Question

Riley is testing how quickly sugar water freezes. He adds sugar water to one ice tray and plain water to another ice tray. He places each tray in the freezer and records the time when each one starts to freeze. What is the treatment in this experiment?

Water
Freezer
Ice tray
Sugar

Answer 1

what do you think?

Answer 2

Freezer

Answer 3

@ExoticInspirit Do u know this?

Answer 4

oh sorry i thin the treatment is sugar because the control group would be water

Answer 5

think*

Answer 6

Now you tell me once I finished and got it wrong

Answer 7

oh sorry didn't know you were doing a test or something my bad..

Answer 8

ok what about this one
n a sample of 200 households, the mean number of hours spent on social networking sites during the month of January was 55 hours. In a much larger study, the standard deviation was determined to be 7 hours. Assume the population standard deviation is the same. What is the 99% confidence interval for the mean hours devoted to social networking in January?

The 99% confidence interval ranges from 53.73 to 56.27 hours.
The 99% confidence interval ranges from 7 to 55 hours.
The 99% confidence interval ranges from 54.51 to 55.49.
The 99% confidence interval ranges from 55 to 60 hours.

Answer 9

but you know the right answer now right :D

Answer 10

FYI If you dissolve any solute in water that would lower the freezing point so the time it takes the sugar/water to freeze will be longer than the regular water b/c this is the concept of collagative properties which depend on the amount of solute you dissolve in a solvent.

Answer 11

Can you solve this one @ExoticInspirit

Answer 12

The treatment is sugar

Answer 13

yeah one sec

Answer 14

if its the same wouldnt it be the second choice

Answer 15

@acxbox22 @asmagul

Answer 16

i dont know but is there an equation to find the confidence interval

Answer 17

because i've never done this kind of problem yet

Answer 18

whaqt are the answer choices i think i got it