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Mathematics, 31.12.2019 02:31 kdcupcake8004
In constructing 95% confidence interval estimate for the difference between the means of two normally distributed populations, where the unknown population variances are assumed not to be equal, summary statistics computed from two independent samples are as follows:
n1=50 x1_bar=756 s1=35
n2=50 x2_bar=762 s2=30
the lower confidence limit is:
a.
-77.3
b.
-18.78
c.
-8.62
d.
-6.78
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