5. 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 26.30 26.43 26.28 26.19 26.49 Bottom 26.22 26.32 26.20 26.11 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 nommal test for differences in means?

5. 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 26.30 26.43 26.28 26.19 26.49 Bottom 26.22 26.32 26.20 26.11 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 nommal test for differences in means?

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter12: Subsurface Exploration

Section: Chapter Questions

Problem 12.9P

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