Question: A random sample is obtained from a population with a mean of = 45. After a treatment is administered to the individuals in the

A random sample is obtained from a population with a mean of µ = 45. After a treatment is administered to the individuals in the sample, the sample mean is M = 49 with a standard deviation of σ = 12.
a. Assuming that the sample consists of n = 9 scores, compute r2 and the estimated Cohen's d
to measure the size of treatment effect.
b. Assuming that the sample consists of n = 16 scores, compute r2 and the estimated Cohen's d
to measure the size of treatment effect.
c. Comparing your answers from parts a and b, how does the number of scores in the sample influence the measures of effect size?

Step by Step Solution

★★★★★

3.50 Rating (170 Votes )

There are 3 Steps involved in it

1 Expert Approved Answer

Step: 1 Unlock

a With n 9 the estimated standard error is 4 and t 44 1 r 2 ... View full answer

Question Has Been Solved by an Expert!

Get step-by-step solutions from verified subject matter experts

Step: 2 Unlock

Step: 3 Unlock

Document Format (1 attachment)

568-M-S-V-A (1434).docx

120 KBs Word File

Students Have Also Explored These Related Statistics Questions!

A random sample is obtained from a population with variance 2 = 625 and the sample mean is computed. Test the null hypothesis H0: = 100 versus the alternative hypothesis H1: > 100 with = 0.05....

A random sample is obtained from a population with a variance of 2 = 400, and the sample mean is computed to be x-barc = 70. Consider the null hypothesis H0: = 80 versus the alternative hypothesis...

A random sample is obtained from a normal population with a mean of = 95 and a standard deviation of = 40. The sample mean is = 86. a. Is this a representative sample mean or an extreme value for...

7. The herbal supplement ginko biloba is advertised as producing an increase in physical strength and stamina. To test this claim, a sample of n = 36 adults is obtained and each person is instructed...

17. Gravetter/Wallnau/Forzano, Essentials - Chapter 9 - End-of-chapter question 17 A random sample is obtained from a population with a mean of u = 20. After a treatment is administered to the...

15. A random sample is obtained from a population with a mean of p. = 100, and a treatment is administered to the sample. After treatment, the sample mean is found to be M = 104 and the sample...

A random sample is obtained from a population with a mean of = 70. A treatment is administered to the individuals in the sample and, after treatment, the sample mean is M = 78 with a standard...

A random sample is obtained from a population with a mean of = 45. After a treatment is administered to the individuals in the sample, the sample mean is M = 49 with a standard deviation of s = 12....

A random sample is obtained from a population with = 80 and = 10 and a treatment is administered to the sample. Which of the following outcomes would be considered noticeably different from a...

A parallel-polarized plane wave is incident from air at an angle thetai = 30_ onto a pair of dielectric layers as shown in the figure. (a) Determine the angles of transmission theta2, theta3, and...

How much would you pay today to receive $15,000 in 8 years? Assume a 5% interest rate.

15.14 An article on the Gallup website titled SOCIAL AUDIT, Gambling in America included the following comparison of the responses of teenagers and adults to the question, Generally speaking, do you...

A material breach is the only kind that will discharge a contract; a trivial breach will not.

Briefly explain the goal for defining and measuring variability.

Anderson (1999) was interested in the effects of attention load on reaction time. Participants in her study received a dual-task procedure in which they needed to respond as quickly as possible to a...

Find the median for the following set of scores: 1, 4, 8, 7, 13, 26, 6

Tammy Monahan is considering the purchase of a home entertainment center. The product attributes she plans to consider and the weights she gives to them are as follows Portability Sound projection...

How will the cash flow of franchises be impacted by AB 257 in the following categories (provided changes are proposed and implemented in these areas)? f. Mandatory insurance levels for employees...

Assuming the data in the following table for corporate bonds, compute the average hedge ratio (duration multiplier) at the average spread level for the three credit ratings (M1,M2, AND M3)