Chpt 2 presenting data in tables and charts

Question 1

what are ordered arrarys

Answer 1

a bunch of things in cells you want to sort from smallest to largest
- a range of cells

Question 2

what is helpful using ordered arrarys

Answer 2

easy to pick out extremes, typical values and the area where the majority of the values are concentrated

Question 3

what is a stem and leaf dispay

Answer 3

separates data entries into leading digits (or stems) and trailing digits (or leaves)

• first column is the stem and second column is the leaves
• ignores decimal portions of values

Question 4

what is stem and leaf display valuable for

Answer 4

for organizing a set of data and understanding how the values distribute and cluster over the range of the observations in the data set

Question 5

What is frequency distribution

Answer 5

shows the number of instances in which a variable takes each of its possible values

Question 6

what are the steps using frequency distribution

Answer 6

Step1: find the highest and lowest value

Step2: Find the range

Step 3: select the number of classes desired

Step4: find the width by dividing the range by the number of classes and rounding up

Step 5: select a starting point (usually the lower value or any convenient number less than the lowest value) add the width to get the lower limits

Step 6: find the upper class limit

Step 7: find the boundaries