DA Statistical Analysis 2

Question 1

What is the interquartile range (IQR)?

Accepted Answer

The difference between Q3 and Q1

Answer

The range of the entire dataset

Answer

The median minus the mean

Answer

The variance divided by the mean

Question 2

What type of analysis examines the relationship between a dependent variable and one or more independent variables?

Accepted Answer

Regression analysis

Answer

Cluster analysis

Answer

Factor analysis

Answer

Time series analysis

Question 3

In a box plot, what does the line inside the box represent?

Accepted Answer

Median

Answer

Mean

Answer

Mode

Answer

Standard deviation

Question 4

What is Type I error in hypothesis testing?

Accepted Answer

Rejecting a true null hypothesis

Answer

Failing to reject a false null hypothesis

Answer

Accepting an incorrect alternative hypothesis

Answer

Using too small a sample size

Question 5

Which test is appropriate for comparing proportions between two independent groups?

Accepted Answer

Chi-square test

Answer

Paired t-test

Answer

ANOVA

Answer

F-test

Question 6

What does R-squared measure in a regression model?

Accepted Answer

The proportion of variance in the dependent variable explained by the model

Answer

The slope of the regression line

Answer

The statistical significance of predictors

Answer

The residual error of predictions