12. (08.03 HC)
Minnie wants to know if the number of words on a page in her planetary science 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.
Planetary science:
mean: 48.9
median: 41
MAD: 9.2
Math:
mean: 34.5
median: 44
MAD: 1.9
She claims that because the mean number of words on each page in the planetary science book is greater than the mean number of words on each page in the math book, the planetary science book has more words per page. Based on the data, is this a valid inference? (5 points)
• No, because there is a lot of variability in the planetarylegience book data.
Yes, because there is a lot of variability in the planetary science book data.
• Yes, because the mean is larger in the planetary science book.
• No, because the mean is larger in the planetary science book.
3 answers
1: all students in each grade
2: no, it is not a valid inference because his classmates do not make up a random sample of the students in the school
3: it is not a valid sample because it is not a random sample of the population
4: more members prefer a cruise vacation and a ski vacation than a beach vacation
5: hamburgers and pizza are preferred almost equally
6: 208
7: team A
8: the range of round 1 is greater than the round 2 range.
9: 2.0
10: group A, because seven children have a forearm length longer than 10 inches
11: online customers buy an average of 4 packs compared with walk-in customers, who buy an average of 2 packs
12: no, because there is a lot of variability in the planetary science book data
100%! hope this helps anyone who needs to take it!
1 answer