Liberty University - EDCO 735 / EDCO735 QUIZ 2 4th attempt

EDCO 735 / EDCO735 QUIZ 2 4th attempt Which of the following is NOT needed in the formula for calculating a confidence interval's upper limit? M SS tcritical SEM In order to calculate the sum of squared deviations you must: Correct Answer calculate the mean Correct Answer divide by degrees of freedom take the square root of the sum multiply each score by itself Warner - Section 2.4 Variance: is a measure of dispersion tells us about how far any given score in the population can be expected to be from the mean is calculated by dividing the SS by the sample size is biased when calculated by df s is all of the following except: Correct Answer is biased Correct Answer is a measure of dispersion tells us about how far any given score in the population can be expected to be from the mean is the square root of variance Warner - Section 2.4 - 2.6 When different sets of data of the same size are randomly chosen from a population, the resulting variation in values is called: Correct! sampling error standard deviation magnitude of error confidence interval A two-tailed outlier for the Z distribution must have a Z score equivalent to the: Correct! highest 2.5% or lowest 2.5% of the z distribution only the highest 5% of the z distribution only the lowest 5% of the z distribution highest 5% or lowest 5% of the z distribution In order to calculate the mean you must: Correct! divide by the sample size have at least ratio level of measurement have a normal distribution use a representative sample As sample size increases while all other things are constant, the confidence interval: decreases increases remains constant it can increase or decrease Sampling error: depends on sample size is the s is large when we have a diverse population is smaller the more educated the sample The standard error is related to all of the following except: causal inference dependent on sample size is smaller with a larger sample involves the confidence interval This attempt took 33 minutes. 35 Quiz 2 27 of 30 4th attemp