Mathematics, 26.04.2021 16:00, mikeydog5291
Most water treatment facilities monitor the quality of their drinking water on hourly basis. One variable monitored it is pH, which measures the degree of alkalinity or acidity in the water. A pH below 7.0 is acidic, one above 7.0 is alkaline, and a pH of 7.0 is neutral. One water treatment plant has a target pH of 8.5 (most try to maintain a slightly alkaline level). The mean and standard deviation of 1 hour's test results, based on 12 water samples at this plant are: Mean =8.24 S=.16 Does this sample provide sufficient evidence that the mean pH level in the water differs from 8.5?
Answers: 2
Mathematics, 22.06.2019 03:00, foziasif9525
Gia opened two savings accounts at two different banks. one account earns an annual 3.4% simple interest, and the other earns half as much. if she deposited $500 in each account, how much total interest will she have earned in 5 years? a. $34.00 b. $25.50 c. $51.00 d. $510.00
Answers: 1
Mathematics, 22.06.2019 05:30, emmalucilleblaha1995
Let f(x) = x + 2 and g(x) = x2 + 4. find f(g(f(
Answers: 2
Mathematics, 22.06.2019 06:00, hihudgins902
Students are getting signatures for a petition to increase sports activities at the community center. the number of signatures they get each day is 3 times as many as the day before. the expression 3^6 represents the number of signatures they got on the sixth day. how many signatures did they get on the first day?
Answers: 1
Most water treatment facilities monitor the quality of their drinking water on hourly basis. One var...
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