What size samples do you need for a 2-group design if you expect to have an effect size of .50 and you want your power to be .71?
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Q: Use the effect size 0.47 to answer the following regarding a test of H0: mu1-mu2= 0 (using the .05…
A: The following information is available in the question Effect size=0.47μ1-μ2=0n1=75n2=125
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What size samples do you need for a 2-group design if you expect to have an effect size of .50 and you want your power to be .71?
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- For the following exercises, assume two die are rolled. 47. Construct a table showing the sample space.Finally, write up your results as you would see it in a results section of an empirical research paper. Make sure to include the means and SDs for smashed into and hit group (in miles). I do NOT need to see the effect size (Cohen’s D)By using an independent samples t-test, this study found that fourth year students at ONLINE UNIVERSITY Q had significantly higher salaries (M=150,000, SD=3.8) than the first year students (M=88,000, SD=2.7), t(18) = 4.68, p <.05, Is it possible to compute the effect size from the information given in the problem? Why or why not?
- figure the predicted effect size and indicate whether it is approximately small, medium, or large, for each of the following planned studies (only a, b, and c)!A glass manufacturing company wanted to investigate the effect of breakoff pressure and stopper height on the percentage of breaking off chips. The results are in the accompanying table. Complete parts (a) through (e). a. At the 0.01 level of significance is there an interaction between the breakoff pressure and the stopper height? b. is there an effect due to the breakoff pressure? c. is there an effect due to the stopper height? d. Plot the percentage breakoff for each breakoff pressure for each stopper height. e. Discuss the results of (a) through (d).Which of the following provides an estimate of the effect the variables of interest have on one another regardless of sample size? a) power b) alpha c) effect size d) p value
- For each of the following studies, (a) and (b), decide whether you can reject the null hypothesis that the groups come from identical populations. Use the .01 level. (c) Figure the effect size for each study.For a population with u=90 and o=20, a score of x=105 would correspond to a z-score ofFor a population with μ = 80 and σ = 10,the z-score corresponding to X = 85 would be?
- answer the blank please and the "These residuals do not all have the same sign because in the first two observations listed, the observed efficiency ratios were" ty!Compare the two separate scatterplots. In particular, how do the associtation compare between women with pets vs. women without pets? Does one group have more variation in systolic blood pressure than the other? If so, for which group? Does systolic blood pressure seem higher for common ages between the two groups? If so, for which group?Prior to assessment of the outcome, the researchers did a manipulation check. Members of Groups 1 and 2 rated the attractiveness (on a 1 to 9 scale, with 9 being the most attractive) of the person in the photo. They reported that for the attractive photo, M = 7.53; for the unattractive photo, M = 3.20, F(1, 108) = 184.29. Was this difference statistically significant (using a =.05)? What was the effect size for the difference in (2a)? Was their attempt to manipulate perceived attractiveness successful? Why does the F ratio in (2a) have just df=1 in the numerator?
