Question

The stem-and-leaf plot
shows the heights in centimeters of Teddy Bear sunflowers grown in two different types of soil.

*picture on bottom

a) Describe the overlap of the two sets of data.

b) Calculate the mean of each data set.

c) Calculate the mean absolute deviation (MAD) of each data set.

d) Which set is more variable? How do you know?

Answer 1

@jtryon

Answer 2

@jim_thompson5910

Answer 3

@mathslover

Answer 4

@ganeshie8

Answer 5

the middle column is the `first digit` of height

Answer 6

for Soil B, the heights are :
50
63, 69
70, 72, 73, 76, 77, 78
83

Answer 7

for Soil A, the heights are :
61, 61, 62, 65
70, 71, 75
81, 82
90

Answer 8

Are there any common heights between the data from two Soils ?

Answer 9

there is 70

Answer 10

Excellent ! you're done wid part (a)

Answer 11

ok whats for b?

Answer 12

@ganeshie8 whats for B?

Answer 13

you have observations, so find the mean

Answer 14

add all the observation ,
divide by the number of observations

Answer 15

how many observations are there in Soil A ?

Answer 16

its 3:00 am here now

Answer 17

can you put all numbers of soil A and B?

Answer 18

@ganeshie8

Answer 19

lets do this in the morning :)
i have already given u the observations for both soils above^

Answer 20

for Soil A, the heights are :
61, 61, 62, 65
70, 71, 75
81, 82
90

Answer 21

for Soil B, the heights are :
50
63, 69
70, 72, 73, 76, 77, 78
83

Answer 22

it looks there are 10 observations from each Soil.
so for each Soil, simply add all the 10 observations and divide by 10

Answer 23

that gives u the mean for each Soil ^

Answer 24

for C?

Answer 25

you need the value of `mean` for each Soil to calculate the `MAD`

Answer 26

So, first try to finish part B

Answer 27

i already tried b

Answer 28

oh good, what is the mean for each Soil ?

Answer 29

A's mean is 71.8

Answer 30

B's mean is 72

Answer 31

Excellent !

Answer 32

here is how to calculate `MAD` :
http://www.mathsisfun.com/data/mean-deviation.html

Answer 33

can you please put how to calculate mad is 3:00 am here

Answer 34

its bit lengthy, if u do the steps in that link you should get :

`MAD` for Soil A :
http://www.wolframalpha.com/input/?i=mean+absolute+deviation+61%2C+61%2C+62%2C+65%2C+70%2C+71%2C+75%2C+81%2C+82%2C+90

`MAD` for Soil B :
http://www.wolframalpha.com/input/?i=mean+absolute+deviation+50%2C63%2C+69%2C70%2C+72%2C+73%2C+76%2C+77%2C+78%2C83

Answer 35

for part D :
Since MAD of Soil B is less than MAD of SoilA,
Soil B observations are less variable.

Answer 36

so i have to multiply them all?

Answer 37

for which part ?

Answer 38

to find the MAD

Answer 39

look up that link, it has nice explanation

Answer 40

ok

Answer 41

here are the steps :
1) for each observation, find the distance to mean by subtracting each observation from mean
2) take the mean of all these distances

Answer 42

Im super duper duper tired right now

Answer 43

nut I have o finish this

Answer 44

we're already done, right ?

Answer 45

yeah

Answer 46

its 3:38 here in the orning

Answer 47

we're done wid this problem.
move to next problem :)

Answer 48

oh i have a new problem

Answer 49

ill say it later

Answer 50

okay

Answer 51

@ganeshie8 here

The table shows the rainfall in inches, In the month of July for the years of 2006 to 2011 Table: http://gyazo.com/2b723acafc1ccfe18e59b07260a34c71 Alex used the data to make a graph Graph: http://gyazo.com/641a1d2384986924536db58cfbbbf166