Answered: A researcher wants to investigate…

Name: A researcher wants to investigate sleeping patterns of people who adop
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Description: A researcher wants to investigate sleeping patterns of people who adopt cats, specifically if they can fall asleep faster after petting the cat. He decides to test this by measuring seven participant blood pressure at night before owning a cat and af

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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A researcher wants to investigate sleeping patterns of people who adopt cats, specifically if they can fall asleep faster after petting the cat. He decides to test this by measuring seven participant blood pressure at night before owning a cat and after. Determine if blood pressure decreases after owning a furry friend. The mean difference between the before and after measurement is 23.4, with a standard deviation of 14. Use a significance level of 0.05.

What is the critical value and test statistic ?

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 + ...

Expert Solution

Step 1

Given information-

Mean difference, d-bar = 23.4

Standard deviation, s_d = 14

Sample size, n = 7

Significance level, α = 0.05

We have to test the claim that the blood pressure decreases after owning a furry friend.

Hypothesis Formulation

Null Hypothesis: H_o: µ_d = 0

Alternative Hypothesis: H₁: µ_d > 0

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