Question

To assess the opinion of students at the Ohio State University about campus safety, a reporter for the student newspaper interviews 15 students she meets walking on the campus late at night who are willing to give their opinion.

Answer 1

The sample obtained is
A. a simple random sample of students feeling safe.
B. a convenience sample of students feeling safe.
C. a random sample of students with night classes.
D. probably biased because students walking on campus late at night probably tend to feel safer about doing so than does the student body at large.

Answer 2

I feel like A but that's exactly what the last question is.... I don't think D because it has to do with students who have night classes, which means they could feel unsafe... It could be C if they wanted to find a biased sample of students at night....

Answer 3

@CliffSedge

Answer 4

think about it: if you find a person late at night and they're willing to give their opinion and talk to you, are they comfortable or uncomfortable walking around late at night?

Answer 5

Hmm now that I think about it yeah that makes sense... The rest were most likely scared, or didn't care... So it is D?

Answer 6

This is definitely biased.

Answer 7

It is a convenience sample (non-random as the reporter chose who to ask), but it is plenty biased as well.

Answer 8

yes it's biased because the people willing to give their opinion late at night aren't scared of the approaching reporter asking questions

so those not represented are the ones that walk away from the reporter or those who don't walk late at night

Answer 9

The method of sampling used is
A. simple random sampling.
B. the Gallup Poll.
C. voluntary response.
D. a census.

Next part asked the method.

Answer 10

Also the reported picked randomly, but those who decided to answer mattered as well.

Answer 11

At first I thought it would be A, but it could be C?

Answer 12

well if the reporter had his/her way, then it would ideally be A

Answer 13

but it clearly says "who are WILLING to give their opinion.", so that means what?

Answer 14

C?

Answer 15

yes

Answer 16

The sample is
A. all those students walking on campus late at night.
B. all students at universities with safety issues.
C. the 15 students interviewed.
D. all students approached by the reporter.


Last part I think is C?

Answer 17

So D, C, and maybe C :P

Answer 18

if it were D, then what about the people that turn down the interview? (maybe they're too scared or busy to be talked to...)

Answer 19

Yeah, but I thought the sample is the people actually interviewed for the question at hand, not those who didn't want to answer it....

Answer 20

your thinking is correct, the sample is made up of those who actually participate in the survey

Answer 21

So it is C then? So D C C? Thanks!

Answer 22

@jim_thompson5910

Answer 23

yes all 3 are correct

Answer 24

D C C

Answer 25

Just one thing that still bothers me about that D. The "because" students at night tend to feel safer... But only 15 people agreed, which means there is a percent that don't agree...

Answer 26

not sure what you mean

Answer 27

probably biased because students walking on campus late at night probably tend to feel safer about doing so than does the student body at large.

The sample is biased, but I don't like that reasoning.... It's not true that students walking n campus probably feel safer, only those who answered the question....

Answer 28

well I would argue that those who walk around at night feel safer than those who don't in general

Answer 29

so I don't see anything wrong with the wording

Answer 30

Well sometimes people have late classes, I'm talking about person experiences, from the girl's I've spoken too. Personally I had no issue because I'm an athletic dude.

Answer 31

hmm true, that's a good point, but I think in general (ie say they walk for exercise or going to the store)

Answer 32

yeah... this happened last time I'm not sure what I did LOL!

Answer 33

@CliffSedge what did we doooo?

Answer 34

Why is stats so annoying with this poonany.

Answer 35

besides, which seems more likely

a) finding someone who is rushing to class (because they're afraid to walk late at night)

OR

b) finding someone who is leisurely strolling and enjoying the night air

??

Answer 36

We will deff find B, but who knows if anyone would do that. People might walk slowly; however they might be on high alert, especially females....

Answer 37

why would they walk slowly on high alert? if you sense/fear danger, your immediate response is to get out asap

Answer 38

Yes that's an "IF" doesn't mean all the time... :)

Answer 39

I mean what are we trying to get at?

Answer 40

I'm not saying this is true for all

Answer 41

We only know that she got 15 people, we don't know how many avoided her, and we don't have any other information.

Answer 42

Maybe if we had additional info we could conclude..

Answer 43

but I would think that the ones who are being interviewed are both not afraid of walking late at night and not in a hurry

Answer 44

Is this all still the same question?

Answer 45

Yes true.

Answer 46

That's one aspect of statistics to keep in mind. It tries to encompass everyone, but there are always outliers.

Answer 47

Cliff do you remember last time when we had one of these questions and the "because" didn't make sense?

Answer 48

yeah but we are deff lacking data I feel.. Idk if C would make sense, and A wouldn't make sense if they are saying the students DO feel safe.

Answer 49

because then we would need more data as well.e

Answer 50

another aspect of stats is to deal with all the data you can get your hands on and try to paint a bigger picture with it

there's no way to know everything because if you did, then there wouldn't be a need for stats

Answer 51

I think you are over-thinking.

Answer 52

Maybe >(

Answer 53

But stats is ridic like that....

Answer 54

Which question are you . . . questioning?

Answer 55

It's like a Cobra slithering in the night...... The first one.

Answer 56

The sample obtained is
A. a simple random sample of students feeling safe.
B. a convenience sample of students feeling safe.
C. a random sample of students with night classes.
D. probably biased because students walking on campus late at night probably tend to feel safer about doing so than does the student body at large.

Answer 57

The sample obtained is biased. It is a convenience sample because the reporter chose who to ask without going to too much trouble, but it is also voluntary response. There is always bias with voluntary response.

Answer 58

Yes we agree; however that because makes no sense imo... Sinse some people gave their answer(which we don't know) and a bunch of others(number we don't know) ddin't answer.

Answer 59

hmm maybe the ""probably" in D makes it a non-answer because this type of surveying is *definitely* biased

Answer 60

I think the 'because' statement makes sense. It says "probably," that means there is a possibility of that and if there's that possibility, then it might be biased.

Answer 61

if D said "Is biased because..." or "Is most certainly biased because...", then I'd stick with D

Answer 62

Besides, none of A-C make sense.

Answer 63

Yeah...

Answer 64

B does a bit because this is a convenience sample

Answer 65

But are threy feeling safe?

Answer 66

which is the same as A. C is possble; however not all would have classes late at night.. Some just walk around...

Answer 67

A and C are definitely out because there is no randomization whatsoever.

Answer 68

yeah it's definitely not random

Answer 69

yeah.

Answer 70

if it were truly random, then all of the names of the students would be put in a hat or something and selected at random

Answer 71

And it's not a convenience sample of students feeling safe because you don't know if they feel safe until after you ask them the question.

Answer 72

yeah

Answer 73

Imo it's E.

Answer 74

Also, look at the purpose of the interview, "To assess the opinion of students at the Ohio State University about campus safety,.."
The reporter might interview a student who feels safe himself at that particular moment, but has the opinion that the campus is not safe overall for everyone.

Answer 75

Haha that's funny, one question is this :p


A simple random sample is somewhat analogous to
A. drawing names out of a hat.
B. tossing a coin.
C. using an expert to decide who to include in a survey.
D. none of the above.

Answer 76

Yeah that is true as well.

Answer 77

Yep, 'drawing names from a hat' is the classic simple random sample analogy.

Answer 78

:)

Answer 79

Onward to the next Q, thanks for the tips guys!