AP Stats Chapter 1 Review

The cumulative relative frequency graph below describes the distribution of weights (in grams) of tomatoes grown in a laboratory experiment. Which of the following weights is closest to the median of the distribution?

• 120 gm

• 140 gm

• 160 gm

• 170 gm

Fuji apples grown at a certain orchard have a mean weight of 5.2 ounces with a standard deviation of 0.8 ounces. Suppose the scale the orchard owner uses systematically underweighs apples by 0.2 ounces and also weighs the apples in grams, rather than ounces. What would the mean and standard deviation of these apples’ weights be as determined by this scale? (Note: 1 ounce ≈ 28 grams).

• Mean 145.6 grams, standard deviation 22.4 grams.

• Mean 140 grams, standard deviation 22.4 grams.

• Mean 140 grams, standard deviation 16.8 grams.

The dot plot shows the voter turnout (as a percentage of voting-age population) for the 50 states—plus the District of Columbia—in a recent presidential election. Approximately what percentage had a turnout above 65%?

• 27.5%

• 17.6%

• 18%

The graphical presentation of information from the World Bank about the percentage of land in four East African countries that is forest is displayed as a pictogram. What’s wrong with this method of presenting information?

• The vertical scale underrepresents differences between countries.

• “Percentage of land area” does not take into account differences on total area among these countries.

• The graph doesn't have a title.

• Using proportionally-sized trees exaggerates differences between countries.

Suppose we classify 315 randomly selected college students according to their general major field and their self-described political viewpoint. The table presents the results. What percentage of all students surveyed are conservatives majoring in business?

• 12.1%

• 42.2%

• 28.6%