Question

Rhino viruses typically cause common colds. In a test of the effectiveness of echinacea, 44 of the 50 subjects treated with echinacea developed rhinovirus infections. In a placebo group, 74 of the 90 subjects developed rhinovirus infections. Use a 0.01 significance level to test the claim that echinacea has an effect on rhinovirus infections.

Complete parts (a) through (c) below.

a. Test the claim using a hypothesis test. Consider the first sample to be the sample of subjects treated with echinacea and the second sample to be the sample of subjects treated with a placebo. What are the null and alternative hypotheses for the hypothesis test?

Identify the test statistic. z= (Round to two decimal places as needed.) Identify the P-value. P-value = (Round to three decimal places as needed.)

b. Test the claim by constructing an appropriate confidence interval. The 99 % confidence interval is =------ < (p 1 - p 2 )<------ (Round to three decimal places as needed.) Enter your answer in the edit fields and then click Check Answer.

Answer #1

Rhino viruses typically cause common colds. In a test of the
effectiveness of echinacea, 33 of the 40 subjects treated with
echinacea developed rhinovirus infections. In a placebo group, 84
of the 98 subjects developed rhinovirus infections. Use a 0.01
significance level to test the claim that echinacea has an effect
on rhinovirus infections. Complete parts (a) through (c) below.
a. Test the claim using a hypothesis test. Consider the first
sample to be the sample of subjects treated with...

Rhino viruses typically cause common colds. In a test of the
effectiveness of echinacea,
44 of the 51 subjects treated with echinacea developed
rhinovirus infections. In a placebo group,
95 of the 112 subjects developed rhinovirus infections. Use a
0.01 significance level to test the claim that echinacea has an
effect on rhinovirus infections.
a. Test the claim using a hypothesis test.
Consider the first sample to be the sample of subjects treated
with echinacea and the second sample to...

2.
Rhino viruses typically cause common colds. In a test of the
effectiveness of echinacea, 35 of the 40 subjects treated with
echinacea developed rhinovirus infections. In a placebo group, 90
of the 107 subjects developed rhinovirus infections. Use a 0.05
significance level to test the claim that echinacea has an effect
on rhinovirus infections. ldentify the test statistic and the
P-Value. Test the claim by constructing an appropriate confidence
interval.(95%)

Rhino viruses typically cause common colds. In a test of the
effectiveness of echinacea, 36 of the 43 subjects treated with
echinacea developed rhinovirus infections. In a placebo group, 96
of the 109 subjects developed rhinovirus infections. Use a 0.01
significance level to test the claim that echinacea has an effect
on rhinovirus infections. Complete parts (a) through (c)
below.
a. Test the claim using a hypothesis test.
b. Identify the test statistic
c. P-value
d. Confidence interval

Rhino viruses typically cause common colds. In a test of the
effectiveness of echinacea, 35 of the 42 subjects treated with
echinacea developed rhinovirus infections. In a placebo group, 80
of the 93 subjects developed rhinovirus infections. Use a 0.05
significance level to test the claim that echinacea has an effect
on rhinovirus infections. What are the null and alternative
hypotheses for the hypothesistest? identify the test statistic and
p-value

Rhino viruses typically cause common colds. In a test of the
effectiveness of echinacea, 46 of the 51 subjects treated with
echinacea developed rhinovirus infections. In a placebo group, 84
of the 101 subjects developed rhinovirus infections. Use a 0.05
significance level to test the claim that echinacea has an effect
on rhinovirus infections. Complete parts (a) through (c) below.
a. Test the claim using a hypothesis test. Consider the first
sample to be the sample of subjects treated with...

Rhino viruses typically cause common colds. In a test of the
effectiveness of echinacea, 38 of the 43 subjects treated with
echinacea developed rhinovirus infections. In a placebo group, 81
of the 96 subjects developed rhinovirus infections. Use a 0.05
significance level to test the claim that echinacea has an effect
on rhinovirus infections. Identify the test statistic.

Rhino viruses typically cause common colds. In a test of the
effectiveness of echinacea, 37 of the 42 subjects treated with
echinacea developed rhinovirus infections. In a placebo group, 98
of the 113 subjects developed rhinovirus infections. Use a 0.01
significance level to test the claim that echinacea has an effect
on rhinovirus infections. Find the test statistic Z to two or more
decimal places and the P-value to three or more places.

Rhino viruses typically cause common colds. In a test of the
effectiveness of echinacea, 40 of the 45 subjects treated with
echinacea developed rhinovirus infections. In a placebo group,
82
of the 98 subjects developed rhinovirus infections. Use a 0.01
significance level to test the claim that echinacea has an effect
on rhinovirus infections. Complete parts (a) through (c)
below.
a) find test statistic
b) find the p-value
c) construct a confidence interval

Rhino viruses typically cause common colds. In a test of the
effectiveness of echinacea,
40 of the 46 subjects treated with echinacea developed
rhinovirus infections. In a placebo group,
91 of the 108 subjects developed rhinovirus infections. Use a
0.01
significance level to test the claim that echinacea has an
effect on rhinovirus infections. Complete parts (a) through (c)
below.
identify the test statistic Z=
find the P-value=

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