Statistics 7.1-7.3 Review

Find the interquartile range and population standard deviation for the data set.

Find the median, mean, and interquartile range for each data set.

A contestant in a singing competition receives scores of 8.8, 8.5, 9.8, and 9.3 from four judges. If she needs a 9.0 or higher to advance, what is the lowest score she can receive from the fifth and final judge to advance?

• 8.2

• 8.5

• 8.6

• 10

A student counted the number of days she missed school each month of the school year. Below are the number of absences for the 11 months, August through June (rearranged from least to most):

0, 0, 0, 1, 1, 2, 2, 2, 3, 3, 6

What is the mode?

• There is no mode

• 0

• 1

• 0 and 2

Population or Sample?

A quality control engineer is curious about the thickness of paint on a car at her factory. She randomly selects 30 points on the car and measures the paint thickness at each of those points.

• Population

• Sample

What would be the population in this example?
Surveyors in a mall choose shoppers to ask about products they prefer.

• the surveyors
• all shoppers in the mall
• the shoppers who were asked their preferences

What would be the sample in this example?
Surveyors in a mall choose shoppers to ask about products they prefer.

• the surveyors
• all shoppers in the mall
• the shoppers who were asked their preferences

Sour Patch Kids candy usually tastes sour, then sweet.

• Qualitative

• Quantitative

Orca whales can weigh up to 22,000 lbs!

• Qualitative

• Quantitative

Identify each of the following as an observational study or an experiment.

Compare the grades on a final math test of 25 students who use calculators and 25 students who do not use calculators. The students decide which group they are in.

• Observational Study

• Experiment