Maximum Contaminant Levels (MCLs) are regulations on water quality set by the United States Environmental Protection Agency. Researchers measured the Chloramines MCLs (in mg/L) of water samples from random locations of each of two wells. The data are given below. Sample sizeSample meanSample sdWell A153.7 0.3Well B193.40.6Assume normal populations with equal variance and construct a 95% confidence interval for the difference in mean MCLs levels. Find the upper bound of the confidence interval (round off to second decimal place).

180

step-by-step explanation:

85.560%

step-by-step explanation:

conditional probability is defined as:

p(a|b) = p(a∩b) / p(b)

in other words, the probability that a occurs, given that b has occurred = the probability that both a and b occur / the probability that b occurs.

in this example:

p(turns 64 | turns 44) = p(turns 64 & turns 44) / p(turns 44).

if someone turns 64, they must have already turned 44, so:

p(turns 64 | turns 44) = p(turns 64) / p(turns 44)

on page 42, we see that of the original 100,000, 94944 turn 44, and 81234 turn 64.   therefore:

p(turns 64 | turns 44) = 81234 / 94944

p(turns 64 | turns 44) = 0.85560

a

step-by-step explanation: