Statistical Concepts Quiz

Question 1

When the level of significance of a hypothesis test is increased, the probability of committing a Type I error

Accepted Answer

is decreased

Question 2

The main example in hypothesis testing is based on a cup of coffee

Accepted Answer

False

Question 3

The value of a correlation is reported by a researcher to be r = −0.5. Which of the following statements is correct?

Accepted Answer

The x-variable explains 25% of the variability in the y-variable.

Question 4

Which of the following values is used as a summary measure for a sample, such as a sample mean?

Accepted Answer

Sample statistic

Question 5

The mathematician mentioned in the hypothesis testing video is

Accepted Answer

Fisher

Question 6

Type II error is an error that

Accepted Answer

fails to reject H0, given that H1 is true

Question 7

In linear regression, a good estimator of sigma is called

Accepted Answer

standard error of the estimate

Question 8

Which one of these statistics is unaffected by outliers?

Accepted Answer

Interquartile range

Question 9

One use of a regression line is

Accepted Answer

to estimate the change in y for a one-unit change in x.

Question 10

Video on regression discusses the intercept and slope

Accepted Answer

True

Question 11

The main example in the video is based on simple regression

Accepted Answer

True

Question 12

Consider a hypothesis where H0 where ϕ0 = 23 against H1 where ϕ1 < 23. The test is?

Accepted Answer

Left tailed

Question 13

Consider a hypothesis H0 where ϕ0 = 5 against H1 where ϕ1 > 5. The test is?

Accepted Answer

Right tailed

Question 14

Which of the following is a branch of statistics?

Accepted Answer

Both A and B

Questions 14