# statistics questions

**Dherm74**

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 120x1=120,

n 1 equals 253n1=253,

x 2 equals 132x2=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=0.10

level 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

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