anonymous
  • anonymous
Identify the bias in each sample. a) A phone-in radio show asks callers their opinion about the city's baseball team not making the playoffs the day after they are eliminated. b) To learn which team Canadians feel will win the stanley cup, researchers call 100 people from ottawa. c) To find the age that most canadians feel should be the legal driiving age, researches ask 3000 high school students.
Mathematics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
please help me someone : (
anonymous
  • anonymous
\[a) voluntary response bias b)inadequate sample size c) \]
anonymous
  • anonymous
c)..?

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anonymous
  • anonymous
i didnt understand b ..!
anonymous
  • anonymous
meaning it's biased because it didn't adequately... ok. what I said was wrong. I think it is basically convenience sampling.
anonymous
  • anonymous
i guess your right
anonymous
  • anonymous
the third one is i think exactly the same reason.
anonymous
  • anonymous
so third one is convenience sampling too?
anonymous
  • anonymous
that's my guess
anonymous
  • anonymous
next question it says that . Sugeest a way to reduce the bias in each sample in this question
anonymous
  • anonymous
a) stratified random sampling b) stratified random sampling c) two stage cluster sampling
anonymous
  • anonymous
can i ask you a question?? what does bias mean .. like i dont get it
bahrom7893
  • bahrom7893
bias is like somebody is going to respond that way, ur data will be skewed, for example:
bahrom7893
  • bahrom7893
if u go to a rich neighborhood and ask them whether rich ppl should pay more taxes,
bahrom7893
  • bahrom7893
they will say NO, and if u go to a poor neighborhood and ask whether rich ppl should pay more taxes ppl are more likely to say yes... So both responses are biased
bahrom7893
  • bahrom7893
Basically u give a biased response if u get something sort of like profit from it..
anonymous
  • anonymous
o okay :) i get it
anonymous
  • anonymous
basically bias is when the sample mean is different from the true population mean
anonymous
  • anonymous
so why biased sample may not produce accurate results?
bahrom7893
  • bahrom7893
because you won't get accurate results..
anonymous
  • anonymous
because of methods you use
bahrom7893
  • bahrom7893
woops sorry lol, I meant because biased data is just like BSed data
bahrom7893
  • bahrom7893
ill let moo explain it lol I've never been good at stat.. Any calculus questions?
anonymous
  • anonymous
can u help me with statistic questions?
anonymous
  • anonymous
?? please"
bahrom7893
  • bahrom7893
i can try..
anonymous
  • anonymous
One way to judge the sucess of a movie is to rank it by ticket sales. however, tickets are more expensive today and theatres hold more people than in the past. suggest a way to remove these biases so that past and present movies can be compared fairly.
bahrom7893
  • bahrom7893
well the top option would be make the tickets cheap.
anonymous
  • anonymous
ok??
bahrom7893
  • bahrom7893
Not free, because then rich people would think that this movie is trash which is why they are giving away the tickets.. so you would only get responses from the rich
bahrom7893
  • bahrom7893
*sorry meant: Not free, because then rich people would think that this movie is trash which is why they are giving away the tickets.. so you would only get responses from the poor people who would take the tickets
bahrom7893
  • bahrom7893
and if the ticket prices were high, then poor people wouldnt be able to afford them and you would get responses from only rich people
bahrom7893
  • bahrom7893
and to minimize bias you want responses from both rich and poor people, u need diversity
anonymous
  • anonymous
oh okk :)
anonymous
  • anonymous
can i ask next q?
bahrom7893
  • bahrom7893
sure..but i am pretty bad at stat if i can't do it then sorry..
anonymous
  • anonymous
sure :)
bahrom7893
  • bahrom7893
its just that my stat teacher was really bad, but i will attempt ur question
anonymous
  • anonymous
ok
anonymous
  • anonymous
a popular television sports show asked people to phone in their pick for the NBA Most Valuable player. with 30 min left in the show, they announce the result to that point. a) how might this announcement affect the outcome of the survey? b) Does reporting the early results make the survey biased? explain why or why not?
bahrom7893
  • bahrom7893
Okay first of all a) you will definitely get biased results, and you always want to avoid them.
bahrom7893
  • bahrom7893
b is easy
bahrom7893
  • bahrom7893
b) Reporting survey earlier would decrease the bias because look, it is the end of the game right, and suppose you were going to vote for player A, but turns out player B scored more goals or whatever u call em in basketball (sorry i hate american sports), so you will end up picking player B if you choose when there's 30 mins left..
bahrom7893
  • bahrom7893
And if you are reporting it early, then player A and B would have equal chances, because you don't know who is going to perform better..
anonymous
  • anonymous
ooo
bahrom7893
  • bahrom7893
do you kind of get it? If nothing affected your vote then it would NOT be biased, but halfway into the match, you see one guy is better than the other, so something is affecting your vote
anonymous
  • anonymous
next question is : Melissa asks five of her friends about their favourite type of movie. Four say their fav is comedy. She reports that 80% of teenagers prefer comedies over all other movie types. explain two flaws in her survey.
bahrom7893
  • bahrom7893
her sample size is too small..
bahrom7893
  • bahrom7893
or not sample size, i mean whatever you call it, you can't get sufficient data from only 5 people
bahrom7893
  • bahrom7893
okay it is called a sample size, just looked it up lol
anonymous
  • anonymous
lol
bahrom7893
  • bahrom7893
so now she should NOT have asked her friends who are each others' friends too, because most friends share common tastes, so they all would like comedies, or tragedies or whatever..
bahrom7893
  • bahrom7893
i mean friends tend to have same tastes don't they.. all of my friends like math lol ..well sorta..
anonymous
  • anonymous
yea right :P
bahrom7893
  • bahrom7893
any more?
anonymous
  • anonymous
A local soccer league wants to give its players a bonus: either free soccer balls, free movie tickets , ir coupons for the snack bar. a) Design a survey the league can use to decide which bounus to offer. b) how can the data be collected? c) is it possible to survey the whole population?? explain?
anonymous
  • anonymous
??
bahrom7893
  • bahrom7893
thinking..
anonymous
  • anonymous
ok
bahrom7893
  • bahrom7893
uhmm i dont get it what is the survey about? do we have to ask whether they want one of those options? either free soccer balls, free movie tickets , ir coupons for the snack bar?
anonymous
  • anonymous
yessss i gues we need to ask :S
bahrom7893
  • bahrom7893
well i guess for part A: We could either mail them letters or something asking what they would prefer, or email them or call them, etc.. B: Let soccer balls be 1 tickets - 2 coupons - 3, ask whichever they prefer and record the number then see how many counts of each number we have..
bahrom7893
  • bahrom7893
C: It is never possible to interview the whole population, because some people will think its a scam and not respond, others will just think that its a joke or something and just respond with a random number without actually thinking about what they want..
bahrom7893
  • bahrom7893
post the next one..
anonymous
  • anonymous
explain the difference between response bias and non- response bias. b) are two biases opposites? explain. c) Giv an example of each.
bahrom7893
  • bahrom7893
THIS CALLS FOR SOME GOOGLINGG!! LOL afk.. lookin
anonymous
  • anonymous
hahaha :P man google dosnt make any sense :P coz i need to understand what it is :P lol
bahrom7893
  • bahrom7893
Non response bias is NOT the opposite of response bias.. that's as much as i know so far..
bahrom7893
  • bahrom7893
okay I know what a response bias is: It occurs when the survey takers says something that he or she thinks the surveyor wants to hear from them.
bahrom7893
  • bahrom7893
For example: A teacher asks the kids DID YOU DO YOUR HOMEWORK??? Kids will respond of course we did, because they think they will get punished otherwise..
bahrom7893
  • bahrom7893
that's response bias..
anonymous
  • anonymous
o
anonymous
  • anonymous
non response is basicaly oppsite of that .. right?
bahrom7893
  • bahrom7893
no its not
anonymous
  • anonymous
outch
bahrom7893
  • bahrom7893
so that's half of part a and c so far, let me understand what non response bias is..
bahrom7893
  • bahrom7893
Okay non response bias is basically when you don't respond
anonymous
  • anonymous
thats what i said lol
bahrom7893
  • bahrom7893
well u don't DON'T respond just because u think u will be punished or lose something..
anonymous
  • anonymous
is tht it?
bahrom7893
  • bahrom7893
no, imagine this
anonymous
  • anonymous
did u answer b ??
bahrom7893
  • bahrom7893
yeah thats b
bahrom7893
  • bahrom7893
they are not opposites..
bahrom7893
  • bahrom7893
c) Response bias: teacher : "did u do ur hw?" kids: "yes" even though maybe they didnt Non- response bias:
bahrom7893
  • bahrom7893
Imagine a guy standing on the corner of Lexington ave and 23rd street in manhattan asking college kids rushing by whether they want to take a survey.. Most of them including me would say NO, simply because they don't have time..
bahrom7893
  • bahrom7893
Lex and 23rd is crazy.... especially durin breaks in b/n classes...=(
bahrom7893
  • bahrom7893
so that's C, now for A
anonymous
  • anonymous
u told me a already dude
bahrom7893
  • bahrom7893
oh okay.. =)
bahrom7893
  • bahrom7893
sorry im like helpin 3 ppl, hard to keep track... im such a nerd -_-...
bahrom7893
  • bahrom7893
i should be enjoying life, but here i am stuck helpin others, i think i should log off...
bahrom7893
  • bahrom7893
holy ship 92 replies? *this is 93rd..
anonymous
  • anonymous
heyy thankyouu soo much.. i was writing the answer :SS :) ur really halpful thanks a lot
bahrom7893
  • bahrom7893
ready to help with math only... maybe I should become a math teacher lol, I hate teaching and tutoring, but somehow im okay at it..

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