Question

A researcher believes that a new treatment will decrease scores. A random sample is selected from...

A researcher believes that a new treatment will decrease scores. A random sample is selected from a normal population with μ = 60 and σ = 15. After a treatment is administered to 25 individuals in the sample, the sample mean is found to be M = 57. Did the treatment significantly decrease scores? (13 points)

A. IV

DV

B. Inferential proof with the 7 steps.


Math   Statistics-And-Probability   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A random sample is selected from a normal population with a mean of μ = 20...
A random sample is selected from a normal population with a mean of μ = 20 and a standard deviation of σ =5 10. After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 25. If the sample consists of n = 25 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with alpha = .05.
A random sample is selected from a normal popula-tion with a mean of μ = 40...
A random sample is selected from a normal popula-tion with a mean of μ = 40 and a standard deviation of σ = 10. After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 46. How large a sample is necessary for this sample mean to be statistically significant? Assume a two-tailed test with alpha = .05.
A random sample is selected from a normal population with a mean of μ=50 and a...
A random sample is selected from a normal population with a mean of μ=50 and a standard deviation of σ=12. After a treatment is administered to the individuals in the sample, the sample mean is found to be M=55. a. If the sample consists of n=16 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with α =0.05. b. If the sample consists of n=36 scores, is the sample mean...
A random sample is selected form a normal population with a mean of μ = 40...
A random sample is selected form a normal population with a mean of μ = 40 and a standard deviation of σ = 10. After a treatment is administered to the individuals in the sample, the sample mean is found to be M = 46. a. How large a sample is necessary for this sample mean to be statistically significant? (Assume a two-tailed test with α = 0.05) b. If the sample mean were M = 43, what sample size...
A random sample is selected from a normal population with a mean of µ = 30...
A random sample is selected from a normal population with a mean of µ = 30 and a standard deviation of σ= 8. After a treatment is administered to the individuals in the sample, the sample mean is found to be x̅ =33. Furthermore, if the sample consists of n = 64 scores, is the sample mean sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with α = .05. 4a. Which of the following...
A researcher selects a sample of n = 100 from a normal population with µ =...
A researcher selects a sample of n = 100 from a normal population with µ = 50 and σ = 30. If the treatment is expected to decrease scores by 10 points, what is the power of a two-tailed hypothesis test using α = .05?
A sample of students is selected from a population with µ = 50. After a treatment...
A sample of students is selected from a population with µ = 50. After a treatment is administered to the individuals in the sample, the mean is found to be M = 55 and the variance is s2 = 64. If the sample has n = 16 scores, then conduct a hypothesis test to evaluate the significance of the treatment effect. Use a two-tailed test with α = .05. What are the Hypotheses? What is the df? What is the...
A sample is randomly selected from a population with a mean of μ = 50, and...
A sample is randomly selected from a population with a mean of μ = 50, and a treatment is administered to the individuals in the sample. After treatment, the sample is found to have a mean of M = 56 with a standard deviation of s = 8. If there are n = 4 individuals in the sample, are the data sufficient to reject Ho and conclude that the treatment has a significant effect using a two-tailed test with =...
A sample of n=18 individuals is selected from a population with a mean of µ=77, and...
A sample of n=18 individuals is selected from a population with a mean of µ=77, and a treatment is administered to the individuals in the sample. A treatment is administered to the individuals in the sample and after treatment, the sample variance is found to be s2=144. a. If the treatment has a 3-point effect and produces a sample mean of M=80, is this sufficient to conclude that there is a significant treatment effect effect using a two-tailed test with...
A researcher selects a sample of sixteen individuals from a normal population with a mean of...
A researcher selects a sample of sixteen individuals from a normal population with a mean of µ = 40 and σ = 8. A treatment is administered to the sample and, after treatment, the sample mean is 43. If the researcher uses a hypothesis test to evaluate the treatment effect, what z-score would be obtained for this sample (z-test value obtained)? Does the scenario Question #1 described a directional test? What would be the critical value for comparison? (Use α...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT