A study finds that patients who use a powered toothbrush have a mean plaque-score reduction of 2.4 points, with a 95% confidence interval of 1.8 to 3.0 points. Which interpretation is most appropriate?  

In countries like the U.S. and France, most wildfires are caused by which of the following?

As we discussed in class, which of the following states has nationally significant fire research and training institutions, it is one of the nation’s leading users of prescribed fire?

Researchers test whether a new medication lowers blood pressure more effectively than the standard medication. In reality, the two medications are equally effective. Which conclusions would represent a Type I error? (Select all that apply.)  

In a normal distribution, 95.4% of the data fall within two standard deviations of the mean. What percentage of the data fall more than two standard deviations above the mean?

If you were assessing the fuel load of a landscape for fire risk, which of the following would represent ideal fuel conditions for high fire risk?

A dental hygienist investigates whether a new powered toothbrush reduces plaque more effectively than a manual toothbrush. Participants are assigned to use either the powered or manual toothbrush. Plaque scores are measured at baseline and again after four weeks. Which statements correctly describe the comparisons in this study? (Select all that apply.)  

A clinical risk assessment classifies patients as low, moderate, or high risk. What type of variable is this?

The owner of a large retail bakery wants all of the bread loaves to be the same.  She has the staff measure all the  loaves baked in one day and records the measurements and creates a distribution.  What statistical figure could she look at to see how widely the loaves vary? (check all that apply)

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