-
We need your support!
We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
Click here to Donate Now (View Announcement)
Search results
-
-
-
statistics A2 level: post doubts here
The mean was averaged from 60 samples. So divide s.d by sqrt 60. Also, everyone else who wants help should actually post here, and should actually show some form of working, otherwise I'm just going to ignore. I don't want to do whole problems when you could look at the mark scheme. -
statistics A2 level: post doubts here
He wants to know when to use x>19.4 or x<19.4 when finding the rejection region. You can tell, because if you think of it as on a side of the mean, you need to find the rejection region for that side. Hard to explain, hit the books on when to use them if you're still unsure. -
statistics A2 level: post doubts here
If it's below the mean use <19.4. If above use >19.4 -
statistics A2 level: post doubts here
Didn't I explain it? Remember what the definition of Type 1 error is, then apply to the situation like I did. "Type 1 error is the probability that you reject the claim that it is 20% red for sugar-coated chocolate beans when they actually are 20%." That's pretty much the answer. Man, I... -
statistics A2 level: post doubts here
The thing is that you can. They're using 10%, but finding the probability of P(X=1) and then doubling it to account for P(X=9) and likewise for the other probabilities. You could do that, or you could just focus on one side and half it to 5%. I'll hang around here for most of the time until... -
statistics A2 level: post doubts here
Oh damn. I forgot that since it was two tailed, you'd account for the other end of the spectrum as well... Well the working that I did above still holds. I did it for two tailed, so that the probability would be less than 0.05 on one side. Which is still the values of 0 and 1. Then you need to... -
statistics A2 level: post doubts here
For this you need to realise that these are discrete values. The Type I error is at most 0.1. Null hypothesis is when p = 0.5. Alternative hypothesis is p does not equal to 0.5. Therefore this is a two tailed test. X~B(10, 0.5) P(X=0) = 0.000976562 P(X=1) = 0.009765625 P(X=2) =... -
statistics A2 level: post doubts here
Type 1 error is the probability of rejecting a null hypothesis when it is actually true. So in this example here, using reference to the situation, you'd say that: Type 1 error is the probability that you reject the claim that it is 20% red for sugar-coated chocolate beans when they actually are...
