Question

I promise a FAN AND A MEDAL!!!!!!
Sarah is testing different types of planting soil to determine which type is most effective in growing blueberry bushes. She purchases two different brands of planting soil from a local store. Sarah applies Brand A to 1 area of the yard and Brand B to another area of the yard, both of which receive full sunlight. She waters the area with Brand B daily; she waters the area with Brand A every other day. At the end of the study, Sarah concludes Brand B is more effective in growing blueberry bushes. Why is her conclusion not valid

Answer 1

what are the options?

Answer 2

it says that she watered the brand B plant every single day while she only watered the brand A plant every other day - if she wants to compare how Brand A and Brand B are different, she needs to give each plant the same amount of water

(this process is called "controlling for variables")

Answer 3

so her conclusion is not valid because she needs to give each plant the same amount of water

Answer 4

yeah, pretty much

Answer 5

can you help me with another question

Answer 6

sure

Answer 7

Julia enjoys shooting paper balls into the wastebasket across her office. She misses the first shot 50% of the time. When she misses on the first shot, she misses the second shot 20% of the time. What is the probability of missing two shots in a row

Answer 8

probability of missing two shots = (probability of missing first shot)*(probability of missing second shot) = (0.5)*0.2

Answer 9

0.1 or 10%

Answer 10

excellent, good job

Answer 11

169 is the square of 13