A study was done using a treatment group and a placebo group. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a0.05significance level for both parts. TreatmentPlacebo μμ1μ2n2739x2.382.65s0.870.61a. Test the claim that the two samples are from populations with the same mean. What are the null and alternative hypotheses? A.H0:μ1≠μ2H1:μ1<μ2 B.H0:μ1<μ2H1:μ1≥μ2 C.H0:μ1=μ2H1:μ1>μ2 D.H0:μ1=μ2H1:μ1≠μ2Your answer is correct.The test statistic, t, is (Round to two decimal places as needed.)

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Description: A study was done using a treatment group and a placebo group. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population

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MATLAB: An Introduction with Applications

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ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

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A study was done using a treatment group and a placebo group. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below. Use a 0.05 significance level for both parts.			Treatment	Placebo
μ	μ1	μ2
n	27	39
x	2.38	2.65
s	0.87	0.61

a. Test the claim that the two samples are from populations with the same mean.

What are the null and alternative hypotheses?

H0:

μ1≠μ2

H1:

μ1<μ2

H0:

μ1<μ2

H1:

μ1≥μ2

H0:

μ1=μ2

H1:

μ1>μ2

H0:

μ1=μ2

H1:

μ1≠μ2

Your answer is correct.

The test statistic, t, is

(Round to two decimal places as needed.)

Definition Definition Measure of central tendency that is the average of a given data set. The mean value is evaluated as the quotient of the sum of all observations by the sample size. The mean, in contrast to a median, is affected by extreme values. Very large or very small values can distract the mean from the center of the data. Arithmetic mean: The most common type of mean is the arithmetic mean. It is evaluated using the formula: μ = 1 N ∑ i = 1 N x i Other types of means are the geometric mean, logarithmic mean, and harmonic mean. Geometric mean: The nth root of the product of n observations from a data set is defined as the geometric mean of the set: G = x 1 x 2 ... x n n Logarithmic mean: The difference of the natural logarithms of the two numbers, divided by the difference between the numbers is the logarithmic mean of the two numbers. The logarithmic mean is used particularly in heat transfer and mass transfer. ln x 2 − ln x 1 x 2 − x 1 Harmonic mean: The inverse of the arithmetic mean of the inverses of all the numbers in a data set is the harmonic mean of the data. 1 1 x 1 + 1 x 2 + ...

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