Please help! A researcher wants to test whether listening to classical music before bed has an effect on a
college student's sleep quality. Identify a potential problem, if any, with each experimental
design. Then describe how you can improve it.

Sixty college students volunteer to listen to classical music every night before bed for one month. Sixty
other college students volunteer to not listen to any music before bed for one month. Each person is
evaluated and it is determined that the college students who listened to classical music had improved
sleep quality

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870

just took the test and my answers down below!

step-by-step explanation:

check the pic :

134.6 us dollars

step-by-step explanation:

1 us dollar = 1.33 canadian dollars

so, 150 us dollars = 150 × 1.33 = $199.5.

in canada, the money mitchell spent = 20 canadian dollars.

remaining canadian dollars with him = 199.5 - 20 = 179.5.

after mitchell returned to us, he exchanged the remaining canadian dollars to us dollars.

179.5 canadian dollars = 179.5 × 0.75 = 134.6 us dollars.