Question

A limnologist wishes to estimate the mean phosphate content per unit volume of lake water. It is

known from studies in previous years that the standard deviation has a fairly stable value of s4.How many

water samples must the limnologist analyze to be 90% certain that the error of estimation does not

exceed 0.8 milligrams?​

Answer 1

Answer:

The calculated value of the number of water samples that need to be analyzed is 68.

Given:

Standard deviation =

=σ=4=σ= 4

•m = Margin o

Answer 2

Answer:

answer is 68

Step-by-step explanation:

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