Answered: Assume that the two samples are…

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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Question

Assume that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal.

Refer to the accompanying data set. Use a 0.01 significance level to test the claim that women and men have the same mean diastolic blood pressure.

Let μ1 be the mean diastolic blood pressure for women and let

μ2 be the mean diastolic blood pressure for men. 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

Calculate the test statistic.

t=_____

(Round to two decimal places as needed.)

Find the P-value.

P-value=_____

(Round to three decimal places as needed.)

Make a conclusion about the null hypothesis and a final conclusion that addresses the original claim.

▼

Fail to reject

Reject

H0.

There

▼

is not

sufficient evidence to warrant rejection of the claim that women and men have the same mean diastolic blood pressure.

Data for diastolic blood pressure of men and women
Women
Men
Women
Men
70.0
71.0
64.0
65.0
93.0
65.0
73.0
81.0
81.0
68.0
56.0
91.0
67.0
59.0
59.0
80.0
73.0
65.0
79.0
89.0
81.0
70.0
71.0
63.0
58.0
59.0
70.0
71.0
50.0
40.0
65.0
78.0
71.0
66.0
67.0
75.0
87.0
65.0
83.0
58.0
69.0
83.0
54.0
67.0
60.0
75.0
75.0
85.0
71.0
54.0
75.0
71.0
68.0
68.0
69.0
75.0
72.0
61.0
76.0
51.0
65.0
52.0
91.0
88.0
91.0
57.0
56.0
77.0
82.0
83.0
80.0
81.0
70.0
61.0
77.0
68.0
61.0
73.0
65.0
77.0
71.0
81.0
73.0
67.0
73.0
103.0
62.0
51.0
89.0
60.0
88.0
65.0
71.0
79.0
55.0
72.0
67.0
73.0
75.0
66.0
69.0
83.0
75.0
76.0
71.0
65.0
90.0
52.0
83.0
67.0
65.0
53.0
74.0
55.0
70.0
66.0

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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