The values in the following matrix are treatment means from a two-factor study. One of the means is missing. What value for the missing mean would most likely result in no main effect for factor A? B1 B2 A1 9 5 A2 7 ?
A sample of n = 100 scores is selected from a population wit…
A sample of n = 100 scores is selected from a population with M = 80 with s = 20. On average, how much error is expected between the sample mean and the population mean?
A Pearson correlation is computed for a sample of n = 18 pai…
A Pearson correlation is computed for a sample of n = 18 pairs of X and Y values. What correlations are statistically significant with a = .05, two tails?
A repeated-measures experiment compares three treatment cond…
A repeated-measures experiment compares three treatment conditions with a sample of 10 participants. If the data are analyzed with ANOVA, the analysis would have dftotal = ____.
A chi-square test for independence is being used to evaluate…
A chi-square test for independence is being used to evaluate the relationship between two variables, one of which is classified into three categories and the second of which is classified into four categories. The chi-square statistic for this test would have df equal to ____.
A 99% confidence interval for the population mean ranges fro…
A 99% confidence interval for the population mean ranges from 46 to 50. Based on this information:
A sample of n = 8 scores has SS = 50. If these same scores…
A sample of n = 8 scores has SS = 50. If these same scores were a population, then the SS value for the population would be ____.
What is an example of a nominal variable?
What is an example of a nominal variable?
A population with µ = 85 and σ = 12 is transformed into z-sc…
A population with µ = 85 and σ = 12 is transformed into z-scores. After the transformation, what is the standard deviation for the population of z-scores?
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. She has half of the second-grade students use the new reading program for the first half of the school year and use the current reading program for the second half of the year. The other half of the second-grade students use the current reading program for the first half of the school year and use the new reading program for the second half of the year. The researcher plans to use the data from this study to test whether the new program has had a significant effect on reading scores. Which of the following hypothesis tests would be appropriate?