Question

A. To examine relationships between a categorical and a numerical variable, we can use

	a.	counts and corresponding charts of the counts
	b.	scatterplots
	c.	correlation matrices
	d.	box-whisker plots

B. Coding all Business majors as 1 and all others as 0 in a data set illustrates the use of

	a.	numerical variables
	b.	dummy variables
	c.	ordinal variables
	d.	nominal variables

C. Abby has been keeping track of what she spends on Starbucks coffee. The last seven week's expenditures, in dollars, were 6, 12, 14, 10, 15, 12, and 8. The average amount Abby spends on Starbucks is $11. True of false.

D.  A sample of 25 observations has a standard deviation of 10. The sum of the squared deviations from the sample mean is

	a.	475
	b.	400
	c.	500
	d.	2400
	e.	2500

Answer 1

To examine relationships between a categorical and a numerical variable, we can use

box-whisker plots

Coding all Business majors as 1 and all others as 0 in a data set illustrates the use of

dummy variables

The average amount Abby spends on Starbucks is = (6 + 12 + 14 + 10 + 15 + 12 + 8)/7 = 11

True

standard deviation = (sum of the squared deviations from the sample mean / (25-1)) ^ 0.5

i.e 100 =  sum of the squared deviations from the sample mean / 24

i.e sum of the squared deviations from the sample mean = 2400

If you like the solution, please hit the like button. If you find any problem regarding the solution, please mention in the comments section.