Unit 1

Data Classification

100

What are the keywords that describe 

Qualitative Data: 

Quantitative Data:

Qualitative Data: Labels or Non-numerical Entries 

Quantitative Data: Numerical Measurements or Counts

200

Discrete variables are whole numbers, so what are examples of continuous variables?

(decimals) GPA, Height, Weight etc.

300

What is the science of collecting, analyzing and interpreting data in order to make a decision?

Statistics

400

The height of all the students in a math class is a Population or a Sample?

Sample 

500

List all of the "Level Of Measurements" and give one example.

Nominal(ABC), Ordinal(Military Rank)  , Interval(Temperature), Ratio( Income)

Sampling Techniques

100

Randomly selecting people walking out of humanities to interview is an example of what technique?

Random Sampling

200

Name the technique: 

(The Easiest Method) where every 6th person is chosen to be tested in an experiment 

Systematic Sampling 

300

Name the technique: 

Kayla is asking everyone around her there age to get average data for her project. 

Convenience sampling  

400

Name the technique:

Members of a population are divided into strata and then a sample is taken for that.  

Stratified sampling 

500

Name the technique:

A population is divided into groups then a full region is selected to sample.

Cluster Sampling 

Frequency

100

Range = 

Max- Min

200

How do you find the class width? 

Range / # of classes

300

There are 44 data entries

Max= 200

Min= 112

Find the class width....

2

400

The midpoint of a class equals? 

Lower Limit= 158 

Upper Limit= 192

Lowest class limit + Upper class limit / 2

175

500

Relative Frequency is equal to? 

F/N or Class Frequency/Sample size 

Cumulative Frequency

100

What is Cumulative frequency? 

The Sublimation of all the frequency and is equal to the sample size 

200

When bars don't touch you must create what? 

What do you add and subtract from them?

 *Hint - Begins with class*

Class Boundaries & .5

300

What does the mean equal?

Sum of all the data/ # of data

400

Find the variance: 4 5 3 4 8

Mean = 4 + 5 + 3 + 4 + 85 = 245 = 4.8 

(4 − 4.8)^2 ......Ect then you have the sum..

FINAL ANSWER 14.85/5 = 2.96

500

Find the standard deviation:

You grow 20 crystals from a solution and measure the length of each crystal in millimeters. Here is your data:

9, 2, 5, 4, 12, 7, 8, 11, 9, 3, 7, 4, 12, 5, 4, 10, 9, 6, 9, 4

3.061

#1.Mean (9+2+5+4+12+7+8+11+9+3+7+4+12+5+4+10+9+6+9+4) / 20 = 140/20 = 7 

#2 Subtract the mean from each data point 

(9 - 7)2 = (2)2 = 4
(2 - 7)2 = (-5)2 = 25
(5 - 7)2 = (-2)2 = 4
(4 - 7)2 = (-3)2 = 9
(12 - 7)2 = (5)2 = 25
(7 - 7)2 = (0)2 = 0
(8 - 7)2 = (1)2 = 1
(11 - 7)2 = (4)22 = 16
(9 - 7)2 = (2)2 = 4
(3 - 7)2 = (-4)22 = 16
(7 - 7)2 = (0)2 = 0
(4 - 7)2 = (-3)2 = 9
(12 - 7)2 = (5)2 = 25
(5 - 7)2 = (-2)2 = 4
(4 - 7)2 = (-3)2 = 9
(10 - 7)2 = (3)2 = 9
(9 - 7)2 = (2)2 = 4
(6 - 7)2 = (-1)2 = 1
(9 - 7)2 = (2)2 = 4
(4 - 7)2 = (-3)22 = 9 

#3 Calculate the mean of the squared differences.(4+25+4+9+25+0+1+16+4+16+0+9+25+4+9+9+4+1+4+9) / 19 = 178/19 = 9.368 

#4 Then fidn the square root