Liberty University - EDCO 735 / EDCO735 QUIZ 2 5th attempt

EDCO 735 / EDCO735 QUIZ 2 5th attempt The difference between the population mean and the sample mean that arise just by chance rerepsents the: sampling error standard error magnitude of the difference prediction error Sampling error refers to: about how much we should expect our sample mean to be from the population mean about how much we should expect an individual score in our sample to be from the population mean the amount of error in our measurement how representative our sample is In order to calculate the sum of squared deviations you must: calculate the mean divide by degrees of freedom take the square root of the sum multiply each score by itself Calculating the sample standard deviation always makes use of: variance random sample convenience sample nominal level of measurement We use a t critical when the population is: theoretical known skewed biased A two-tailed outlier for the Z distribution must have a Z score equivalent to the: 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 When different sets of data of the same size are randomly chosen from a population, the resulting variation in values is called: sampling error standard deviation magnitude of error confidence interval All of the following calculations are necessary for calculating s except for: t critical mean sum of squared deviations variance A one-tailed outlier for the Z distribution must have a Z score equivalent to the: Correct Answer highest 5% or lowest 5% of the z distribution Correct answer highest 2.5% or lowest 2.5% of the z distribution the highest 5% of the z distribution only the lowest 5% of the z distribution only Warner - Section 2.8 In study of a new treatment for depression, a researcher compares the new treatment on a group of patients with major depression with a second group that are treated with the standard treatment as usual. How many theoretical populations is the researcher estimating depression for? two none three