Summer Review- Video 3

Question 1

What is a random sample

Answer 1

When you choose a sample by rolling dice, choosing names from a hat, or other real randomly generated samples. Humans can’t do this well without the help of a device or paper or cards or dice.

Question 2

What is frequency?

Answer 2

Frequency is how often something occurs/ comes up

Question 3

Data vs Datum

Answer 3

Datum (singular) ex. I collected datum from my sister

Data (plural) ex. I collected data from a few of my neighbors

Question 4

What is frequency distribution?

Answer 4

A table, or chary that shows how often something occurs

Question 5

What is relative frequency

Answer 5

How often something occurs compared to the total. In other words the percent of time something comes up. Frequency/total

Question 6

How to find relative frequency?

Answer 6

Divide by the total

Question 7

What is meant by cumulative frequency?

Answer 7

Sum the frequency as you go 
.           .
.           .   .
.    .      .   .   . 
_   _      _   _  _

3. 1. 3. 2. 1

3- occurs twice
2- occurs once
1- occurs twice

Ex. Two people got one
Three people got a two or lower
Five people got a three or lower

Question 8

What is relative cumulative frequency

Answer 8

Add up percentages as you go

Question 9

What is the difference between a chart and a histogram?

Answer 9

Chart: categorical data (columns do not touch)

Histogram: quantitative data (bars touch)