DSST Statistics 4

Question 1

A fair coin is flipped 10 times. The probability of exactly 3 heads follows which distribution?

Accepted Answer

Binomial

Answer

Fixed trials, constant probability of success, and two outcomes define a binomial distribution.

Question 2

Which of the following is a characteristic of the normal distribution?

Accepted Answer

Mean, median, and mode are all equal

Answer

The normal distribution is perfectly symmetric, so its mean, median, and mode coincide.

Question 3

An ANOVA test is used to compare:

Accepted Answer

Three or more group means

Answer

Analysis of Variance (ANOVA) tests whether the means of three or more groups are equal.

Question 4

Bayes' theorem is used to:

Accepted Answer

Update probability estimates given new evidence

Answer

Bayes' theorem allows you to revise a prior probability in light of new data to get a posterior probability.

Question 5

Which of the following sampling methods divides the population into subgroups and samples from each?

Accepted Answer

Stratified sampling

Answer

Stratified sampling splits the population into strata (subgroups) and draws random samples from each.

DSST - DANTES Subject Standardized Tests Practice Test