Question

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

Soil A Soil B
5 | 9
5 2 1 1| 6 | 39
510 | 7 | 023678
21| 8 | 3
0| 9
Key: 9|6 means 69,Key: 5|8 means 58

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?

i just need steps A and D

Answer 1

@amistre64

Answer 2

i dont know what A would me

D is finding the variance of each set .... which is a common formulation

Answer 3

sum(x-mean)^2 / N

Answer 4

idk how to do that... can you explain it?

Answer 5

@amistre64 what is common formulation?? i dont think that is how it is cuz i haven't learned that yet... i think it mean the set that has more numbers or variety.

Answer 6

its the average squared differences from the mean

what is our mean?

Answer 7

well the mean of soil A is 71.8 and soil B is 72

Answer 8

if you havent learned to compute variances yet by formula, then an approximation might be better suited.

rule of them is standard deviation = range/4 ...

Answer 9

*** rule of thumb

Answer 10

i haven't learned that either... lol rule of thumb XD

Answer 11

ok, then visually looking at it

which one is more concentrated in a particular spot?

Answer 12

A B
0 5 | 9 1
4 5 2 1 1| 6 | 39 2
3 510 | 7 | 023678 6
2 21| 8 | 3 1
1 0| 9 0

Answer 13

Soil A: 61 61 62 65 70 71 75 81 82 90
Soil B: 59 63 69 70 72 73 76 77 78 83

Answer 14

notice how most of B is concentrated in the 70s range

A is more evenly dustributed

which has more variety?

Answer 15

Soil A sorry

Answer 16

no, if everything is a blue cat, then ...

yeah A :)

Answer 17

:D what about the overlap thing?

Answer 18

i got no idea about that one, me and wordiness just dont jive

Answer 19

come up with some fanciful description, the overlap is what they have the most in common right?

Answer 20

aww well overlap maybe the one that the sets have right on top of each other but they dont have one... :/

Answer 21

the stem and leaf shows the overlap

Answer 22

this is a stem and leaf plot

Answer 23

a bidirectional one yes

5 | 9
>> 5 2 1 1| 6 | 39
>> 510 | 7 | 023678
>> 21| 8 | 3
0| 9

Answer 24

forgot to space the top one over

Answer 25

so there is and overlap?

Answer 26

Soil A: 61 61 62 65 70 71 75 81 82 90
Soil B: 59 63 69 70 72 73 76 77 78 83

i tried it thi way but there is no overlap here... ;/

Answer 27

youre trying the wrong way ...

or at least you cant see the forest thru the trees ...

Answer 28

Soil A: 61 61 62 65 70 71 75 81 82 90
Soil B: 59 63 69 70 72 73 76 77 78 83
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
range of commonality

Answer 29

i might even consider 61 and 62 in that range ...

Answer 30

so what is the overlap?

Answer 31

5 | 9
>> 5 2 1 1| 6 | 39
>> 510 | 7 | 023678
>> 21| 8 | 3
0| 9

these rows overlap

Answer 32

its the parts of the stem and leaf that have 2 sides ....

Answer 33

so row 2 3 and 4 overlap. how?

Answer 34

ill im going to be able to do is repeat myself so im not going to bother with that ...

Answer 35

oh ok