Question

help please!

Answer 1

@Vocaloid

Answer 2

which group do you think has the higher mean??

Answer 3

B so D?

Answer 4

uh, not quite, see how group B has more dots on the left side?

Answer 5

yes

Answer 6

that means that group B is going to have a smaller mean, so our answer is..?

Answer 7

C?

Answer 8

right

Answer 9

The following table shows the data collected from a random sample of 100 middle school students on the number of hours they do household chores every week:

Weekly Duration of Household Chores

Time (in hours) 0–1 2–3 4–5 6–7
Number of Students 32 64 3 1


There are 1,500 students in the school. Based on the sample proportion, how many students in the school would be expected to do household chores for at least two hours every week?
480
960
1,020
1,440

Answer 10

take a look at the table, how many students do at least 2 hours of chores per week?

Answer 11

64

Answer 12

not quite, think carefully...

"at least 2" means anything more than 2

Answer 13

right and it says 2-3 hours is 64

Answer 14

there's more than that, though... look at the table again carefully...

Answer 15

4-5 amd 6-7

Answer 16

right, so we add them all up, giving us...?

Answer 17

21

Answer 18

that's not what I meant, I meant to add the number of students...

Answer 19

68

Answer 20

there we go!

now, we have (68 students/100) for our sample, let's multiply this by 1500 students to get our answer

(68/100)*(1500) = ?

Answer 21

1020

Answer 22

right

Answer 23

The following table shows the data collected from four random samples of 50 students from a small middle school regarding the type of television shows they prefer to watch:

Television Show Preferences

Sample # News Music Movies Cartoons Total
1 2 12 6 30 50
2 3 10 5 32 50
3 5 13 7 25 50
4 6 19 8 17 50


Based on the results in the table, which type of television show is preferred by the majority of students in the samples?
News
Music
Movies
Cartoons

Answer 24

what do you think the answer is?

Answer 25

D?

Answer 26

right

Answer 27

The price of some jewelry sets in a store are shown below:


Store Price
A $110,000
B $100,000
C $1,110,000
D $130,000
E $120,000


Based on the data, should the mean or the median be used to make an inference about the price of the jewelry sets in the store?
Mean, because it is in the center of the data
Median, because it is in the center of the data
Median, because there is an outlier that affects the mean
Mean, because there are no outliers that affect the mean

Answer 28

hint: is there an outlier?

Answer 29

B?

Answer 30

pay attention to my hint:

is there an outlier?

Answer 31

no

Answer 32

are you sure?

there is one data point that is much larger than the others

Answer 33

oh wait.. there is an outlier

Answer 34

right, so our answer is...?

Answer 35

C?

Answer 36

good

Answer 37

Four students did a survey to find the ice cream flavor sixth-grade students prefer. The table below shows the method each student used to conduct the survey:


Student Method
Jane Asked 100 sixth-grade students at random what their favorite ice cream flavor is
Ken Asked 100 students at random from his seventh-grade class what their favorite ice cream flavor is
Sasha Asked 100 eighth-grade students at random what their favorite ice cream flavor is
Kevin Asked 100 third-grade students at random what their favorite ice cream flavor is


Which student's survey is most likely not biased?
Jane
Ken
Sasha
Kevin

Answer 38

hint: the goal is to find data for 6th graders, so our answer is...?

Answer 39

A?

Answer 40

yup

Answer 41

Sue wants to know how many families in her small neighborhood of 50 homes would volunteer to help at a neighborhood animal shelter. She put all the addresses in a bag and drew a random sample of 25 addresses. She then asked those families if they would volunteer to help at the shelter. She found that 18% of the families would volunteer to help at the shelter. She claims that 18% of the neighborhood families would be expected to help at the animal shelter. Is this a valid inference?

Yes, this is a valid inference because the 25 families speak for the whole neighborhood
Yes, this is a valid inference because she took a random sample of the neighborhood
No, this is not a valid inference because she only asked 25 families
No, this is not a valid inference because she did not take a random sample of the neighborhood

Answer 42

this is a random sample, so...?

Answer 43

b?

Answer 44

yes

Answer 45

whichever one has the greater MAD has the greater variability

Answer 46

A?

Answer 47

read the problem carefully...

Answer 48

b?

Answer 49

good

Answer 50

I really need sleep, how many more are there?

Answer 51

5 quick ones :) and thats it .. i promise

Answer 52

sure

Answer 53

The following table shows the data collected from 2 random samples of 100 students each from an after-school club regarding their favorite outdoor activity:


Sample Canoeing Bike Racing Reading Total
1 40 35 25 100
2 45 40 15 100


Which of the following observations can be made about the number of students in the club who prefer canoeing?
It is more than the number of students who prefer bike racing and reading combined.
It is less than the number of students who prefer bike racing and reading combined.
It is equal to the number of students who prefer reading.
It is less than the number of students who prefer bike racing.

Answer 54

what do you think the answer is? just go through each choice and see which one is true

Answer 55

d?

Answer 56

are you sure? is the number for canoing less than the number for bike racing?

Answer 57

no

Answer 58

so d is not the answer, keep trying

Answer 59

b

Answer 60

right

Answer 61

Noah wants to predict who will be selected as the sixth-grade treasurer for student council. Which of the following groups should Noah survey to make his prediction?

The first 100 students from an alphabetical list of the entire school
The first 100 students from an alphabetical list of sixth graders
One hundred random students from the entire school
One hundred random students from the sixth grade

Answer 62

well, like always, we want a random sample, and we want 6th graders, so our answer is...?

Answer 63

D?

Answer 64

yes

Answer 65

what do you think? which one has the higher mean?

Answer 66

b?

Answer 67

no, look at the graphs carefully... which one has more dots on the right side?

Answer 68

grade 6 so A?

Answer 69

yes

Answer 70

like we've said before...


higher mean absolute deviation means higher variability...

Answer 71

b or d right?

Answer 72

choose one...

Answer 73

d

Answer 74

right

Answer 75

last one!

Answer 76

well, which one has the greater mean?

Answer 77

A?

Answer 78

yes, so our answer is A

Answer 79

ok thank you for everything :)

Answer 80

no problem, don't forget to medal. good night ~

Answer 81

goodnight! oh! can you answer these quick questions please ... really fast.. they are not problems they are just questions ..please :)

Answer 82

What are scale drawing? Give an example.

Answer 83

@Vocaloid

Answer 84

@Vocaloid ??

Answer 85

are you there?