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Differences in Water Samples from the Same River

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What reasons could there be for different water sample results at four sites along a river?

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In your data on water samples there are a number of parameters that have an effect on the quality of water used for human consumption. The pollution boards operated by various levels of governments monitor regularly the environment as a whole. When a river goes downstream it comes across with a number of activities which are both natural and man-made. For example if the river is passing through an area which is abundant in radioactive materials it will carry with it the useful and (also toxic) chemicals which have effect on the population living ...

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Solution explains reasons for water samples being different at different areas of the same river in 385 words.

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A) Does the data suggest that watering raises the true yield by more than 50g/plant? b) Test the hypothesis that the paint does not make any real difference. c) Does this data suggest that the true mean alkalinity is higher downstream than upstream?

3 a)     In an experiment to determine the effects of drought conditions on a certain variety of potato, the following data on crop yield (g/plant) was obtained:

TREATMENT SAMPLE SIZE MEAN YIELD STANDARD DEVIATION
WATERED 6 376 78.4
UNWATERED 12 234 65.8

Does the data suggest that watering raises the true yield by more than 50g/plant?
b)     Ten wooden panels were painted partly with an ordinary paint and partly with a flame-resistant paint. The times, in suitable units, taken to burn through the panels are tabulated below:

PANEL A B C D E F G H I J
Ordinary Paint 12 10 8 20 6 13 7 9 25 15
Flame Resistant Paint 17 16 15 22 13 220 13 18 24 18

Test the hypothesis that the paint does not make any real difference.

c) Research suggests that the discharge of industrial waste into rivers affects water quality. To assess the effect of a particular power plant on water quality, 48 water specimens were taken, half 16km upstream and half 4km downstream of the plant. Alkalinity (mg/l) was determined for each specimen and the results are tabulated below.

LOCATION MEAN STANDARD DEVIATION
UPSTREAM 75.9 1.83
DOWNSTREAM 183.6 1.70

Does this data suggest that the true mean alkalinity is higher downstream than upstream?

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