Below is a normal distribution with mean 4.9 and standard deviation 1.3.   The shaded area represents values below 6.57.  What is the percentile for 6.57?  That is, what is the probability of the shaded area?

A negative Z-score tells us the observed x value is...

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You are carrying out a hypothesis test, using significance level   You calculate a p-value of 0.0023.  You should:

Which of the following will make a confidence interval wider?  Check all that apply.

This question is included so you get extra credit.  Choose TRUE for 2 points.