Suppose that the data you collected were about how many hours a student prepared for a math test (x) and what score out of 10 they obtained for that test (y). provide an interval estimate for a student who prepared 12 hours for the test.
a. (4.50 , 6.50)
b. (6.50 , 7.10)
c. (3.30 , 10.91)
d. (5.65 , 8.57)

step-by-step explanation:

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)