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Celsius and standard deviation

In a chemical experiment, a solution is to be kept at 70 degrees Celsius. At a randomly selected time, the actual temperature is a normal random variable with mean 70 degrees Celsius and standard deviation 0.4 degrees Celsius.

A) The middle 95% of time the temperature is between __ and __ ?

B) What is the 10th percentile?

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## Q : Examine the relationship between two variables

Give an example of how you may use a correlation or simple regression to examine the relationship between two variables in your area of interest. State the null and alternative hypothesis and clearly define your variables.