The average zinc concentration recovered from a sample of measurements taken in 36 different locations in a found to be 2.6 grams per milliliter. Assume that the population standard deviation is 0.5 gram per milliliter. At 90\96 confidence interval level for the mean zinc concentration in the river, how large a sample is required that estimate of p differs from µ by less than 0.04? a) 36 b) 257 C) 423 d) 21 e) 11431 Teave blank

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2-
The average zinc concentration recovered from a sample of measurements taken in 36 different locations in a river is
found to be 2.6 grams per milliliter. Assume that the population standard deviation is 0.5 gram per milliliter. At the
90\96 confidence interval level for the mean zinc concentration in the river, how large a sample is required that our
estimate of u differs fromu by less than 0.04?
a)
36
b)
257
C)
423
d)
21
e)
11431
Leave blank
Transcribed Image Text:2- The average zinc concentration recovered from a sample of measurements taken in 36 different locations in a river is found to be 2.6 grams per milliliter. Assume that the population standard deviation is 0.5 gram per milliliter. At the 90\96 confidence interval level for the mean zinc concentration in the river, how large a sample is required that our estimate of u differs fromu by less than 0.04? a) 36 b) 257 C) 423 d) 21 e) 11431 Leave blank
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