Basics Of Statistics

• Points30

• Questions10

• Time Limit45 Minutes

• Allowed AttemptsUnlimited

Instructions

The quiz:

• Covers the Textbookmaterial from Module 2.
• Contains10 multiple-choice
• Is limitedto 45 minutes.
• Allowsunlimited attempts and the highest attempt will count towards the grade.
• Is worth 30 points.

TAKE THE QUIZ AGAIN

Attempt History

 Attempt Time Score LATEST Attempt 1

Question 1

3 / 3 pts

Which of the following is needed to calculate confidence interval’s upper limit?

Correct!

SEM

SS

each score value

s2

Question 2

0 / 3 pts

In order to calculate the mean you must:

have at least interval level of measurement

divide by degrees of freedom

take the square root of the sum

multiply each score by itself

Question 3

3 / 3 pts

The standard error of the mean is conceptually similar to:

Correct!

the standard deviation

variance

sum of squared deviations

causal inference

Question 4

3 / 3 pts

The t distribution and the z distribution are:

Correct!

symmetrical

random

leptokurtic

biased

Question 5

3 / 3 pts

A statistic of the sample is an estimate of:

Correct!

the parameter in the theoretical population

the statistic in the second sample

the parameter in the theoretical sample

the parameter in the second sample

Question 6

3 / 3 pts

For every statistic (e.g., mean) a researcher calculates in her sample, she is estimating that same value in the:

Correct!

population

second sample

experimental sample

distribution

Question 7

3 / 3 pts

All of the following calculations are necessary for calculating s except for:

Correct!

t critical

mean

sum of squared deviations

variance

Question 8

3 / 3 pts

We use a t critical when the population is:

Correct!

theoretical

known

skewed

biased

Question 9

3 / 3 pts

z  and t distributions are known because:

Correct!

statisticians developed\discovered them

Karl Pearson developed them

they have always been

they measure variance

Question 10

3 / 3 pts

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