Macy wants to know if the number of words on a page in her grammar book is generally more than the number of words on a page in her math 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.

Question

anonymous · Answer

mean absolute deviation determines how much variability there is

anonymous · Answer

the higher the mean absolute deviation is, the more variability there is

anonymous · Answer

the more variability there is, the less reliable the information is

anonymous · Answer

$$\sigma=\sqrt{\frac{ \sum_{}^{} (x-xbar)^2}{n-1  }}$$

anonymous · Answer

Median	Mean   Absolute Deviation
Grammar	        49.7	         41	           8.4
Math	                34.5	         44	          1.9


She claims that because the mean number of words on each page in the grammar book is greater than the mean number of words on each page in the math book, the grammar book has more words per page. Based on the data, is this a valid

anonymous · Answer

it is not valid, since there is a lot of variability

anonymous · Answer

oh wait wrong formula...thats standard dev

anonymous · Answer

ok thanks!!! sry i took long for that part...i get it now :)