Homoscedasticity is the assumption that there is an equal variance of data points dispersed along the regression line.

A researcher wants to know the probability of being named on the honor roll from a population where 8% of students are on the honor roll. If the researcher selects a sample of 400 students, then what is the mean number of students expected to be on the honor roll? Hint: This is a binomial distribution, where p = 0.08 and q = 0.92.

A binomial probability distribution is the distribution of random outcomes for a bivariate or dichotomous random variable.

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?

If all scores in a distribution are negative values, then the standard deviation will also be a negative value.

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 researcher decides to split scores on an exam into quartiles. She determines that a score of 64 is at the 25th percentile, a score of 74 is at the 50th percentile, and a score of 80 is at the 75th percentile. What is the interquartile range (IQR) for these data?

A researcher computes an analysis of regression with 1 and 18 degrees of freedom. If F = 3.05, then the decision will be that X is a significant predictor of variation in Y.

One step to hypothesis testing is to set the criteria for a decision.

Researchers generally aim to maximize the power of a decision.