Answer to Question #227183 in Chemistry for ayrobi natalie

Question

The homogeneity of the chloride level in a water sample from a lake was tested by

analyzing portions drawn from the top and from near the bottom of the lake, with the

following results in ppm Cl:

Top Bottom

26.30 26.22

26.43 26.32

26.28 26.20

26.19 26.11

26.49 26.42

(a) Apply the t test at the 95% confidence level to determine if the chloride level from

the top of the lake is different from that at the bottom.

(b) Now use the paired t test and determine whether there is a significant difference

between the top and bottom values at the 95% confidence level.

(c) Why is a different conclusion drawn from using the paired t test than from just

pooling the data and using the normal t test for differences in means?

Answer 1

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