Question

The following dot plots represent the scores on the Chapter 5 quiz for Mrs. Chin's 4th and 6th period classes.

Calculate the mean and mean absolute deviation (rounded to the nearest tenth) for both classes.
Use your answer calculations from part A to answer all of the following questions: Which class period, on average, scored better on the quiz? By how much did they score better? How does the difference between the mean scores compare to the mean absolute deviation? Is there much overlap in the data? Write your answers in complete sentences.

Answer 1

do you know witch number is the mean

Answer 2

no, I suck at math. I'm pretty bad when it comes to things like this

Answer 3

any chance someone could help me alittle?

Answer 4

the mean is the average of the numbers

Answer 5

add up all the number then divide

Answer 6

many number there are

Answer 7

so to start,4th period.

Answer 8

divided by the amount of points?

Answer 9

1st your gonna put the point in order from least to greatest

Answer 10

once you do that check and see if theres an even number in the data set ..

Answer 11

what do you mean by put the point in order from least to greatest. and what graph the 4th period or 6th or what one are we working on right now

Sorry if i'm asking alot of questions I'm really bad at math

Answer 12

chapter 5 math quiz 4th period ,of course .

Answer 13

ok so I just list out the numbers in least to greatest?

Answer 14

Yes , and after you do that you check for any even numbers.

Answer 15

like this? 10, 12, 12, 12, 13, 13, 13, 13, 14, 14, 15, 15, 15, 15, 15, 15, 16, 16

Answer 16

where did those numbers come from ?

Answer 17

the picture above..

Answer 18

the plot that I attached

Answer 19

Yeah you're missing one number

Answer 20

what number? I'm actually so confused, sorry

Answer 21

18

Answer 22

You missed 19

Answer 23

wait I'm confused I thought I was just supposed to do that for the top part (4th period, I thought I was only getting numbers for the first. )

Answer 24

oh right ugh one second.

Answer 25

Yeah this is the top part

Answer 26

10, 12, 12, 12, 13, 13, 13, 13, 14, 14, 15, 15, 15, 15, 15, 15, 16, 16, 19

Answer 27

yeah my bad i meant 19 & that is the top part

Answer 28

Good now add them up

Answer 29

267?

Answer 30

wait 1st are there any even numbers ?

Answer 31

wdym?

Answer 32

What i mean is are there any even numbers ? do you know what even numbers are ?

Answer 33

I know what even numbers are just confused. like 10, 12 or like the number of dots? I'm just not all that good at all of this sorry I feel incredibly dumb

Answer 34

ooopps my bad i was doing median xd

Answer 35

Actually count the number of dots there are

Answer 36

19

Answer 37

Ye

Add them and then divide the answer by 19

Answer 38

@dude thank you thats what i was tryna say

Answer 39

14

Answer 40

or 14.05 and so on

Answer 41

once you add it it should come up to 267 , then u divide 267 by 19

Answer 42

and yes your correct u should get 14.05

Answer 43

ok

Answer 44

that's the mean?

Answer 45

14.05

Answer 46

rounded to the nearest tenth or is that just for the MAD

Answer 47

not sure @dude

Answer 48

I'm guessing it means round both

Answer 49

Yeah

Answer 50

ok so then it's 14.1 is the mean?

Answer 51

and if that is true then I also figured out the mean of the other aswell. now for the MAD

Answer 52

now I don't remember nearly at all what the MAD is or how to find it

Answer 53

Not sure if they taught you with a certain notation

MAD = \(\large \frac{\sum |xi-\overline{x}|}{n}\)

Answer 54

Do you know what each variable represents?

Answer 55

Or does this seem new to you?

Answer 56

completely new.

Answer 57

xi is a number in the set

x with the line is the mean

n is the total number of numbers {number of data}

Answer 58

The funny shaped E is just sum

Answer 59

huh...

Answer 60

this is for figuring out the MAD?

Answer 61

Yeah

Do you have notes? (It would help since I was not taught the same way as you were)

Answer 62

no I don't.

Answer 63

I was going back through the lessons but I have no idea.

Answer 64

10, 12, 12, 12, 13, 13, 13, 13, 14, 14, 15, 15, 15, 15, 15, 15, 16, 16, 19

Subtract each point from the mean

So...
10-14.1
12-14.1
12-14.1

and so on

Answer 65

ok

Answer 66

The || means to keep the number as a positive number

So
|1-5| = 4, not -4

Answer 67

do I have to repeat for the amount of points? so for say 12 how there is 2 points repeat it twice? this is going to get long....

Answer 68

Yes repeat for every point, even if it is the same point

Answer 69

10 - 14.1 = -4.1
12 - 14.1 = -2.1
12 - 14.1 = -2.1
12 - 14.1 = -2.1
13 - 14.1 = -1.1
13 - 14.1 = -1.1
13 - 14.1 = -1.1
13 - 14.1 = -1.1
14 - 14.1 = -0.1
14 - 14.1 = -0.1
15 - 14.1 = 0.9
15 - 14.1 = 0.9
15 - 14.1 = 0.9
15 - 14.1 = 0.9
15 - 14.1 = 0.9
15 - 14.1 = 0.9
16 - 14.1 = 1.9
16 - 14.1 = 1.9
19 - 14.1 = 4.9

hope I did this right...

Answer 70

Make all the negatives positives but yes

Answer 71

oh so instead of like -4.1 I do just 4.1

Answer 72

10 - 14.1 = +4.1
12 - 14.1 = +2.1
12 - 14.1 = +2.1
12 - 14.1 = +2.1
13 - 14.1 = +1.1
13 - 14.1 = +1.1
13 - 14.1 = +1.1
13 - 14.1 = +1.1
14 - 14.1 = +0.1
14 - 14.1 = +0.1
15 - 14.1 = 0.9
15 - 14.1 = 0.9
15 - 14.1 = 0.9
15 - 14.1 = 0.9
15 - 14.1 = 0.9
15 - 14.1 = 0.9
16 - 14.1 = 1.9
16 - 14.1 = 1.9
19 - 14.1 = 4.9

Answer 73

Ye

Answer 74

oh ok

Answer 75

so now?

Answer 76

Now all all the answers you got

Answer 77

add

Answer 78

ok

Answer 79

I think 29.1

Answer 80

I hope...

Answer 81

Yep and now divide by the number of dots

Answer 82

which was 19 right?

Answer 83

Ya

Answer 84

1. 53 and so on

Answer 85

Round to the nearest tenth

Answer 86

1.5

Answer 87

I just realized I have to do this all over again for the other period... omg

Answer 88

Yeah

Answer 89

But you get the idea now, right?

Answer 90

yes. for the most part. and then just the questions at the end.

Answer 91

is all that's left once I figure out the other MAD

Answer 92

Find the mean and MAD for the second set okay?

First set: Mean = 14.1
MAD = 1.5

Answer 93

ok

Answer 94

and for the other now.

Answer 95

13
14
15
15
15
16
16
17
17
17
17
18
18
18
18
18
19
20

so then I do what again?

Answer 96

Add them up and divide by the number of dots in that set

Answer 97

6.7 is what I have for the mean fo the 2nd part

Answer 98

i mean no 16.7

Answer 99

and it's the mean that subtract everything from right?

Answer 100

13 - 16.7 = +3.7
14 - 16.7 = +2.7
15 - 16.7 = +1.7
15 - 16.7 = +1.7
15 - 16.7 = +1.7
16 - 16.7 = +0.7
16 - 16.7 = +0.7
17 - 16.7 = 0.3
17 - 16.7 = 0.3
17 - 16.7 = 0.3
17 - 16.7 = 0.3
18 - 16.7 = 1.3
18 - 16.7 = 1.3
18 - 16.7 = 1.3
18 - 16.7 = 1.3
18 - 16.7 = 1.3
19 - 16.7 = 2.3
20 - 16.7 = 3.3

hope this is right too.

Answer 101

and then added up is 26.2

Answer 102

and then I divide by the amount of dots, which is 18 in this case right?

Answer 103

Good

Answer 104

which then goes to 1.45 which rounded to the nearest tenth makes it 1.5

Answer 105

so 1.5 is the MAD for this one too?

Answer 106

Yep

Answer 107

ok so now on to the questions at the end?

Answer 108

Which class period, on average, scored better on the quiz?
By how much did they score better?
How does the difference between the mean scores compare to the mean absolute deviation?
Is there much overlap in the data?

these are them...

Answer 109

so for the first question. the 6th period is better right?

Answer 110

is it decided by the mean

Answer 111

Average is another word for mean

(Which mean was greater?)
(By how much?)
(How are the means different to their MAD’s?)

Answer 112

What I have so far.

4th period: 14.1 is the mean, the MAD is: 1.5
6th period: 16.7 is the mean, the MAD is: 1.5

Which class period, on average, scored better on the quiz?
Answer: 6th period got better scores.

By how much did they score better?
Answer: 2.6

Then the rest is to be done.

Answer 113

what u need help with ?

Answer 114

just figuring out these last 2.

Answer 115

witch 2 ?

Answer 116

the 2 above I said I haven't done yet.

Answer 117

4th period: 14.1 is the mean, the MAD is: 1.5
6th period: 16.7 is the mean, the MAD is: 1.5

Which class period, on average, scored better on the quiz?
Answer: 6th period got better scores.

By how much did they score better?
Answer: 2.6

Then the rest is to be done.

Answer 118

this

Answer 119

that is what I have done. yes the rest is what I have

Answer 120

im on my own math rn

Answer 121

ok so to start this one.

How does the difference between the mean scores compare to the mean absolute deviation?

this is something I'm confused about and don't know how or what the answer is.

Answer 122

What I have so far.

4th period: 14.1 is the mean, the MAD is: 1.5
6th period: 16.7 is the mean, the MAD is: 1.5

Which class period, on average, scored better on the quiz?
Answer: 6th period got better scores.

By how much did they score better?
Answer: 2.6

the last question which is one above is tied into everything btw

Answer 123

if anyone knows anything about the last question above the what I have so far please let me know