6. Data Analysis and Modeling

Descriptive Stats — Quiz

Test your understanding of descriptive stats with 5 practice questions.

Practice Questions

Question 1

Given the following frequency distribution of values $2,4,6,8$ with frequencies $3,5,2,4 respectively, what is the mean?

Question 2

Given the data set \\{3,5,7,9,11,13,15\\}, what are $Q_1$, median, $Q_3$, and interquartile range (IQR)?

Question 3

According to Chebyshev’s theorem, at least what proportion of any data set lies within two standard deviations of the mean?

Question 4

If each data value $X$ is transformed by $Y=4X-3$, how do the mean and variance change?

Question 5

For the data set \\{3,5,7,9,11,13,50\\}, which value is considered a mild outlier using the 1.5×IQR rule?