Statistics Quizzes

1.26

A researcher wants to know if people who subscribe to Netflix are happier than people in the general population. Assume happiness in the population is normally distributed with a mean of 50 and a standard deviation of 20. The researcher collects a sample of 10 Netflix subscribers and finds a mean happiness score of 58. Calculate the z-test statistic.

5.71

A researcher wants to know whether college students are more anxious than people in the general population. Assume anxiety in the population is normally distributed with a mean of 7 and a standard deviation of 3.5. The researcher collects a sample of 100 college students and finds a mean anxiety score of 9. Calculate the z-test statistic.

0.22

Calculate the correlation between the following two variables: Variable 1: 1, 3, 2, 5, 4, 2 Variable 2: 7, 10, 3, 7, 4, 1

0.86

Calculate the correlation between the following two variables: Variable 1: 5, 7, 10, 3, 5, 1 Variable 2: 6, 9, 9, 1, 4, 3

0.27

Calculate the correlation between the following two variables: Variable 1: 6, 9, 9, 1, 4, 3 Variable 2: 7, 10, 3, 7, 4, 1

3

Calculate the mode for the following dataset: 8, 9, 14, 3, 10, 16, 13, 10, 3, 4, 3, 3

Any observed differences are likely due to sampling error and a real effect in the population.

If we reject the null hypothesis (in favor of the alternative), this is akin to saying what?

0.75

Two researches observing how often a child laughs agree on 6 trials and disagree on 2. What is their interrater reliability?

0.82

What is the internal consistency for the scale below? Item 1 scores: 2, 5, 3, 7, 9 Item 2 scores: 3, 7, 4, 6, 8 Item 3 scores: 3, 4, 1, 2, 4

Test-retest reliability

Which form of reliability is used when you want to determine whether a measurement tool (e.g., a scale or test) is reliable over time?

(c)

Which of the following do alpha levels NOT directly determine? (a)What p-values are required to call a finding significant. (b) How extreme of a sample we would need to collect to reject the null hypothesis. (c) The values we will use when establishing our null and alternative hypotheses. (d) The boundaries of our critical regions.

(a)

Which of the following is NOT an appropriate way to represent the mean? (a) σ (b) µ (c) x̅ (d) M

(d)

Which of the following is the key factor that differentiates ordinal from nominal scales of measurement? (a) The distance between items on ordinal scales is always equal, whereas the distance between items on nominal scales is not. (b) Ordinal scales cannot be qualitative, whereas nominal ones can. (c) Ordinal scales have a true zero point, whereas nominal ones do not. (d) Items on an ordinal scale progress in a meaningful direction, whereas items on a nominal scale do not.

(d)

Which of the following is true regarding the relationship between the median and the mode of the distribution depicted below? (a) there is not enough information to be able to tell (b) the median will be greater than the mode (c) the median will equal the mode (d) the median will be less than the mode

(a)

Which of the following is true regarding the relationship between the median and the mode of the distribution depicted below? (a) the median will equal the mode (b) the median will be less than the mode (c) there is not enough information to be able to tell (d) the median will be greater than the mode

ε

Which symbol is used to represent sampling error?