A level Statistics doubt??Post your doubts here!

[syed1995]

Aoa wr wb
Can someone please tell me, how do we know when we have to use what value
eg for this qn, how do we know it's 5 rather than 4.5 rather than 4.5 etc

View attachment 26504


PS: I know HOW to solve the qn, ie the method and all, my only doubt is how do we know the value to use (as mentioned above)

Thank you

Link the paper mate

 

[Soldier313]

Link the paper mate

Here, it's qn 2 :
http://papers.xtremepapers.com/CIE/...AS Level/Mathematics (9709)/9709_s05_qp_6.pdf
http://papers.xtremepapers.com/CIE/...AS Level/Mathematics (9709)/9709_s05_ms_6.pdf

 

[Alice123]

littlecloud11 syed1995
If it doesnt waste much of your time, can u draw a diag to explain the lower and upper whisker limits including lowest value, Q1, Q2,Q3, highest value and outliers?? i dnt knw what an outlier is. Your help will be highly appreciated

 

[syed1995]

Here, it's qn 2 :
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s05_qp_6.pdf
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s05_ms_6.pdf

No clue :S shouldn't it be 4.5 over here? :\

 

[syed1995]

littlecloud11 syed1995
If it doesnt waste much of your time, can u draw a diag to explain the lower and upper whisker limits including lowest value, Q1, Q2,Q3, highest value and outliers?? i dnt knw what an outlier is. Your help will be highly appreciated

 

[Soldier313]

No clue :S shouldn't it be 4.5 over here? :\

yep that's exactly what i thought :/

 

[syed1995]

yep that's exactly what i thought :/

SOMETHING USEFUL on the matter...

"You add and deduct 0.5 when ur class boundries are nt continuous.. Check the 6th question-http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w09_qp_62.pdf
Since the boundries are not continuous u take 0.5-20.5, then next one 20.5-30.5, next 30.5-40.5 and so on.. So for the 1st value u minus 0.5 and the second value add 0.5.
When it comes to the mean in grouped frequency: take the midvalue of the class boundry,and in the case of this 6th question, that is done by adding (1+21)/2 * ur frequency and do it in the same manner add ur answrs and divide by the total!"

In this case since they are continous we won't add/subtract 0.5 from it! just do (0+10)/2

 

[Soldier313]

SOMETHING USEFUL on the matter...


In this case since they are continous we won't add/subtract 0.5 from it! just do (0+10)/2

ow okayy, thank you so much for that!

 

[Alice123]

how do we determine the outliers with the formula??? I knw 2 of dem, bt dnt knw how they're used
lower whisker limit=Q1+1.5(Q3-Q1)
upper whisker limit=Q3+1.5(Q3-Q1)
and where are the outliers???

 

[syed1995]

how do we determine the outliers with the formula??? I knw 2 of dem, bt dnt knw how they're used
lower whisker limit=Q1+1.5(Q3-Q1)
upper whisker limit=Q3+1.5(Q3-Q1)
and where are the outliers???

Dude what are you talking about?

Q1 = 1/4 * Total Frequency
Q2 = 2/4 * Total Frequency
Q3 = 3/4 * Total Frequency
Max Value is the last value of frequency
Min Value is the first value of frequency

And What we write in those places is the corresponding value of x on those frequencies.

 

[felicia tan]

sorry i m not neat!

thanks!!!

 

[Champ101]

Find the number of different selections of 4 letters from the 9 letters of the word HAPPINESS which contain no Ps and either one or two Ss.

How to solve this one?

 

[panoramafolks]

Aoa wr wb
Can someone please tell me, how do we know when we have to use what value
eg for this qn, how do we know it's 5 rather than 4.5 rather than 4.5 etc


PS: I know HOW to solve the qn, ie the method and all, my only doubt is how do we know the value to use (as mentioned above)

Thank you

sorry if i m not neat.....

 

[syed1995]

Find the number of different selections of 4 letters from the 9 letters of the word HAPPINESS which contain no Ps and either one or two Ss.

How to solve this one?

4 letters from HAINESS where 1 is already S or 2 are S.

There are 2 S and 5 other letters..

S _ _ _ or S S _ _

2C1*5C3 or 2C2*5C2

2C1*5C3 + 2C2*5C2
= 30 Ways.

 

[panoramafolks]

Can u fill up this table for me?? I am not getting how the answer is as it is >_<

 

[Champ101]

4 letters from HAINESS where 1 is already S or 2 are S.

There are 2 S and 5 other letters..

S _ _ _ or S S _ _

2C1*5C3 or 2C2*5C2

2C1*5C3 + 2C2*5C2
= 30 Ways.

Even i got 30. But the answer is 20.

 

[littlecloud11]

how do we determine the outliers with the formula??? I knw 2 of dem, bt dnt knw how they're used
lower whisker limit=Q1+1.5(Q3-Q1)
upper whisker limit=Q3+1.5(Q3-Q1)
and where are the outliers???

Alice, you don't have to place the outliers when they ask you to plot a box-and-whisker diagram. Just put the min. max. values and Q1, Q2 and Q3.
In case, you are asked to put the outliers you show them as dots like the two above.

 

[Soldier313]

sorry if i m not neat.....

View attachment 26521

Thank you for that.

 

[Alice123]

View attachment 26526

Alice, you don't have to place the outliers when they ask you to plot a box-and-whisker diagram. Just put the min. max. values and Q1, Q2 and Q3.
In case, you are asked to put the outliers you show them as dots like the two above.

thanks for letting me know... i had a question like dat in my mock, where it was asked to show outliers with stars..

 

[Kumkum]

Even i got 30. But the answer is 20.

this is how u do it....if m not mistaken
since no P's should be included but either an S or two S's u'll have to choose 4 letters from the word HAINE
first option one S should be included, so u can have options like HAIS or HINS or HNSE etc, hence number of ways would be 5C3
second option, both S's should be included, so u can have options like HASS or HISS or HNSS etc, hence choosing 4 letters u'd have 5C2
now add both u'll get ur answer as 20.
hope i was clear enough

syed1995 nd Champ101