Kelly wants to know if the number of words on a page in her geometry book is generally more than the number of words on a page in her science book. She takes a random sample of 25 pages in each book, then calculates the mean, median, and mean absolute deviation for the 25 samples of each book.

Book |Mean|Median|M.a.d
Geometry | 42.9|40 |1.2
Science | 48.5|42 |9.3

Kelly claims that because the mean number of words on each page in the science book is greater than the mean number of words on each page in the geometry book, the science book has more words per page. Based on the data, is this a valid inference?
No, because the mean is larger in the science book
No, because there is a lot of variability in the science book data
Yes, because the mean is larger in the science book
Yes, because there is a lot of variability in the science book data

Question

Kelly wants to know if the number of words on a page in her geometry book is generally more than the number of words on a page in her science book. She takes a random sample of 25 pages in each book, then calculates the mean, median, and mean absolute deviation for the 25 samples of each book.

Book	  |Mean|Median|M.a.d
Geometry |	42.9|40	       |1.2
Science      |	48.5|42        	|9.3

Kelly claims that because the mean number of words on each page in the science book is greater than the mean number of words on each page in the geometry book, the science book has more words per page. Based on the data, is this a valid inference?
 No, because the mean is larger in the science book
 No, because there is a lot of variability in the science book data
 Yes, because the mean is larger in the science book
 Yes, because there is a lot of variability in the science book data

crispyrat · Answer

so the mean is the average of words
if i had 3 cakes and the mean of the calories was 500
then the 3 cakes had 3*500=1500 calories
so first lets figure out if the answer is yes or no
is 42.9*25 greater or 48.5*25 greater

Rx1nyDxyz · Answer

48.5 x 25 is greater

crispyrat · Answer

so since that is science then that means that what she is saying is true or yes
now variability means 
"lack of consistency or fixed pattern; liability to vary or change."--oxford language
do you think this would affect the average if to find the average you add everything together and then divide by how many there is

Rx1nyDxyz · Answer

i think it would?

crispyrat · Answer

think again
lets go back to the three cake example
would it matter if my cakes were 1000,250,250
or they were all 500
try doing the math

crispyrat · Answer

attachment

Rx1nyDxyz · Answer

OHH, then it wouldn't, because you're still averaging the numbers!

crispyrat · Answer

yezyez so we can cross out that answer and be left with which one?

Rx1nyDxyz · Answer

one of the "yes answers"..i think it's the last one?

crispyrat · Answer

no rember we just crossed variabilty out,

Rx1nyDxyz · Answer

oh i forgot that oops..so it's the 3rd one!

crispyrat · Answer

Good Job :))))

Rx1nyDxyz · Answer

Ah, thank you! Can i ask one more?

crispyrat · Answer

sure but u should make a seprate post :)

Rx1nyDxyz · Answer

Alr i will and tag u

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