A researcher selects a sample of n=25 individuals from a population with a mean of μ=60 and standard deviation of σ=10 and administers a treatment. The researcher predicts that the treatment will increase scores. Following the treatment, the average score for this sample is M=65 With a one-tail a= 0.05, state the conclusion of these findings. Calculate Cohen’s d and state the effect size (i.e., small, medium, large).

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A: Solution:

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A: Given  σ2=1.36, n=16, s2=1.27, ɑ=0.01

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A:

Q: 4. A random sample of 25 "Quarter Pounders" yields a mean weight of X = 0.208 pounds, with a sample…

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Q: A snack food manufacturer estimates that the variance of the number of grams of carbohydrates in…

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Q: Let X~N(0, 0?). Find the CRLB for variances of the unbiased estimator of T(0)= 0²

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A: The Formula for z value is : z=Xˉ1−Xˉ2- (μ1-μ2)σ12n1+σ22n2

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Q: In a test of H0: µ=10 against HA: µ<10, a sample of size 100 produces Z = -2.01 for the value of…

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Q: A random sample of six steel beams has mean compressive strength of 58.392 psi (pounds per = 648…

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Q: A snack food manufacturer estimates that the variance of the number of grams of carbohydrates in…

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