# How was Edexcel S2?

Watch
Announcements

This discussion is closed.

Report

#101

(Original post by

You only HAD to use the continuity correction once but if you decided to use the normal instead of the poisson for an earlier question then you should have done it twice.

**Leekey**)You only HAD to use the continuity correction once but if you decided to use the normal instead of the poisson for an earlier question then you should have done it twice.

I used the poission Yay thank you

0

Report

#102

Is it just me, or is everyone else thinking the grade boundaries are going to shoot up for S2 this year...

0

Report

#103

(Original post by

Is it just me, or is everyone else thinking the grade boundaries are going to shoot up for S2 this year...

**Mysticmin**)Is it just me, or is everyone else thinking the grade boundaries are going to shoot up for S2 this year...

0

Report

#104

(Original post by

Don't say that, I'll lose all confidence in getting that B.

**Leekey**)Don't say that, I'll lose all confidence in getting that B.

0

Report

#105

(Original post by

yea that's rite. The median(1.4) was greater then the mean (1.21111? i think) therefore negative skew

**DaKe**)yea that's rite. The median(1.4) was greater then the mean (1.21111? i think) therefore negative skew

I thought that the skew was negative. I got stuck on this question for a while and ended up drawing a sketch to see what was going on. The mode was way over to the right with the mean somewhere to the left, so the tail was pointing towards the negative numbers, so hence negatively skewed.

John

0

Report

#106

Wasnt 2)a) 0.74 rather than 0.54 as many people have said. (2.7+1)/5 = 0.74

Was the one approximated by the normal distribution 0.1847?

Was the one approximated by the normal distribution 0.1847?

0

Report

#107

(Original post by

Wasnt 2)a) 0.74 rather than 0.54 as many people have said. (2.7+1)/5 = 0.74

Was the one approximated by the normal distribution 0.1847?

**sideshowbob**)Wasnt 2)a) 0.74 rather than 0.54 as many people have said. (2.7+1)/5 = 0.74

Was the one approximated by the normal distribution 0.1847?

0.1847 looks vaguely familiar but I cant remember to be honest.

0

**sideshowbob**)

Wasnt 2)a) 0.74 rather than 0.54 as many people have said. (2.7+1)/5 = 0.74

Was the one approximated by the normal distribution 0.1847?

0

Report

#112

(Original post by

P(Z>= (21.5 – 17.5)/(Rt 17.5))

= 1- P(Z<= 0.89)

= 0.1847

Agree?

**sideshowbob**)P(Z>= (21.5 – 17.5)/(Rt 17.5))

= 1- P(Z<= 0.89)

= 0.1847

Agree?

0

Report

#114

(Original post by

Usually to works like....

-Correct hypothesis

-Correct interpretation of distribution

-Correct probability

-Correct n value

-Correct comparison with sig level

-Correct in rejecting / not rejecting H0

-Correct in interpreting result of rejecting / not rejecting

**Leekey**)Usually to works like....

-Correct hypothesis

-Correct interpretation of distribution

-Correct probability

-Correct n value

-Correct comparison with sig level

-Correct in rejecting / not rejecting H0

-Correct in interpreting result of rejecting / not rejecting

0

Report

#115

(Original post by

i think it should be 1/5 * 2.7 = 0.54

**RussianDude**)i think it should be 1/5 * 2.7 = 0.54

0

How many marks would i loose if i forgot about the interpolation in q 6)d)?

0

Report

#117

(Original post by

Nah i dont think so mate, cos i did that first but then realised that its u have to do it for -1<=x<=2.7, therefore the difference is 3.7 and so u do 1/5*3.7 which gives 0.74 and not 0.54

**DaKe**)Nah i dont think so mate, cos i did that first but then realised that its u have to do it for -1<=x<=2.7, therefore the difference is 3.7 and so u do 1/5*3.7 which gives 0.74 and not 0.54

ITS OBVIOUS

...lets stop discussing it....

0

Report

#118

(Original post by

How many marks would i loose if i forgot about the interpolation in q 6)d)?

**RussianDude**)How many marks would i loose if i forgot about the interpolation in q 6)d)?

0

Report

#120

CONTINUITY even!! im so glad i didnt have to write that in my english lit. exam, id have most certainly spelt it wrong!!

0

X

new posts

Back

to top

to top