1.A sample is selected from a population with µ = 80. After a treatment is administered to the individuals, the sample mean is found to be M = 75 and

1.A sample is selected from a population with µ = 80. After a treatment is administered to the individuals, the sample mean is found to be M = 75 and the variance is s2 = 100. a. If the sample has n = 4 scores, then calculate the estimated standard error and determine whether the sample is sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with alpha = 0.05 b. If the sample has n=25 scores, then calculate the estimate standard error and determine whether the sample is sufficient to conclude that the treatment has a significant effect? Use a two-tailed test with alpha = 0.05 c. Describe how increasing the size of the sample affects he stanard erro and the likelihood of rejecting null hypothesis 2. Set 1.                                                Set 2. Subject     I          II                        Subject         I      II A            12         14                          A            12    14 B             7         17                           B            17     27 C            11        12                           C            31     33 D            10        12                           D            40     42 M=10    M=14                                    M=25    M=29 a. Is there is significant difference in performance before eating versus after eating? Use a two-tailed test with = .05. b. Compute r2 to measure the size of the effect. c. Write a sentence demonstrating how the outcome of the test and the measure of effect size would appear in a research report. 8.

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