Describing Data Review

Which equation best represents the line of best fit for the scatterplot?

• y = x + 6

• y = 2x + 6

• y = -x + 6

• y = -2x + 6

Jeffrey surveys the 13 girls and 13 boys in his class to find out how many pairs of shoes they have in their closets. Which statement is true?

• The value of Q3 for the boys is greater than the value of Q3 for the girls

• The mean number of shoes for the boys is greater than the mean number of shoes for the girls.

• The median number of shoes for the girls is greater than the median number of shoes for the boys

• The median number of shoes for the boys is greater than the median number of shoes for the girls.

The weather service recorded some temperatures in Baltimore and Seattle throughout the month of October. Which statement is TRUE when comparing the interquartile range (IQR) of the cities?

• The amount of spread in the middle-half of Baltimore's data is greater than Seattle's.

• The amount of spread in the middle-half of Seattle's data is greater than Baltimore's.

• The amount of spread in the middle-half of both cities is exactly the same

• A typical day's temperature in both cities is about 27° Celsius.

Which statement is TRUE?

• A correlation does not establish a causal relationship.

• A positive correlation always establishes a causal relationship.

• A negative correlation always establishes a causal relationship.

• A negative correlation always establishes a causal relationship.

Which Class has the highest frequency?

• 2.5-3.0

• 0.5-4.0

• 2.5-3.5

• 3.0-3.5

Which statement is true?

• The freshman class has A LESSER MEAN number of cans donated than the sophomore class.

• The freshman class has THE SAME MEDIAN number of cans donated than the sophomore class.

• The freshman class has A GREATER MEAN number of cans donated than the sophomore class.

• The freshman class has A GREATER MEDIAN number of cans donated than the sophomore class.

Answer explanation

The "MIDDLE" for the freshman class is further to the left, so the freshman MEDIAN IS LESS than the sophomore median.

Which statement is true?

• The freshman class has LESSER MEAN number of cans donated than the sophomore class.

• The freshman class has THE SAME MEDIAN number of cans donated than the sophomore class.

• The freshman class has GREATER MEAN number of cans donated than the sophomore class.

• The freshman class has GREATER MEDIAN number of cans donated than the sophomore class.

Answer explanation

The "MIDDLE" for the freshman class is further to the left, so the freshman MEDIAN IS LESS than the sophomore median.

How would you describe this distribution?

• Left skewed

• Uniform

• Right Skewed

• Symmetrical

The table represents the responses received when high school students were asked about their job status. Given that a randomly selected student is a girl, what is the conditional relative frequency that she has an after-school job?

• 0.11

• 0.89

• 0.25

• 11

The scatterplot for a set of data points is shown, along with the line of best fit. Choose the BEST estimate for r, the correlation coefficient.

• -1

• 1

• -0.85

• 0.85