An analysis of variances produces dftotal = 29 and dfwithin = 27. For this analysis, what is dfbetween?
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A researcher would like to evaluate the effect of a new read…
A researcher would like to evaluate the effect of a new reading program for second-grade students. For the past five years, a standardized test given at the end of second grade has produced a mean score of µ = 45. A sample of n = 25 students are placed in the new program and at the end of the school year they obtain a mean test score of M = 51, s = 20. The researcher plans to use these data to test whether the new program has had a significant effect on reading scores. Which of the following hypothesis tests would be appropriate?
An independent-measures research study uses two samples, eac…
An independent-measures research study uses two samples, each with n = 22, to compare two treatments. If the results are evaluated with a t statistic using a two-tailed test with α = .01, then what are the boundaries for the critical region?
What term is used to describe the shape of a distribution in…
What term is used to describe the shape of a distribution in which the scores pile up on the left-hand side of the graph and taper off to the right?
The following table shows the results of an analysis of vari…
The following table shows the results of an analysis of variance comparing two treatment conditions with a sample of n = 11 participants in each treatment. Note that several values are missing in the table. What is the missing value for the F-ratio?Source SS df MS Between xx xx 14 F = xxWithin xx xx xxTotal 154 xx
A repeated-measures study uses a sample of 10 participants t…
A repeated-measures study uses a sample of 10 participants to evaluate the mean differences among four treatment conditions. In the analysis of variance for this study, what is the value for dfbetween subjects?
A sample of n = 20 scores is transformed into z-scores. Wha…
A sample of n = 20 scores is transformed into z-scores. What is the mean for the set of 20 z-scores?
Under what circumstances is a score that is 5 points above t…
Under what circumstances is a score that is 5 points above the mean considered a central value–meaning it is relatively close to the mean?
A population of scores has µ = 44. In this population, a sc…
A population of scores has µ = 44. In this population, a score of X = 40 corresponds to z = –0.50. What is the population standard deviation?
What is the critical value for a correlation with n=20, one-…
What is the critical value for a correlation with n=20, one-tailed, and an alpha level of 0.05?