Pre-test Descriptive and Probability

What is the fourth type of descriptive statistics that allows for a full description of a sample? Central tendency (median, mean, etc), Position (percentile etc), Frequency (counts), and ... ?

• Dispersion

• Difference

• Percentages

• Mode

The value that occurs most frequently is also called the ....

The mean is very sensitive to ...

The difference between 75th percentile and 25th percentile is also called:

• A quantile

• A quartile

• The interquartile Range

• A median

This plot is called:

• Stem and leaf plot

• Class interval frequency

• Frequency polygon

• Ranked plot

Name two tests of normality.

• Shapiro-Wilk

• Mann-Whitney

• LaPlace-Gauss

• Kolmogorov-Smirnov

You roll a six-sided die. Event A is getting an even number. Event B is getting a number greater than 3. What is the probability of the intersection of events A and B?

• 1/6

• 2/6

• 3/6

• 4/6

You have a bag containing 5 red balls and 3 green balls. You draw 2 balls without replacement. Let Event A be drawing a red ball on the first draw, and Event B be drawing a green ball on the second draw. Calculate the probability of the intersection of events A and B.

• 3/7

• 3/8

• 15/64

• 15/56

If events A and B are independent, what is P(A ∩ B)?

P(A ∩B) can also be written as P(A and B).

• P(A ∩ B)=P(A) + P(B)

• P(A ∩ B)=P(A)⋅P(B)

• P(A ∩ B)=P(A)−P(B)

• P(A ∩ B)=P(A)÷P(B)

What is the non-parametric alternative to a paired t-test?

• Wilcoxon Signed Rank Test

• Mann-Whitney Test

• Spearman's Rank Test

• Kruskal-Wallis Test