Question

One sample has n = 20 with SS = 1640, and a second sample has n...

One sample has n = 20 with SS = 1640, and a second sample has n = 15 with SS = 1724.

(a) Find the pooled variance for the two samples. (Use 3 decimal places.)


(b) Compute the estimated standard error for the sample mean difference. (Use 3 decimal places.)


(c) If the sample mean difference (M1 - M2) is 6 points, is this enough to reject the null hypothesis and conclude that there is a significant difference for a two-tailed test at the 0.01 level? (Use 3 decimal places.)

t-critical = ±
t =

Fail to reject the null hypothesis, there is a significant mean difference.

Fail to reject the null hypothesis, there is not a significant mean difference.  

  Reject the null hypothesis, there is not a significant mean difference.

Reject the null hypothesis, there is a significant mean difference.

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
One sample has n = 18 with SS = 5,471, and a second sample has n...
One sample has n = 18 with SS = 5,471, and a second sample has n = 18 with SS = = 5,545. Find the pooled variance for the two samples. S2p = ________ Compute the estimated standard error for the sample mean difference. S(m1-m2) = ___________ If the sample mean difference is 12.00 points, is this enough to reject the null hypothesis and conclude that there is a significant difference for a two-tailed test at the .05 level? (Use...
A group of researchers wants to examine whether taking multiple practice quizzes improve scores on tests....
A group of researchers wants to examine whether taking multiple practice quizzes improve scores on tests. They compare the exam scores for a sample of n1 = 12 students who took multiple practice quizzes with the test scores of a sample of n2 = 10 students who did not do any practice quizzes. Results of the study revealed that the practice quiz group had M1 = 95, SS1 = 52. The no quiz group had M2 = 92, SS2 =...
The following data summarize the results from an independent measures study comparing three treatment conditions. I...
The following data summarize the results from an independent measures study comparing three treatment conditions. I II III n = 6 n = 6 n = 6                    M = 4 M = 5 M = 6 N = 18 T = 24 T = 30 T = 36 G = 90 SS = 30 SS = 35 SS = 40 ΣX2tot = 567 Use an ANOVA with α = .05 to determine whether there are any significant differences among the...
One sample has SS = 44 and a second sample has SS = 40. Let's say...
One sample has SS = 44 and a second sample has SS = 40. Let's say that n = 8 for both samples. If we were to calculate the the two sample variances, they would be: s12 = 6.286 and s22 = 5.714. (a) Calculate the pooled variance. Because the samples are the same size, you should find that the pooled variance is exactly halfway between the two sample variances. (Use 3 decimal places.) sp2 = Now assume that n1...
The following data were obtained from an independent-measures research study comparing three treatment conditions. I II...
The following data were obtained from an independent-measures research study comparing three treatment conditions. I II III n = 6 n = 4 n = 4                    M = 2 M = 2.5 M = 5 N = 14 T = 12 T = 10 T = 20 G = 42 SS = 14 SS = 9 SS = 10 ΣX2tot = 182 Use an ANOVA with α = .05 to determine whether there are any significant mean differences among the...
The following data were obtained from an independent-measures research study comparing three treatment conditions. I II...
The following data were obtained from an independent-measures research study comparing three treatment conditions. I II III n = 6 n = 4 n = 4                    M = 2 M = 2.5 M = 5 N = 14 T = 12 T = 10 T = 20 G = 42 SS = 14 SS = 9 SS = 10 ΣX2tot = 182 Use an ANOVA with α = .05 to determine whether there are any significant mean differences among the...
A researcher wants to evaluate the pain relief effectiveness of a new medication for chronic pain...
A researcher wants to evaluate the pain relief effectiveness of a new medication for chronic pain sufferers. Using a pain scale from 0 to 10 (where 0 = no pain at all, and 10 = the most pain you can imagine), she compares the pain level for a sample of n1 = 4 people who received the new medication, with the pain level for a sample of n2 = 4 people who received a placebo. The data are as follows:...
If a random sample of 27 homes south of Center Street in Provo has a mean...
If a random sample of 27 homes south of Center Street in Provo has a mean selling price of $145,150 and a standard deviation of $4775, and a random sample of 29 homes north of Center Street has a mean selling price of $148,300 and a standard deviation of $5775, can you conclude that there is a significant difference between the selling price of homes in these two areas of Provo at the 0.05 level? Assume normality. (a) Find t....
1a The following data were obtained from an independent-measures research study comparing three treatment conditions. I...
1a The following data were obtained from an independent-measures research study comparing three treatment conditions. I II III 2 5 7 5 2 3 0 1 6 1 2 4 2 2 T =12 T =10 T =20 G = 42 SS =14 SS =9 SS =10 ΣX2= 182 Use an ANOVA with α = .05 to determine whether there are any significant mean differences among the treatments. The null hypothesis in words is Group of answer choices a. There...
The one sample t-test from a sample of n = 19 observations for the two-sided (two-tailed)...
The one sample t-test from a sample of n = 19 observations for the two-sided (two-tailed) test of H0: μ = 6 H1: μ ≠ 6 Has a t test statistic value = 1.93. You may assume that the original population from which the sample was taken is symmetric and fairly Normal. Computer output for a t test: One-Sample T: Test of mu = 6 vs not = 6 N    Mean    StDev    SE Mean    95% CI            T       P 19 6.200     ...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT