Conduct a test at the alphaαequals=0.100.10 level of significance by determining (a) the null and alternative hypotheses, (b) the test statistic, and (c) the P-value. Assume the samples were obtained independently from a large population using simple random sampling.
Test whether p 1 greater than p 2p1>p2. The sample data are x 1 equals 120×1=120, n 1 equals 253n1=253, x 2 equals 132×2=132, and n 2 equals 319n2=319.
Construct a confidence interval for p 1 minus p 2p1−p2 at the given level of confidence.
x 1 equalsx1=384, n 1 equalsn1=524, x 2 equalsx2=414, n 2 equalsn2=558, 90% confidence
In a clinical trial of a vaccine, 8,000 children were randomly divided into two groups. The subjects in group 1 (the experimental group) were given the vaccine while the subjects in group 2 (the control group) were given a placebo. Of the 4,000 children in the experimental group, 75 developed the disease. Of the 4,000 children in the control group, 106 developed the disease.
Determine whether the proportion of subjects in the experimental group who contracted the disease is less than the proportion of subjects in the control group who contracted the disease at the alphaαequals=0.10level of significance.
A researcher wants to show the mean from population 1 is less than the mean from population 2 in matched-pairs data. If the observations from sample 1 are
Xi
and the observations from sample 2 are
Yi,
and
diequals=Ximinus−Yi,
then the null hypothesis is
H0:
muμdequals=0
and the alternative hypothesis is
H1:
muμd
___ 0.
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