Purchase Solution

Hypothesis Testing, Cohen's d & Effect Size

Not what you're looking for?

Ask Custom Question

1. One sample has SS= 35 and the second sample has SS=45.
a) assume that n=6 for both, calculate the sample variance, and the pooled variance.
b) assume that n=6 for one and n=16 for the other, calculate the two sample variances and the pooled variance.

2. A sample of n=10 people receive medication with pain tolerance and n=10 for people who received a placebo. The score for the placebo group produce a mean of M=38 with SS=150
a) if the score for the medication group have a mean of M=42 with SS= 210, are the data sufficient to conclude that the medication has a significant effect? Use a two tailed test with α= .05
b) the medication group averaged 4 points higher than the controlled group.If the effect was 8 points, so the medication group had a mean of M=46 with SS=210 would the data be sufficient to conclude that there is a signficant effect? Use a two tailed test with α= .05

3. Number of Sentences Recalled
Humorus Sentences Nonhumorus Sentences
4 5 2 4 5 2 4 2
6 7 6 6 2 3 1 5
2 5 4 3 3 2 3 3
3 3 5 3 4 1 5 3

a) Do the data provide enough evidence to conclude that humor has a significant effect on memory? Use a two-tailed test at .05 level of significance.
b) Calculate Cohen's d to evaluate the size of the effect.
c) Calulate the precentage of variance explained by the treatment, r2, to measure the effect size.

4) A researcher conducts an independent-measure research study and obtains t=2.070 with df= 28.
a) How many individuals participated in the entire research study?
b) Use a two-tailed test with α=.05, is there a significant difference between the two treatment conditions?
c) Compute r2 to measure the percentage of variance accounted for by the treatment effect.

Purchase this Solution
Solution Summary

The solution provides step by step method for the calculation of testing of hypothesis, Cohen's d, effect size and pooled variance. Formula for the calculation and Interpretations of the results are also included. Interactive excel sheet is included. The user can edit the inputs and obtain the complete results for a new set of data.

Purchase this Solution
Free BrainMass Quizzes
Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.

Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

View More Free Quizzes
Related BrainMass Solutions

  • Hypothesis Testing, Power of Hypothesis Testing & Cohen's d

    329335 Hypothesis Testing, Power of Hypothesis Testing & Cohen's d 2. The value of the z-score in a hypothesis test is influenced by a variety of factors.

  • Hypothesis Testing, Cohen's d & Power

    Compute Cohen's d to evaluate the size of the treatment effect. b. If the sample size were n =36, what value would be obtained for Cohen's d? How does sample size influence the measure of effect size? c.

  • Six basic statistics questions regrading hypothesis testing

    Cohen's d=(63-60)/6=0.5 6. the probability of rejecting a false null hypothesis The solution gives detailed steps on explaining 6 basic statistics questions including hypothesis testing, power of test, cohen's d coefficient and so on.

  • Hypothesis Testing & Cohen's d: Humidity & eating behaviour

    Please see the answers in the attachment The solution provides step by step method for the calculation of testing of hypothesis, Cohen's d and effect size. Formula for the calculation and Interpretations of the results are also included.

  • Cohen's d & Power of a Hypothesis Test

    Compare Cohen's d to evaluate the size of the treatment effect. b. If the sample size were n = 36, what value would be obtained for Cohen's d? How does sample size influence the measure of effect size? c.

  • Normal Distribution, Hypothesis tests

    We have seen that with sample size =4, we accept the null hypothesis, but with n=25, we reject the null hypothesis Cohen's d measures Effect Size.

  • Statistics Problems

    b. assuming sd=2, compute Cohen's d to measure the effect size for a sample mean of M =42. c. assuming sd =8, compute Cohen's d to measure the effect size for a sample mean of M=48.

  • Hypothesis Testing & Cohen's d

    Compute the estimated Cohen's d to measure the size of the treatment effect. c. Write a sentence that demonstrates how the outcome of the hypothesis test and the measure of effect size would appear in a research report.

  • Tattoos and Attractiveness

    Compute Cohen's d to measure the size of the effect. Round to three decimal places. ______ Describe the outcome of the hypothesis test, and the measure of effect size as it would appear in a research report.

View More Related Solutions