Arecent study was conducted to determine the curing efficiency (time to harden) of dental composites (resins for the restoration of damaged teeth) using two different types of lights. independent random samples of lights were obtained and a certain composite was cured for 40 seconds. the depth of each cure (in mm) was measured using a penetrometer. the summary statistics for the halogen light were n_1 = 10, x_1 = 5.35, and s_1 = 0.7. the summary statistics for the luxomax light were n_2 = 10, x_2 = 3.90, and s_2 = 0.8. assume the underlying populations are normal, with equal variances. a. the maker of the halogen light claims that they produce a larger cure depth after 40 seconds than luxomax lights. is there any evidence to support this claim? use alpha = 0.01. b. construct a 99% confidence interval for the difference in population mean cure depths.
answer: i'm going in
a. this is the arithmetic sequence, because
the first term of this sequence is and the difference is 0.3.
b. since this is not arithmetic sequence.
c. since this is not arithmetic sequence.
d. since this is not arithmetic sequence.
1) x=14 and y=-3
to solve the system of equations, substitute x = -3y+5 into the equation 2x + 8y = 4 for x. this becomes 2(-3y+5) +8y = 4. to solve, apply the distributive property, combine like terms and isolate y.
then to find x, substitute y =-3 into x =-3y+5.
x = -3(-3) + 5
x = 9 + 5
x = 14
i think the answer is 500 people i'm not sure though i hope this
you divide 210 by 42% and i got 500