Question: When would I use a standard error instead of a standard deviation? Write the two formulas for calculating standard error. (Hint: There is one for

  1. When would I use a standard error instead of a standard deviation?

  1. Write the two formulas for calculating standard error. (Hint: There is one for means and one for proportions)

  1. If I wanted to know if there was a difference between the mean response in Group A and the mean response in Group B, would I use a one-tailed test or a two-tailed test?

  1. If I wanted to know if the mean response in Group A was lower than the mean response in Group B, would I use a one-tailed test or a two-tailed test?

  1. After calculating my standard error, I decide that I want to double the size of my sample. Will my standard error increase, decrease, or stay the same? (Hint: Look at the denominator of the SE equation)

  1. What is the range of values that a correlation coefficient can take and what does the correlation coefficient tell us about our data?

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