Use the Following Data for the Next Questions

question 7

Essay

Use the following data for the next questions. Biologists, researching the effects
of adding limestone sand as buffer for acid rain effects in streams, monitored the
pH levels of two streams each month for 36 months. The first stream had a mean
pH level of 6.8 with a standard deviation of 2.3. The control stream had a mean pH
level of 9.2 with a standard deviation of 1.5. Assume a .05 significance level for
testing the claim that the mean pH of the first stream was less (more acidic) than
the mean pH of the control stream. Also, assume the two samples are independent
simple random samples selected from normally distributed populations.
-Use a .05 significance level and the traditional or P-value method for hypothesis testing the claim that the pH level in the first stream has a standard deviation different from that in the second stream. State a conclusion about the null hypothesis and a final conclusion that addresses the original claim.

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Definitions:

Main Disconnect Switch

A safety device used to completely disconnect electrical power to a machine, system, or area for maintenance or emergency purposes.

Incoming Power Lines

Electrical lines that supply power from an external source to a building, machine, or device.

Jump-To-Subroutine Instruction

A programming instruction that causes the execution flow to jump to a specific subroutine or function, and returns once the subroutine is completed.