What percentage of students' scores fall above a Z score of 2.50?

Group of answer choices

1.33%

90.38%

0.62%

2.50%

95.44%

What percentage of students' scores fall between a Z score of -1.00 and 1.00?

Group of answer choices

54.68%

34.13%

68.26%

31.74%

31.74%

Which of these Z scores is the LEAST likely to occur?

Group of answer choices

0.02

0.99

0

2.57

-2.25

Suppose you have sample with a mean score of 10 and a standard deviation of 2.

What proportion of people are expected to have a raw score below a score of 9?

Group of answer choices

19.15

59.15

32.94

30.85

A researcher hypothesizes that middle school students (group 1) will report different average stress than high school students (group 2). Which of the following reflects the researcher's alternative hypothesis (also known as a research hypothesis)?

Group of answer choices

H1: Xbar1 > Xbar2

H0: 1 = 2

H1: Xbar1 =/= Xbar2

H1: Xbar1 < Xbar2

A researcher hypothesizes that teens will be more likely to use condoms after a class about the health risks of unprotected sex compared to before. Likelihood is rated on a 1-10 scale.

Which test BEST fits for this study?

Group of answer choices

ANOVA

regression

dependent samples t-test with a two-tailed test of significance

independent samples t-test with a one-tailed test of significance

independent samples t-test with a two-tailed test of significance

dependent samples t-test with a one-tailed test of significance

A researcher hypothesizes that hours of exercise will be useful in guessing individual stress levels. Stress is rated on a 1-5 scale.

Which test BEST fits this study

Group of answer choices

independent samples t-test with a one-tailed test of significance

correlation with a one-tailed test of significance

independent samples t-test with a two-tailed test of significance

ANOVA

correlation with a two-tailed test of significance

regression

There is no appropriate test for this scenario

A researcher hypothesizes that hours spent exercising will positively relate to happiness. Happiness is rated on a 1-5 scale.

Which test BEST fits for this study?

Group of answer choices

correlation with a one-tailed test of significance

ANOVA

independent samples t-test with a one-tailed test of significance

independent samples t-test with a two-tailed test of significance

correlation with a two-tailed test of significance

Regression

There is no appropriate test for this scenario