Question

PART I

For each of the following variables, identify an appropriate graph or chart that could be used.
(I) Income tax brackets (e.g. Below $8925, $8925-36250, $36250-$87850, etc)
(II) Car safety rating given by safercar.gov (e.g. one star, two stars, up to 5 stars)

	1) (I) Histogram , and (II) Histogram
	2) (I) Bar graph , and (II) Bar graph
	3) (I) Histogram , and (II) Pie chart
	4) (I) Boxplot , and (II) Histogram
	5) (I) Pie chart , and (II) Stem-and-leaf display

PART II

For each of the following variables, identify the type of variable (categorical vs. numeric).
(I) Car safety rating given by safercar.gov (e.g. one star, two stars, up to 5 stars)
(II) Traffic congestion (e.g. light, medium, heavy)

	1) (I) Categorical , and (II) Numeric
	2) (I) Numeric , and (II) Numeric
	3) There is no correct match.
	4) (I) Categorical , and (II) Categorical
	5) (I) Numeric , and (II) Categorical

PART III

Suppose that the average and standard deviation of the shelf life in years for certain kinds of batteries are 14.79 and 2.67, respectively. Calculate an interval that is symmetric around the mean such that it contains approximately 68% of battery shelf lives. Assume that the life has a normal distribution.

	1) (17.46, 12.12)
	2) (20.13, 9.45)
	3) (12.12, 17.46)
	4) (14.79, 2.67)
	5) (9.45, 20.13)

Answer 1

PART I )

(I) Bar graph , and (II) Bar graph

PART II )

(I) Categorical , and (II) Categorical

PART III )
since 68% values are 1 std deviaiton from the mean

coresponding interval =14.79 -/+ 2.67 = ( 12.12 ,17.46 )

option 3 is correct