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A researcher rejected the null where r(146) = .148, p = .03 and concluded that the effect size was __________.
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- A researcher conducts an independent-measures study comparing two treatments and reports the t statistic as t(25)=2.071 . How many individuals participated in the entire study? Using a two-tailed test with αα=.05 , is there a significant difference between the two treatments? Compute r2 to measure the percentage of variance accounted for by the treatment effect.Students participated in a study of the relationship between confidence and college success, with the results, r = .78, indicating that 61% of the variance in college success was accounted for by the students’ confidence. Upon learning this, your statistics classmate decided that if he worked to increase his confidence, he would certainly become more successful in college. What would you say to him in response to his idea?A researcher conducts an independent- measures research study and obtains t = 2.070 with df = 28. How many individuals participated in the entire research study? Using a two- tailed test with α = .05, is there a significant difference between the two treatment conditions? Compute r2 to measure the percentage of variance accounted for by the treatment effect.
- A sample of 12 scores has a variance of s2 = 48. What is the estimated standard error for the samplemeanPrior 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?The authors of this study report a Pearson correlation coefficient estimate of r = 0.23 with a p-value of <0.01. Interpret.