Comments on: Mr Brewin’s Year 12 Stats http://www.shsmaths.com/2009/03/mr-brewins-year-12-stats-4/ Tue, 07 Feb 2012 21:11:26 +0000 hourly 1 http://wordpress.org/?v=3.0.4 By: Mrs Tibble http://www.shsmaths.com/2009/03/mr-brewins-year-12-stats-4/comment-page-1/#comment-4951 Mrs Tibble Sun, 17 May 2009 20:37:55 +0000 http://www.shsmaths.com/?p=1108#comment-4951 Hi Celia, Yes, add 1 before dividing by 2 or 4. If you get .5, go halfway between the numbers each side of it. If you get .25, go 1/4 of the way up the difference. If you get .75, go 3/4 of the way up the gap. Hope that makes sense! Mr W is doing some S1 revision with the year 13 retakes tomorrow, so if you're around feel free to pop in. JT Hi Celia,
Yes, add 1 before dividing by 2 or 4.
If you get .5, go halfway between the numbers each side of it.
If you get .25, go 1/4 of the way up the difference.
If you get .75, go 3/4 of the way up the gap.
Hope that makes sense!
Mr W is doing some S1 revision with the year 13 retakes tomorrow, so if you’re around feel free to pop in.
JT

]]> By: Celia http://www.shsmaths.com/2009/03/mr-brewins-year-12-stats-4/comment-page-1/#comment-4950 Celia Sun, 17 May 2009 20:31:38 +0000 http://www.shsmaths.com/?p=1108#comment-4950 My final question or least I hope. When dealing with median should you always add one and divide by 2. And if it is a even number adding one and dividing by 2 you get a .5 number so you add the number either side. when dealing with the continuous data and doing interpolating and you have an even number should you use the .5 number or use the number you would get if you simpley divided by 2. Finally for the upper and lower quartiles add one and divide by four (then times 3 for UQ). you get. 25. do you round up or down or do you add the numbers found to either side of the .25 area and divide by 2. same for continuous should you add one ? Thank you Mrs Tibble been a big help this weekend sorting out the easy but for some reason bothering me bits . Celia My final question or least I hope.

When dealing with median should you always add one and divide by 2. And if it is a even number adding one and dividing by 2 you get a .5 number so you add the number either side.

when dealing with the continuous data and doing interpolating and you have an even number should you use the .5 number or use the number you would get if you simpley divided by 2.

Finally for the upper and lower quartiles add one and divide by four (then times 3 for UQ). you get. 25. do you round up or down or do you add the numbers found to either side of the .25 area and divide by 2. same for continuous should you add one ?

Thank you Mrs Tibble been a big help this weekend sorting out the easy but for some reason bothering me bits .

Celia

]]> By: Mrs Tibble http://www.shsmaths.com/2009/03/mr-brewins-year-12-stats-4/comment-page-1/#comment-4949 Mrs Tibble Sun, 17 May 2009 12:04:03 +0000 http://www.shsmaths.com/?p=1108#comment-4949 Hi Celia, I've looked at a mark scheme and it said 3sf or better, so I would go with 3sf in the absence of any guidance. JT Hi Celia,
I’ve looked at a mark scheme and it said 3sf or better, so I would go with 3sf in the absence of any guidance.
JT

]]> By: Celia http://www.shsmaths.com/2009/03/mr-brewins-year-12-stats-4/comment-page-1/#comment-4948 Celia Sun, 17 May 2009 09:22:53 +0000 http://www.shsmaths.com/?p=1108#comment-4948 With lines of regression calculations for the final answer a +bx should a and b be done to 3sf or 2dp? Thanks With lines of regression calculations

for the final answer a +bx should a and b be done to 3sf or 2dp?
Thanks

]]> By: Mrs Tibble http://www.shsmaths.com/2009/03/mr-brewins-year-12-stats-4/comment-page-1/#comment-4947 Mrs Tibble Fri, 15 May 2009 17:36:50 +0000 http://www.shsmaths.com/?p=1108#comment-4947 Yes - cos it's just change side, change sign for the two terms. Yes – cos it’s just change side, change sign for the two terms.

]]> By: Celia http://www.shsmaths.com/2009/03/mr-brewins-year-12-stats-4/comment-page-1/#comment-4946 Celia Fri, 15 May 2009 17:34:50 +0000 http://www.shsmaths.com/?p=1108#comment-4946 sorry to bother again, for the formula P(A)+P(B)- P(AnB)= P(AuB) The u one and and n can be switched round? thanks sorry to bother again, for the formula P(A)+P(B)- P(AnB)= P(AuB)

The u one and and n can be switched round?
thanks

]]> By: Mrs Tibble http://www.shsmaths.com/2009/03/mr-brewins-year-12-stats-4/comment-page-1/#comment-4945 Mrs Tibble Fri, 15 May 2009 17:23:58 +0000 http://www.shsmaths.com/?p=1108#comment-4945 Hi Celia, First letter is a capital. JT Hi Celia,
First letter is a capital.
JT

]]> By: Celia http://www.shsmaths.com/2009/03/mr-brewins-year-12-stats-4/comment-page-1/#comment-4944 Celia Fri, 15 May 2009 17:10:23 +0000 http://www.shsmaths.com/?p=1108#comment-4944 tried the thing you told Jacynth and couldn't get in. Has the password been changed? thanks tried the thing you told Jacynth and couldn’t get in. Has the password been changed?

thanks

]]> By: Celia http://www.shsmaths.com/2009/03/mr-brewins-year-12-stats-4/comment-page-1/#comment-4943 Celia Fri, 15 May 2009 17:04:10 +0000 http://www.shsmaths.com/?p=1108#comment-4943 Mr Brewin, Sorry to bother you but in the stats textbook chp 5 mixed exercise for question 5b. If you did 6 x ×7 /15×3 /14 ×5 /13 or went through the whole tree diagram doing each route then adding together would you get the same answer? Which way would you suggest? Thanks Mr Brewin,

Sorry to bother you but in the stats textbook chp 5 mixed exercise for question 5b. If you did 6 x ×7 /15×3 /14 ×5 /13

or went through the whole tree diagram doing each route then adding together would you get the same answer?

Which way would you suggest?

Thanks

]]> By: Mr Brewin http://www.shsmaths.com/2009/03/mr-brewins-year-12-stats-4/comment-page-1/#comment-4942 Mr Brewin Wed, 29 Apr 2009 21:06:44 +0000 http://www.shsmaths.com/?p=1108#comment-4942 Err... can't really say exactly, but what's the local area our school is in? Try that! Err… can’t really say exactly, but what’s the local area our school is in? Try that!

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