Blog

If the coefficient of determination is .09 and the sum of squares regression is 88, then the total variation in Y must be SSY = 108.

A matched-pairs design is one example of a situation in which it is appropriate to use the estimation formula for the related samples t.

The value of power is influenced by the alpha level, sample size, and effect size.

A researcher randomly assigns 24 participants to one of four groups. At a .05 level of significance, the critical value for a one-way between-subjects ANOVA is 3.49.

The coefficient of determination is mathematically equivalent to h2.

A researcher measures the relationship between narcissism and willingness to help. If SSXY = 240, SSX = 320, and SSY = 410, then what is the value of the correlation coefficient?

A professor finds that the average SAT score among all students attending his college is 1,150 ± 150 (m ± s). He polls his class of 25 students and finds that the average SAT score is 1,200. Suppose he computes a one-sample z test at a .05 level of significance. What is his decision?

The greater the power, the more likely we are to correctly reject the null hypothesis, if it is incorrect.

A researcher wants to know the probability of selecting a student athlete from a school population where 5% of students are athletes. If the researcher selects a sample of 120 students, is it appropriate to use the normal approximation of the binomial distribution to estimate this probability?

A researcher measures mating displays among 12 birds randomly assigned to be in the presence of no cue, an auditory cue, or a visual cue. The degrees of freedom for this one-way between-subjects ANOVA are 2 and 9.