Question: The equation for a confidence interval is a) Which variable in this equation changes between a 90% confidence interval and 95% confidence interval? Justify your

The equation for a confidence interval is

a) Which variable in this equation changes between a 90% confidence interval and 95% confidence interval? Justify your answer. The k will change between confidence intervals, this is because the value of the cumulative probability will be 0.95 for a 90% CI and 0.975 for a 95% CI and a higher cumulative probability will result in a larger k value.

How to get the cumulative probability number of 0.95 and 0.975 for 90%CI and 95% CI respectively.

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