BuyFindarrow_forward

Statistics for The Behavioral Scie...

10th Edition
Frederick J Gravetter + 1 other
ISBN: 9781305504912

Solutions

Chapter
Section
BuyFindarrow_forward

Statistics for The Behavioral Scie...

10th Edition
Frederick J Gravetter + 1 other
ISBN: 9781305504912
Textbook Problem

Two separate samples receive different treatments. After treatment, the first sample has n = 9 with S S = 462 , and the second has n = 7 with S S = 420 .

a. Compute the pooled variance for the two samples.

b. Calculate the estimated standard error for the sample mean difference.

c. If the sample mean difference is 10 points, is this enough to reject the null hypothesis using a two-tailed test with α = .05 ?

To determine

Sample variances, Pooled variance, standard error of mean difference, also we need to take decision that a difference of mean is significant or not.

Explanation

Here we have given with different two SS and we need to find variance as well as pooled variance so here we will use general formula so that we can use for any two different sample size.

Here we need to find that the standard error of mean difference that will be described that how far is the distance of the two means of the sample from the population difference. Also we have testing in the part c there will be decide that whether true difference is 10 or not basis of sample data we have.

Given:

Here we are provided with two SS that is SS1=462 and SS2= 420, also for

n1=9, n2=7

Formula used:

For one sample of size n, we have below formulas

Mean= x¯ = 1ni=1nxi

SS= i=1n(xix¯)2

Variance= 1n1i=1n(xix¯)2

If there are two samples of sizes n1and n2 we have the following formula for pooled SD,

Sp=Pooled Variance

SP=(n11)×s12+(n21)×s22(n1+n22)

S12=sample variance of first sample

S22=sample variance of second sample

Denote,

Se=standard error of the mean,

Se=Sp1n1+1n2

Calculation:

  1. Here
  2. n1=9,n2=7 So now

    s12=1n11i=1n1(x1ix1¯)2=46291=57

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 average value of the function f(t) = sec2t on the interval [0, /4].

Single Variable Calculus: Early Transcendentals, Volume I

Expand each expression in Exercises 122. (2y+3)(y+5)

Finite Mathematics and Applied Calculus (MindTap Course List)

g(x)=2(x1)5/2

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

Sometimes, Always, or Never: limxax=0.

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

Identify the two characteristics needed for a research study to qualify as an experiment.

Research Methods for the Behavioral Sciences (MindTap Course List)