OST Statistics and Probability Review

Which histogram represents the times from Team R in the obstacle course?

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Approximately what percent of males surveyed get their information from TV news?

• 13%

• 20%

• 32%

• 40%

Which conclusion about the relationship between the two variables in the scatter plot is most likely true?

• Increased rainfall is strongly correlated with an increase in crop yield

• Increased rainfall is not correlated with an increase in crop yield

• Decreased rainfall is strongly correlated with an increase in crop yield

• Decreased rainfall is weakly correlated with an increase in crop yield

What is the correlation coefficient for the data and its interpretation?

• The correlation coefficient of r = 0.717 indicates a fairly strong positive linear association between the test grades and the students' study time.

• The correlation coefficient of r = 0.515 indicates the fraction of the variation in the students' study times that can be accounted for by their test grades.

• The correlation coefficient of r = 0.717 indicates a fairly strong negative linear association between the test grades and the students' study time.

• The correlation coefficient of r = 0.515 indicates the fraction of the variation in test grades that can be accounted for by the students' study times.

Suppose that a person's age was left out by mistake. If this person was significantly younger than 15, select the appropriate statement that describes the effect of including the value in the data set.

• The median and mean will both decrease and the data will skew to the left

• The median will remain the same, the mean will increase and the data will skew right.

• The median and mean will both increase in value and the data set is bimodal

• The median will remain the same, the mean will decrease and the data will skew left

For an eruption that lasts 3.5 minutes, about how long would the wait time be for the next eruption?

• 85 minutes

• 70 minutes

• 78-83 minutes

• 0-85 minutes

Suppose that a person's age was left out by mistake. If this person was significantly younger than 15, select the appropriate statement that describes the effect of including the value in the data set.

• The median and mean will both decrease and the data will skew to the left

• The median will remain the same, the mean will increase and the data will skew right.

• The median and mean will both increase in value and the data set is bimodal

• The median will remain the same, the mean will decrease and the data will skew left

Which of the following dot plots represents the distribution of the babies' weight that week.

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Which conclusion can be best supported by the histograms?

• As boys get older, shoe sizes increase and the distribution remains relatively unchanged

• As boys get older, shoe size range, defined by the minimum and maximum decreases

• As boys get older, shoe sizes become normally distributed with fewer large outliers

• As boys get older, shoe size distribution become more spread with more large outliers.

The variable x represents time, in years, and y represents the price of crude oil per barrel in dollars. According to the scatter plot, which equation BEST represents the relationship between the year and the price of crude oil?

• y = 0.10x - 1.9

• y = 11.2x + 16.1

• y = 0.9x +18.4

• y = 9.4x + 15