To investigate whether a power plant is within regulation of water temperature,

Question

To investigate whether a power plant is within regulation of water temperature, 50 water samples are taken at randomly selected tomes from a drainage pipe that leads to a river. The water produced from the plant is used for cooling and should be less than 150 degress F. The sample yields a sample mean 157 degress and sample sd of 14.5 degrees. Which procedure should be used in order to test whether the power plant is within regulation temperature?

matched paired t test

one sample t test for mean

linear regression analysis

one sample z-test for proportions

one sample z test for mean

Explanation / Answer

Here we have to check whether the water produced from the plant is used for cooling and should be less than 150 degrees F or not.

And we have given sample mean and sample standard deviation.

We don't know population standard deviation so testing the given claim we use one sample t-test for mean.

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