Which of the following statements best reflects properties of thestandard error of the mean?

Group of answer choices

all of these statements are true.

it is the standard deviation of the sampling distribution

it can never be as large as the standard deviation for the distribution of individual scores

it is used in theztestformula

Given that on one section of the SAT the mean is 500 and the standard deviation is 100, what is the approximate probability of a student scoring 700or higheron the test?

Group of answer choices

0.98

0.02

0.12

0.75

In a recent study, researchers concluded that exercise significantly lowered stress levels. What the researchers were unaware of, however, was that several of the participants in the exercise group were also taking anti-anxiety medications. The researchers' conclusion is a(n) _____ error.

Group of answer choices

Type II

Type I

null hypothesis

alternative hypothesis