The performing arts teacher wants to know whether the students in the entire school prefer music or theater. The teacher draws a random sample from the following groups:
All school teachers
All students in the band
All boys in each grade
All students in each grade
Which of the following groups best represents the population she should take a random sample from to get the best results for her survey?
All school teachers
All students in the band
All boys in each grade
All students in each grade

- anonymous

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- anonymous

@Abhisar @Vocaloid

- anonymous

@Abhisar

- anonymous

@Vocaloid

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## More answers

- Vocaloid

well, we pick the sample that is most like the population
our population is: every student in the school, so which do you think is the answer?

- anonymous

D?

- Vocaloid

correct

- anonymous

Stanley wants to know how many students in his school enjoy watching talk shows on TV. He asks this question to all 24 students in his history class and finds that 55% of his classmates enjoy watching talk shows on TV. He claims that 55% of the school's student population would be expected to enjoy watching talk shows on TV. Is Stanley making a valid inference about his population?
No, it is not a valid inference because he asked all 24 students in his history class instead of taking a sample from his math class
No, it is not a valid inference because his classmates do not make up a random sample of the students in the school
Yes, it is a valid inference because his classmates make up a random sample of the students in the school
Yes, it is a valid inference because he asked all 24 students in his history class

- Vocaloid

note: the sample is just his history class, so it's not random

- anonymous

A?

- anonymous

@Vocaloid

- Vocaloid

read the answer choices again

- anonymous

d

- Vocaloid

keyword: "not random"

- anonymous

@Vocaloid

- Vocaloid

yes?
I'll say it again... the sample is not a random sample...

- anonymous

ok :)

- anonymous

A researcher posts a mobile advertisement offering $15 in exchange for participation in a short study. The researcher accepts the first 15 people who respond to the advertisement. Which of the following statements is true about the sample?
It is not a valid sample because it is not a random sample of the population.
It is a valid sample because the first 15 people were selected to participate.
It is a valid sample because money was offered to participants.
It is not a valid sample because it is only a short study.

- anonymous

@Vocaloid

- Vocaloid

you didn't get the answer to the other question correctly, go back...

- anonymous

ok what is it?

- Vocaloid

again...
the sample is not random
now read the answer choices and tell me what the answer is...

- anonymous

A

- Vocaloid

keep trying...
pay attention to the words NOT RANDOM

- anonymous

c!

- Vocaloid

once again.... the sample is not a random sample....

- Vocaloid

pay attention to the word NOT(!!!!!) a random sample

- Vocaloid

|dw:1440118923235:dw|

- anonymous

D

- Vocaloid

one last time...
the sample of his history class is NOT a random sample... so our answer is...? which answer matches the most closely?

- Vocaloid

read every answer choice again CAREFULLY

- anonymous

i already said every choice and you said no for all of them

- Vocaloid

we're talking about the question for Stanley...

- Vocaloid

there's one answer you didn't say yet...

- anonymous

b

- Vocaloid

- Vocaloid

Right, B... do you understand why?

- Vocaloid

like I keep saying... the sample is not a random sample.... which matches answer B.... please focus...

- anonymous

ok :)

- anonymous

- Vocaloid

anyway let's keep going...

- Vocaloid

once again, the sample is not random, so our answer is...?

- anonymous

A

- Vocaloid

correct

- anonymous

Below are the data collected from two random samples of 100 members of a large travel club regarding the type of vacation they prefer:
Sample Adventure Beach Cruise Ski
A 73 19 5 3
B 71 22 3 4
Which of the following inferences can be made based on the data?
Most members prefer a beach vacation.
Most members prefer an adventure vacation.
More members prefer a cruise vacation and a ski vacation than a beach vacation.
More members prefer a beach vacation and a cruise vacation than an adventure vacation.

- Vocaloid

how many of these are left? I need to go to sleep sooon...

- anonymous

about 7

- anonymous

adventure

- Vocaloid

right, so our answer is...?

- anonymous

b

- anonymous

Ethel surveyed a random sample of 100 students from her middle school to learn more about what type of school lunches are preferred. The table shows the result of the survey.
Hamburgers Tacos Pizza
Sample #1 13 43 44
Sample #2 20 41 38
Which of the following inferences can be made based on the data?
Pizza is the most preferred lunch.
Tacos and pizza are almost equally preferred.
Hamburgers are two times more popular than tacos.
Hamburgers are two times more popular than pizza.

- anonymous

@Vocaloid

- anonymous

b

- anonymous

The table shows the data of a random sample of fish that were collected from and later released into a lake.
Type of Fish Bass Eel Gar
Number of Fish 92 56 52
How many bass are estimated to be present if a sample of 1,000 fish is collected from the lake?
184
292
420
460

- Vocaloid

well, we know that there were 92 bass out of 200 fish
so how many bass are there out of 1,000 fish?

- anonymous

how do i find that

- Vocaloid

1,000 is 5 times 200, right? so the number of bass is 5 times the number in the sample

- anonymous

ok so??

- Vocaloid

read what I said carefully...

- anonymous

C

- Vocaloid

no... read carefully...

- Vocaloid

how many bass were in the sample?

- Vocaloid

look at the table......

- anonymous

92

- Vocaloid

now multiply that by 5....

- anonymous

D!

- Vocaloid

right....

- anonymous

The dot plots below show the weights of the players of two teams:
Two dot plots are shown one below the other. The top and the bottom plots have the title Team C and Team D respectively. Below the line for each dot plot is written Weight followed by pounds in parentheses. The markings on each line are from 120 till 140 at intervals of 1. For the top plot there are two dots each for 120, 121 and 126 and 1 dot each for 123, and 128. For the bottom plot there are 2 dots each for 130 and 139 and 1 dot each for 126, 127, 132, and 135.
Based on visual inspection of the dot plots, which team appears to have the larger mean weight?
Not enough information is available to draw a conclusion.
Both groups are similar.
Team D
Team C

- Vocaloid

whichever one has more dots to the right...

- Vocaloid

it's tough to visualize this based on text alone...

- anonymous

team D?

- Vocaloid

yeah, team D, I just did a bit of math to confirm it

- anonymous

ok ! next
The dot plots below show the scores for a group of students for two rounds of a quiz:
Two dot plots are shown one below the other. The title for the dot plot on the top is Round 1 and the title for the bottom plot is Round 2. Below the line for each dot plot is written Score. There are markings from 1 to 5 on the line at intervals of one. There are 2 dots above the mark 2, there are 3 dots above the mark 3, there are 2 dots above the mark 4 and there is 1 dot above the mark 5. For the bottom dot plot there is 1 dot above the mark 2, there are 2 dots above the mark 3, there are 3 dots above the mark 4 and there are 2 dots above the mark 5.
Which of the following inferences can be made using the dot plots?
The range of each round is the same.
There is no overlap between the data.
Round 1 scores were higher than round 2 scores.
Round 2 scores were lower than round 1 scores.

- Vocaloid

would you mind drawing them out for me? I'm getting a little exhausted...

- anonymous

##### 1 Attachment

- Vocaloid

well, look at which grph has more dots on the right side...

- anonymous

round 2

- anonymous

??

- Vocaloid

well, then again, I would say that the range is the same

- Vocaloid

so I guess the first answer works better

- anonymous

ok

- anonymous

##### 1 Attachment

- Vocaloid

MAD of 6th graders/MAD of 7th graders = ?

- anonymous

1.2 / 1.0

- Vocaloid

which equals = ?

- anonymous

1.2

- Vocaloid

right, and that's our answer

- anonymous

##### 1 Attachment

- Vocaloid

well first off, which group has the longer lengths?

- anonymous

b

- Vocaloid

right, so what do you think the answer is?

- anonymous

c

- Vocaloid

right

- anonymous

##### 1 Attachment

- Vocaloid

huh, this is actually kinda a bad question but I'll try anyway
I'm guessing that by "average" they're looking at mode, which is the number that occurs most often
so take a look at the first graph, for "online" customers, which number has the most dots?

- anonymous

walk in

- Vocaloid

no, no, that's not what I meant...
just look at the "online" graph and tell me which number has the most dots above it

- anonymous

4

- Vocaloid

right, now look at the "walk in" graph and do the same thing

- anonymous

2

- Vocaloid

now take a look at the answer choices and tell me which one matches

- anonymous

c

- Vocaloid

right

- anonymous

Macy wants to know if the number of words on a page in her grammar book is generally more than the number of words on a page in her math book. She takes a random sample of 25 pages in each book, then calculates the mean, median, and mean absolute deviation for the 25 samples of each book.
Mean Median Mean Absolute Deviation
Grammar 49.7 41 8.4
Math 34.5 44 1.9
She claims that because the mean number of words on each page in the grammar book is greater than the mean number of words on each page in the math book, the grammar book has more words per page. Based on the data, is this a valid inference?
No, because there is a lot of variability in the grammar book data.
Yes, because there is a lot of variability in the grammar book data.
Yes, because the mean is larger in the grammar book.
No, because the mean is larger in the grammar book.

- Vocaloid

vague question but I would look at the mean absolute deviation (variability) of the grammar book, which is very high

- anonymous

so what is it?

- anonymous

@Vocaloid

- anonymous

please answer quickly

- Vocaloid

the inference isn't valid since there is a lot of variability...

- anonymous

so b?

- Vocaloid

no, read carefully...

- anonymous

i mean A sorry

- Vocaloid

right

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