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Mathematics, 02.07.2020 07:01, Rflaig1129841
4. Trace metals in drinking water affect the flavor, and unusually high concentrations can be haz-
ardous. A study collected water samples from six river locations and measured the concentration
of zinc (in mg/L). Water samples were collected from both the surface water and the bottom
water at each location. Does the data suggest that the true average concentration in the surface
water is different than the concentration in the bottom water? Assume that the zinc concentra-
tions are normally distributed. Using a level of significance of a = 0.05 test the claim that the
concentrations are different. (30 points)
Location
A
C D E F
Zinc on surface
0.411
0.238 0.390 0.410 0.605 0.609
Zinc on bottom 0.430 0.266 0.369 0.531
0.627 0.716
B
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Answers: 3
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Mathematics, 21.06.2019 22:00, cxttiemsp021
Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?
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4. Trace metals in drinking water affect the flavor, and unusually high concentrations can be haz-...
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