Fusella (1970) had participants watch a screen, looking for brief presentations of a small blue arrow. On some trials, the participants were also asked to form a mental image. The number of errors in the task was counted. The results for a sample of n = 6, show that  MD = 10 The difference score had SS = 80. Do the data indicate a significant difference between the two conditions: forming a mental image and not forming a mental image? Use a two-tailed test with α = .01 a. The t-statistic is b. Compute EstimatedCohen’s d Cohen's d = c. Your decision is

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.