binomial dist : ( (1 Viewer)

[carrotsss]

View attachment 40123
this is using sample sum ^^ could someone explain this a bit to me cuz i can do it but i dont fully get it. like i can do the formulas but not the S = 5x60 and why we do that and set up Pr < 300 etc using the sample sum.
I haven't done any sample sum questions.

So we can serve 5 people at the time and there’s 60 minutes, so there is effectively 300 minutes of people being served happening. We need to find the probability that if we pick the first 50 people in line, the total time that they take is less than 300 minutes so that they can all be served within the hour

does that make cents?

 

[synthesisFR]

So we can serve 5 people at the time and there’s 60 minutes, so there is effectively 300 minutes of people being served happening. We need to find the probability that if we pick the first 50 people in line, the total time that they take is less than 300 minutes so that they can all be served within the hour

does that make cents?

OHHH yeah kinda which is why we convert it to a sample sum instead
thanks

 

[synthesisFR]

this but asking people for help on this thread

TikTok - Make Your Day

 

[carrotsss]

this but asking people for help on this thread

TikTok - Make Your Day

this will definitely dox but that guy used to be on my soccer team wtf

 

[carrotsss]

this will definitely dox but that guy used to be on my soccer team wtf

and also how tf can he be saying that, he always begged for money from people and NEVER paid them back

 

[synthesisFR]

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Im pretty sure we need to know all this except for the third image right?
Apparantly the teacher skipped B)Sampling without replacement (third image)
and Also apparently skipped continuity correction because you dont need it for the hsc????

i kinda understand the second picture which talks about sample proportion but could someone explian it a bit more

 

[carrotsss]

i kinda understand the second picture which talks about sample proportion but could someone explian it a bit more

which part more specifically sorry

 

[synthesisFR]

which part more specifically sorry

sorry dw for the third image do we need to know how to do those

 

[carrotsss]

sorry dw for the third image do we need to know how to do those

sampling without replacement? yes definitely

 

[synthesisFR]

sampling without replacement? yes definitely

no like not the big samples the small ones :/

 

[carrotsss]

no like not the big samples the small ones :/

yeah?

 

[synthesisFR]

yeah?

its not even a normal dist then its just a table

 

[synthesisFR]

@carrotsss im unsure of the purpose of sample proportions? like both methods work so idk what the point of using the sample proportion is? is it for like specific questions where u can't use the first method but i don't understand where that would be the case? could u explain what is going on?

 

[carrotsss]

View attachment 40130
@carrotsss im unsure of the purpose of sample proportions? like both methods work so idk what the point of using the sample proportion is? is it for like specific questions where u can't use the first method but i don't understand where that would be the case? could u explain what is going on?

it doesn’t rlly matter which one you use they’re pretty much just the same thing except in one everything is divided by n

 

[synthesisFR]

View attachment 40130
@carrotsss im unsure of the purpose of sample proportions? like both methods work so idk what the point of using the sample proportion is? is it for like specific questions where u can't use the first method but i don't understand where that would be the case? could u explain what is going on?

sorry im legit so lost whats going on
in the picture here i used the sample mean to solve it and thats a different fomula as well
im so confused which one to use for which
is it just a matter of variables that they give then e.g if they give std deviation then i use this one
if they give probability then i can use either the binomial np stuff directly or the sample proportion formulas?

 

[synthesisFR]

View attachment 40130
@carrotsss im unsure of the purpose of sample proportions? like both methods work so idk what the point of using the sample proportion is? is it for like specific questions where u can't use the first method but i don't understand where that would be the case? could u explain what is going on?

also for method one here why do we do 42-40/sqrt 24
bc isnt 42 a percentage so how come we subtract the expected value bc thats a number from the sample
IM SO CONFUSED I HATE THIS TOPIC

 

[carrotsss]

also for method one here why do we do 42-40/sqrt 24
bc isnt 42 a percentage so how come we subtract the expected value bc thats a number from the sample
IM SO CONFUSED I HATE THIS TOPIC

What is 42% of 100

 

[carrotsss]

View attachment 40132
sorry im legit so lost whats going on
in the picture here i used the sample mean to solve it and thats a different fomula as well
im so confused which one to use for which
is it just a matter of variables that they give then e.g if they give std deviation then i use this one
if they give probability then i can use either the binomial np stuff directly or the sample proportion formulas?

yeah pretty much just use whatever u want

 

[synthesisFR]

What is 42% of 100

shut up

 

[synthesisFR]

yeah pretty much just use whatever u want

THERES FOUR SETS OF THE SAME FORMULA NOW