(answer + brainliest answer) hydrologists collected water samples from a river for several years. they found 62 out of 648 samples exceeded the desired ph levels, with a 2% samples exceeded the desired ph levels, with a 90% confidence level. which of the following is the most reasonable conclusion? a. it is likely that the river water exceeds the desired ph level between 8% and 12% of the time studied. b. it is likely that the river water exceeds the desired ph level between 10% and 12% of the time studied. c. it is likely that the river water exceeds the desired ph level between 13% and 15% of the time studied. d. it is likely that the river water exceeds the desired ph level between 11% and 15% of the time studied.

Option A is right

Step-by-step explanation:

Given that hydrologists collected water samples from a river for several years. They found 62 out of 648 samples exceeded the desired pH levels, with a 2% samples exceeded the desired pH levels, with a 90% confidence level.

Here margin of error = 2%

Proportion sample = 62/648 =9.5

Hence confidence interval = (9.5-2, 9.5+2)

After rounding off this becomes (8,12)

A. It is likely that the river water exceeds the desired pH level between 8% and 12% of the time studied.

is right.

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step-by-step explanation:

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