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

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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

Mathematics
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Other answers:

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?
D?
correct
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
note: the sample is just his history class, so it's not random
A?
read the answer choices again
d
keyword: "not random"
yes? I'll say it again... the sample is not a random sample...
ok :)
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.
you didn't get the answer to the other question correctly, go back...
ok what is it?
again... the sample is not random now read the answer choices and tell me what the answer is...
A
keep trying... pay attention to the words NOT RANDOM
c!
once again.... the sample is not a random sample....
pay attention to the word NOT(!!!!!) a random sample
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D
one last time... the sample of his history class is NOT a random sample... so our answer is...? which answer matches the most closely?
read every answer choice again CAREFULLY
i already said every choice and you said no for all of them
we're talking about the question for Stanley...
there's one answer you didn't say yet...
b
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
Right, B... do you understand why?
like I keep saying... the sample is not a random sample.... which matches answer B.... please focus...
ok :)
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.
anyway let's keep going...
once again, the sample is not random, so our answer is...?
A
correct
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.
how many of these are left? I need to go to sleep sooon...
about 7
adventure
right, so our answer is...?
b
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.
b
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
well, we know that there were 92 bass out of 200 fish so how many bass are there out of 1,000 fish?
how do i find that
1,000 is 5 times 200, right? so the number of bass is 5 times the number in the sample
ok so??
read what I said carefully...
C
no... read carefully...
how many bass were in the sample?
look at the table......
92
now multiply that by 5....
D!
right....
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
whichever one has more dots to the right...
it's tough to visualize this based on text alone...
team D?
yeah, team D, I just did a bit of math to confirm it
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.
would you mind drawing them out for me? I'm getting a little exhausted...
1 Attachment
well, look at which grph has more dots on the right side...
round 2
??
well, then again, I would say that the range is the same
so I guess the first answer works better
ok
1 Attachment
MAD of 6th graders/MAD of 7th graders = ?
1.2 / 1.0
which equals = ?
1.2
right, and that's our answer
1 Attachment
well first off, which group has the longer lengths?
b
right, so what do you think the answer is?
c
right
1 Attachment
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?
walk in
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
4
right, now look at the "walk in" graph and do the same thing
2
now take a look at the answer choices and tell me which one matches
c
right
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.
vague question but I would look at the mean absolute deviation (variability) of the grammar book, which is very high
so what is it?
please answer quickly
the inference isn't valid since there is a lot of variability...
so b?
no, read carefully...
i mean A sorry
right

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