2.1 Introduction to Descriptive Statistics and Frequency Tables

Question 1

Types of descriptive statistics?

Answer 1

Numerical and Graphical

Question 2

data distribution

Answer 2

tells use what values it takes and how often it take these values, can be visualized and summarized numerically

Question 3

Visualizing data goals

Answer 3

using a picture to display the data to help see patterns

Question 4

Numerically summarizing data

Answer 4

summarize data with just a few measures, any observations that stick out, pick most appropriate descriptors of typical value or varation

Question 5

What type of visualization tools do we use for categorical data?

Answer 5

pie and bar charts

Question 6

What type of visualization tools do we use for quantitative data

Answer 6

stem-and-leaf plot, dot plot, histograms, boxplots, time series plot

Question 7

Frequency distribution table

Answer 7

shows how data is partitioned, or falls, among several classes by listing the categories along with the number of observations in each of them

Question 8

Frequency =

Answer 8

count

Question 9

relative frequency =

Answer 9

percentage or population

Question 10

cumulative

Answer 10

add as you go

Question 11

Bin width

Answer 11

difference between consecutive lower class limits

Question 12

Bins should

Answer 12

not overlap, hot have any gaps between them, have the same width and cover the range of the data

Question 13

How many bins should be used?

Answer 13

the square root of your number of observations