Unit 4 T

Question 1

The mean value is The…… Value of a set of data, while the median is the…… I have a set of data

X. Average

Y. Mathematical center between the top of value and bottom value in the range of a full set of data

Z. Value of the data point in the middle of a set of data points, ordered by ascending value for the average value of the two middle points

Answer 1

X, Z

Question 2

A flat line on a cumulative recording indicates

A zero rate for the dependent variable for as long as the line remains flat

An unchanging rate at that level of the dependent variable

A decreasing rate overtime

Answer 2

A zero rate for the dependent variable for as long as the line remains flat

Question 3

Any bar graph, the horizontal axis typically represents:

Answer 3

Classification variables of some type

Question 4

Which of the following characteristics of a graphical display contributes most to A visual analysis of the data?

A the trend

B the X axis range

C The range of the full set of data

D. All of these contribute equally to a visual analysis

Answer 4

The Trend

The X axis range is important, but only tells you how many observation. I.e., time units during which data were collected, were graphed. The range only tells you the difference between the highest value data points and the lowest value data point. But the trend it tells you and which direction the data is heading – meaning you can see whether the behavior is increasing, decreasing, or staying roughly the same