Answered: a. Test the claim that the two samples…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Part 1

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	33	39
x	2.34	2.65
s	0.55	0.93

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.
a. Test the claim that the two samples are from populations with the same mean.
What are the null and alternative hypotheses?
OA. Ho: M₁ =H₂
H₁ H₁ H₂
OC. H₂: H₁ =H₂
H₁: H₁ H₂
The test statistic, t, is
The P-value is
State the conclusion for the test.
OB. Ho: H₁ H₂
H₁: Hy ²H₂
O D. H₂: H₁ H₂
H₁ H₁ H₂
(Round to two decimal places as needed.)
(Round to three decimal places as needed.)
|μ
n
S
Treatment Placebo
H₁
33
2.34
0.55
O A. Reject the null hypothesis. There is sufficient evidence to warrant rejection of the claim that the two
samples are from populations with the same mean.
<H₁-H₂
(Round to three decimal places as needed.)
H₂
39
2.65
0.93
B. Reject the null hypothesis. There is not sufficient evidence to warrant rejection of the claim that the two
samples are from populations with the same mean.
O C.
Fail to reject the null hypothesis. There is sufficient evidence to warrant rejection of the claim that the two
samples are from populations with the same mean.
O D.
Fail to reject the null hypothesis. There is not sufficient evidence to warrant rejection of the claim that the
two samples are from populations with the same mean.
b. Construct a confidence interval suitable for testing the claim that the two samples are from populations with the
same mean.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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