BuyFindarrow_forward

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

Solutions

Chapter
Section
BuyFindarrow_forward

Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570
Textbook Problem

a. A repeated-measures study with a sample of n = 9 participants produces a mean difference of M = 3 with a standard deviation of s = 6. Use a two-tailed hypothesis test with α = .05 to determine whether it is likely that this sample came from a population with μ D = 0.

b. Now assume that the sample mean difference is MD = 12, and once again visualize the sample distribution. Use a two-tailed hypothesis test with α = .05 to determine whether it is likely that this sample came from a population with µD = 0.

c. Explain how the size of the sample mean difference influences the likelihood of finding a significant mean difference.

a.

To determine
If the result significant enough to conclude that Ritalin improves attention span.

Explanation

Given info:

Sample of n=20 children were used in a study. The data show an average increase of attention span of MD=4.8 minutes and variance equal to s2=125 for the sample of difference scores.

Calculation:

Stating the testing hypotheses:

Null Hypothesis:

H0:μD0.

Alternate Hypothesis:

Ha:μD>0

Degrees of freedom is:

df=n1=201=19

With α=0.05 and df=19 critical value is : CV=1.729

The formula for standard error difference is

sMD=s2n=12520=6

b.

To determine
The 80% Confidence interval.

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Additional Math Solutions

Find more solutions based on key concepts

Show solutions add

Find the exact areas of the shaded regions in Exercises 27 to 31.

Elementary Geometry For College Students, 7e

Digital Versus Film Cameras The sales of digital cameras (in millions of units) in year t are given by the func...

Applied Calculus for the Managerial, Life, and Social Sciences: A Brief Approach

Finding a Derivative dy/dx. x=2e,y=e/2

Calculus: Early Transcendental Functions (MindTap Course List)

11. Find y’ if .

Mathematical Applications for the Management, Life, and Social Sciences

In Exercises 110, evaluate the expression. 15!

Finite Mathematics for the Managerial, Life, and Social Sciences

The solution to y = y2 with y(1)=13 is: a) y=1x+2 b) y=lnx+13 c) y=12x216 d) y=12x16

Study Guide for Stewart's Single Variable Calculus: Early Transcendentals, 8th

Consider a sample with data values of 10, 20, 21, 17, 16, and 12. Compute the mean and median.

Statistics for Business & Economics, Revised (MindTap Course List)