Bivariate and Univariate Data Revision

The value of r-correlation coefficient is always:

Pearson's correlation coefficient is used to

• find the standard deviation of the response variable

• find how strongly two variables are associated

• how good looking the scatterplot is

• the gradient of the regression line

The correlation coefficient of -0.95 implies

• strong positive association

• weak negative association

• weak non-linear association

• strong negative association

Estimate the correlation coefficient of

the scatter plot shown above

• 0.75

• -0.99

• 0.13

• -0.88

Which of the following statements is correct?

• x axis stands for Explanatory variable and y axis stands for Response variable.

• Scatter plots can be used to describe relationships between categorical data.

• Explanatory variable should be on the y axis

• Response variable should be on the x axis

From a box plot, you cannot find

• the median

• the mean

• the range

• the third quartile

The median age of males in a town getting married is 32 years old. Which of the following is correct?

• All males get married after 32 years old.

• The average marriage age is 32 years old.

• Less than 50% of males do not get married before 32.

• 32% of males are married in this town.

The shape of the box plot is

• symmetrical

• spread out

• negatively skewed

• positively skewed