OCR MEI Statistics 1 (S1)

Original post by nicknickmac

Did anyone else get about 850cm^3 for the standard deviation of the engine size? x

yep 849 for s.d

and 1800 something for mean

For hypothesis testing anyone get crit region {4,5,6,7,8,9,10....18}? so reject h0?

Reply 42

Richardbrown

any thoughts on grade boundaries :frown:

Reply 43

nicknickmac

Original post by dayofs

yep 849 for s.d

and 1800 something for mean

For hypothesis testing anyone get crit region {4,5,6,7,8,9,10....18}? so reject h0?

yay. had massive problems with finding Sxx before the exam :colondollar:

erm i got that you reject H0 but did it ask for the critical region? x

Reply 44

ye reject h0 !! did people get that there were outliers at the upper end but none at the lower end

Reply 45

ye i got 0.009 something for the last question.. there were 10 possibilities!!!

Reply 46

m rowe29

4

Original post by sreddy17

ye reject h0 !! did people get that there were outliers at the upper end but none at the lower end

Yep, i got my upper fence to be 3200something and my lower on the be 240something

Reply 47

Alotties

10

I answered all the questions but idk if I did it right!
That's what I hate about stats, you can think you're on the right lines and getting the answer and the mark scheme has something totally different :tongue:

I hope I did okay :smile:

Reply 48

alex7892

2

Wait was the standard deviation not 500 and something and the mean was like 1029 or something?? Omg must of made an error? :/ I thought the paper was okay though anyone making a mark scheme? Also, I got 0.00939 or something like that for the last question :smile:

Reply 49

Alotties

10

Original post by alex7892

Wait was the standard deviation not 500 and something and the mean was like 1029 or something?? Omg must of made an error? :/ I thought the paper was okay though anyone making a mark scheme? Also, I got 0.00939 or something like that for the last question :smile:

I think I got the same as you for the SD and mean but I can't really remember to be honest, I don't know what I got for the last question because I did all the questions in different orders :tongue:

Reply 50

Original post by nicknickmac

yay. had massive problems with finding Sxx before the exam :colondollar:

erm i got that you reject H0 but did it ask for the critical region? x

nope, I just have the habit of doing it! dont worry

Reply 51

timincognito

1

I put accept H0 instead of H1 because I didn't realise you could accept H1. I know i got all other working correct, except I said you reject H0 if the answer is higher than the sig level. Would I only lose 1 mark?

Btw does anyone have any idea what the grade boundaries will be like?

Reply 52

Original post by timincognito

I put accept H0 instead of H1 because I didn't realise you could accept H1. I know i got all other working correct, except I said you reject H0 if the answer is higher than the sig level. Would I only lose 1 mark?

Btw does anyone have any idea what the grade boundaries will be like?

Normally in the ms you could lose 1 for not saying there is enough/not enough evidence to reject H0 and a right conclusion which in this case is rejecting H0 so you could lose 2 out of 8.

In my school half found it hard and half found it quite normal. So grade boundary could be low. Let's us hope so :biggrin:

Reply 53

Original post by m rowe29

Yep, i got my upper fence to be 3200something and my lower on the be 240something

around the same, so the upper extereme is at 5000 which is more than 3200 so we can conclude there is an outliers !

Reply 54

what did people get for the population one with 8%... for i) did u guys just do 0.92x0.92x0.08

Reply 55

Original post by sreddy17

what did people get for the population one with 8%... for i) did u guys just do 0.92x0.92x0.08

Yep same for the first part, nnot qute sure what was the question for the first part

Reply 56

Alotties

10

Original post by sreddy17

what did people get for the population one with 8%... for i) did u guys just do 0.92x0.92x0.08

I did that :smile:

I couldn't think of any other possibilities so I left it as that :tongue:

Reply 57