samples selected from two normal populations produced the following sample means and standard deviations: Sample 1 Sample 2 n₁ 17 = - n2 12 X1 5.4 x2 7.9 = S1 = 3.4 $2 4.8 - a. Assuming equal variances, conduct the test Ho: (μ₁ −μ₂) = 0 against H₁: (µ₁ − µ₂) ‡ 0 using α= = .05. b. Find and interpret the 95% confidence interval for (μι – μη).
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