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The level of pesticides found in the blubber of whales is a measure of pollution of...

The level of pesticides found in the blubber of whales is a measure of pollution of the oceans by runoff from land and can also be used to identify different populations of whales. A sample of six male minke whales in the West Greenland area of the North Atlantic found the mean concentration of the insecticide dieldrin to be x = 356 nanograms per gram of blubber (ng/g). Suppose that the concentration in all such whales varies Normally with population standard deviation σ = 54 ng/g. Give a 95% confidence interval for estimating the mean level. (Round your answers to two decimal places.)

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Expert Solution

Solution :

Given that,

= 356

= 54

n = 6

At 95% confidence level the z is ,

  = 1 - 95% = 1 - 0.95 = 0.05

/ 2 = 0.05 / 2 = 0.025

Z/2 = Z0.025 = 1.960

Margin of error = E = Z/2* (/n)

= 1.960 * ( 54 / 6 )

= 43.21

At 95% confidence interval estimate of the population mean is,

- E < < + E

356 - 43.21< < 356 + 43.21

312.79 < < 399.21

(312.79 ,399.21):

milcah answered 4 months ago
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