For the normal distribution Q I believe it's 21.25 as I took the part less than 15 which was 0.242 and added it to .5 so I got 0.7420 and looked it up in the table closest to it was 0.7422 which was 0.65 so I did .65 x 5 = 3.25 and added 18 so I got 21.25

(edited 6 years ago)

Reply 27

icecubeinferno

YEAH! got all these right! I only missed out the 5 marker on the normal distribution though.

Reply 28

Aceofall

Original post by ErinMei

It asked for the regression line in terms of w not s

Posted from TSR Mobile

It asked for w then s

Reply 29

Lilith2400

Original post by stephaniecheung

how can your regression line be -655 when b is Sst/ Sss and that gives like -980????

It asked for the regression line in terms of w & t not s

Posted from TSR Mobile

Reply 30

EpicMan

5. a) 0.3 something
5. b) P(T>20)/P(T>15) = 0.4-5 something

Reply 31

Adnan1996

Question 1 - last part (the 1 degree thing) - how many marks was it worth?

Reply 32

Lilith2400

Original post by Aceofall

It asked for w then s

Yeah it did. When you change the variables of the regression line you sub in the coding so you would have s/1000 = 20.0 -0.655t and then multiply by 1000

Posted from TSR Mobile

Reply 33

Cor395

for the P(T<asnasf) stuff one of the questions was P(T>20)=P(Z>0.4)=0.3446
and one question was P(T>20) given P(T>15): which was for P(T>15) = P(Z>-0.6)= P(Z<0.6) so the answer was 0.7257 then 0.3446/0.7257 = 0.475

(edited 6 years ago)

Reply 34

uphabarclay

Original post by stephaniecheung

how can your regression line be -655 when b is Sst/ Sss and that gives like -980????

Yeh I got -980

Reply 35

Sohie Johstone

for part 5c) i did P (T>15) =1
P (Z>(15-u)/5)=1
so (-15+u)/5 = 4
u =35 = median

Reply 36

kayamh

For Sss
isn't it Sww * (1/1000)^2
= 0.00005

Reply 37

danzas4321

Original post by ErinMei

Yeah it did. When you change the variables of the regression line you sub in the coding so you would have s/1000 = 20.0 -0.655t and then multiply by 1000

Posted from TSR Mobile

Yes but b was equal to Swt/Sww meaning it was -49/50, leading to an a value of 7-((49/50)/119/6) which was like 24.64 or something as the a value, which then got the -980t which is what me and others have been getting. I don't understand where the 0.655
Comes from.

Reply 38

Epistemolog y

the expectance and variance question the ones I think I only did well on :frown:

Reply 39

Florent venhari

Original post by Aceofall

So I definitely know I got q1 b and q5 c wrong but I got everything else right.

That would be pretty much 0.906

Now I'm just hoping for low grade boundaries. Thanks for the answers

I think i got the exact same questions wrong as u lol we might get method marks though

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