## anonymous one year ago 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

1. exoticinspirit

what do you think?

2. anonymous

Freezer

3. anonymous

@ExoticInspirit Do u know this?

4. exoticinspirit

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

5. exoticinspirit

think*

6. anonymous

Now you tell me once I finished and got it wrong

7. exoticinspirit

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

8. anonymous

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.

9. exoticinspirit

but you know the right answer now right :D

10. Photon336

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.

11. anonymous

Can you solve this one @ExoticInspirit

12. Photon336

The treatment is sugar

13. exoticinspirit

yeah one sec

14. exoticinspirit

if its the same wouldnt it be the second choice

15. exoticinspirit

@acxbox22 @asmagul

16. exoticinspirit

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

17. exoticinspirit

because i've never done this kind of problem yet

18. exoticinspirit

whaqt are the answer choices i think i got it