Prob/Stats Final Exam Review Day 1

For which of the following would it be inappropriate to display the data with a single pie chart?

• The distribution of car colors for vehicles purchased in the last month.

• The distribution of unemployment percentages for each of the 50 states.

• The distribution of favorite sport for a sample of 30 middle school students.

• The distribution of shoe type worn by shoppers at a local mall.

• The distribution of presidential candidate preference for voters in a state.

The following bar graph shows the distribution of favorite subject for a sample of 1000 students. What is the most serious problem with the graph?

• The subjects are listed in the correct order.

• This distribution should be displayed with a pie chart.

• The vertical axis should show the percent of students.

• The vertical axis should start at 0 rather than 100.

• The foreign language bar should be broken up by language.

The Dallas Mavericks won the NBA championship in the 2010-2011 season. The two-way table displays the relationship between the outcome of each game in the regular season and whether the Mavericks scored at least 100 points. Which of the following is the best evidence that there is an association between the outcome of a game and whether or not the Mavericks scored at least 100 points?

• The Mavericks won 57 games and lost only 25 games.

• The Mavericks scored at least 100 points in 47 games and fewer than 100 points in only 35 games.

• The Mavericks won 43 games when scoring at least 100 points and only 14 games when scoring fewer than 100 points.

• The Mavericks won a higher proportion of games when scoring at least 100 points (43/47) than when they scored fewer than 100 points (14/35).

• The combination of scoring 100 or more points and winning the game occurred more often (43 times) than any other combination of outcomes.

Here are the amounts of money (cents) in coins carried by 10 students in a statistics class: 50, 35, 0, 46, 86, 0, 5, 47, 23, 65. To make a stemplot of this data, you would use stems:

• 0, 2, 3, 4, 6, 8

• 0, 1, 2, 3, 4, 5, 6, 7, 8

• 0, 3, 5, 6, 7

• 00, 10, 20, 30, 40, 50, 60, 70, 80, 90

• None of these

The histogram shows the heights of 300 randomly selected high school students. Which of the following is the best description of the shape of the distribution of heights?

• Roughly symmetric and single-peaked (unimodal)

• Roughly symmetric and double-peaked (bimodal)

• Roughly symmetric and multi-peaked (multimodal)

• Skewed to the left

• Skewed to the right

You look at ads for houses in Naples, Florida. There are many houses ranging from $200,000 to $500,000 in price. The few houses on the water, however, are priced up to $15 million. The distribution of house prices will be

• skewed to the left.

• roughly symmetric.

• skewed to the right.

• single-peaked.

• approximately uniform.

If a distribution is skewed to the right with no outliers, which expression is correct?

• mean < median

• mean ≈ median

• mean = median

• mean > median

• Can't tell with the given information

The scores on a statistics test had a mean of 81 and a standard deviation of 9. One students was absent on the test day, and his score wasn't included in the calculation. If his score of 84 was added to the distribution of scores, what would happen to the mean and standard deivation?

• Mean will increase, and standard deviation will increase.

• Mean will increase, and standard deviation will decrease.

• Mean will increase, and standard deviation will stay the same.

• Mean will decrease, and standard deviation will increase.

• Mean will decrease, and standard deviation will decrease.

Jorge's score on Exam I in his statistics class was at the 64th percentile of the scores for all students. His score falls

• between the minimum and the first quartile.

• between the first quartile and the median.

• between the median and the third quartile.

• between the third quartile and the maximum.

• at the mean score for all students.

Scores on the ACT college entrance exam follow a bell-shaped distribution with mean 21 and standard deviation 5. Wayne's standardized score on the ACT was -0.6. What was Wayne's actual ACT score?

• 3

• 13

• 16

• 18

• 24