Question

can someone please help me???????

Answer 1

in statistics..... how do I find center, shape, and spread of a stemplot?

Answer 2

@AkashdeepDeb

Answer 3

@DebbieG can you please help me?

Answer 4

@AravindG @chmvijay

Answer 5

@sirryan1 ?

Answer 6

try @Hero or @Preetha

Answer 7

thank you

Answer 8

@bobby4234534523

Answer 9

in statistics..... how do I find center, shape, and spread of a stemplot?

Answer 10

Do you have a stem plot? If so, can you please post it? Thanks

Answer 11

it doesn't show a picture but the numbers are 5, 7, 8, 9, 15, 16, 17, 19, 21, 22, 24, 33, 35, 37, 42, 46, 49, 51, and 57

Answer 12

ok one sec

Answer 13

given this data set, how would you write all this into a stem and leaf plot?

Answer 14

idk

Answer 15

well you'd start off by writing the tens digit of each number in a column like this

0 |
1 |
2 |
3 |
4 |
5 |

then for each tens digit you record the units digit off to the right

for instance, the numbers 42, 46, 49 would go in the row that starts with 4 like this

0 |
1 |
2 |
3 |
4 | 269
5 |

make sense?

Answer 16

yes but how would i find shape, center, and spread?

Answer 17

well go ahead and complete the stem and leaf plot for me and that will give you an idea about its shape

Answer 18

how i don't understand what they mean by shape?

Answer 19

the shape is basically a visual look at how the data is spread out

if all the data is very spread out, then the shape is more flat as compared to when the data is all clumped together

also if the shape is symmetrical, then this means that roughly half of the data is below the center and the other half is above the center

Answer 20

let me know what you get when you complete the stem and leaf plot

Answer 21

i just did so im thinking it would be symmetric...am i right?

Answer 22

can you post what you got

Answer 23

0 l 5 7 8 9
1 l 5 6 7 9
2 l 1 2 4
3 l 3 5 7
4 l 2 6 9
5 l 1 7

Answer 24

good, I'm getting the same

Answer 25

so this means that shape is roughly flat and somewhat symmetrical

although I would argue that it's slightly skewed to the right since most of the data is below the center

Answer 26

so it would be mainly skewed?

Answer 27

I would say it's slightly skewed to the right (not a significant skew really), but it's definitely not completely symmetric

Answer 28

ok so now how do i find the center? is it just the middle number?

Answer 29

there are 19 values

so the median, which is the center, is in slot number 19/2 = 9.5 which rounds up to 10

so the median is in slot 10

since the number 22 is in slot 10, this means that 22 is the median or center

Answer 30

0 | 5789
1 | 5679
2 | 124 <---- center is here
3 | 357
4 | 269
5 | 17

so you can see that the center is slightly pulled to the left (due to the skew)

Answer 31

oh ok thanks ..what about the spread now?

Answer 32

the spread is equal to the standard deviation

Answer 33

it's best to calculate this with a calculator since doing so by hand is a pain

Answer 34

do you know how to calculate the standard deviation with a calculator?

Answer 35

no can you explain it to me?

Answer 36

what kind of calculator do you have?

Answer 37

ti-30

Answer 38

ok I don't think that calculator can do standard deviation, I'll find an online one that can

Answer 39

what is standard deviation?

Answer 40

standard deviation basically tells you how spread out the data is in terms of a number so you can compare different data sets and see which ones are more spread out than others

in general, the higher the standard deviation is, the more spread out the data is and the more the data values are further away from the center

Answer 41

oh ok

Answer 42

ok here is a standard deviation calculator

http://easycalculation.com/statistics/standard-deviation.php

Answer 43

you just type the numbers into the box and hit the "calculate" button

Answer 44

so the spread is the standared deviation?

Answer 45

correct

Answer 46

what number did you get

Answer 47

16.35373

Answer 48

I'm getting the same

Answer 49

so that's the spread, if that number was larger, then the values would be more spread out and further away from the center

if it was smaller, then the values would be much closer to the center and the shape wouldn't be as flat

Answer 50

ok thank you sooo much

Answer 51

you're welcome