March 1, 2019 · Day 02 Measures of Central Tendency.notebook March 01, 2019 March 1, 2019 Aim:...

Day 02 Measures of Central Tendency.notebook March 01, 2019

March 1, 2019

Aim: SWBAT use the measures of central tendency to describe and interpret data.

Do Now: Read the notes at the top of Page 7 and try Example 1.

Homework: Pages 10 & 11 in the Unit 9 Packet

Unit 9 ~ Quiz (Statistical Analysis - 60 Points) is Friday, March 8th (Pages 1 - 32)


The survey is not biased because the people surveyed werechosen randomly from the data base. Each book buyer had an equal chance of being chosen.

The survey is biased because the people surveyed were part of a group -- they were all leaving a Jazz concert . . . meaning they all like Jazz music.

I disagree, his sample is biased. While, Max used a pattern (every third child) he was outside a sporting goods store so all the children were part of a group . . . they are more likely to play sports.

60 n

= 8 40

2400 = 8n88

300 = nI predict there are 300 fish

in the lake.


24 80

= n 1800

43,200 = 80n8080

540 = nI would predict that 540students have cell phones.

3 400

= n 100,000

n = 750

3 400

= n 150,000

450,000 = 400n400400

1125 = nI would predict that 1125coins will have misprints.

7 50

= n 400

2800 = 50n5050

56 = n

Since Zach found that 7 out of 50 students had traveled to a foreign country, we can set up a proportion to predict how many students out of 400 had traveled to a foreign country. When I solved the proportion learned that I could predict that 56 students traveled to a foreign country. This supports Zach's claim.


80 10

= 8 mean = 8

6, 7, 7, 7, 7, 8, 9, 9, 10, 10

median = 7.5 mode = 7


72 12

= 6 mean = 6

2, 3, 3, 3, 4, 4, 4, 4, 5, 6, 16, 18 median = 4

mode = 4

median or mode

Yes 16 & 18The outliers

affect the mean, but not the median. Since the median and mode are the same, we choose both.


264 11

= 24

5, 7, 8, 11, 12, 13, 15, 16, 17, 76, 84 median = 13

no mode

204 12

= 17

3, 6, 8, 9, 10, 10, 12, 14, 20, 27, 34, 51

median = 11

mode = 10

mean = 24 mean = 17

24 13 none

17 11 10

greater than

greater than

There is only 1 mode

greater


200 10

= 20

11, 18, 19, 20, 20, 21, 22, 23, 23, 23 median = 20.5

mode = 23

Usually when there is an outlier, we do not choose the

mean = 20

mean. However, since the mean and median are very

close in value, we cannot choose one without the other.


99 11

= 9 Class A

102 12

Class B = 8.5

Class A mean = 9

Class B mean = 8.5

8, 8, 8, 9, 9, 9, 9, 9, 10, 10, 10 median = 9Class AClass B 5, 6, 7, 8, 8, 9, 9, 10, 10, 10, 10, 10 median = 9

Class AClass B

mode = 9mode = 10

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