Problem 3E

Bookstore sales Consider the following data from a small bookstore.

a) Prepare a scatterplot of Sales against Number of sales people working.

b) What can you say about the direction of the association?

c) What can you say about the form of the relationship?

d) What can you say about the strength of the relationship?

e) Does the scatterplot show any outliers?

Chapter 1: Sections 1-6 1.1 What is a Function A function is a rule that takes certain numbers as inputs and assigns to each a definite output number. Domain: the set of all input numbers Range: the set of all output numbers Independent Variable: input Dependent Variable: output Interval Notation: Closed Intervals: a ⦤ t ⦤b and is written [a,b] Open Intervals: a < t < b and is written (a,b) A mathematical model is a mathematical description of a real situation. Increasing and Decreasing Functions: A function is increasing if the values of f(x) increase as x increases A function is decreasing if the values of f(x) decrease as x increases 1.2 Linear Functions A linear function has a graph that has a straight line. Slope= ri