Units 1 and 2 Review

Concerned with collecting, organizing, summarizing, and presenting data.

• data

• statistics

• descriptive statistics

• inferential statistics

Has to do with making generalizations about the drawing conclusions from the data collected.

• data

• statistics

• descriptive statistics

• inferential statistics

The set of all people or objects whose properties are to be described and analyzed by the data collector.

• population

• sample

• random sample

• representative sample

A subset or subgroup of the population.

• population

• sample

• random sample

• representative sample

Four groups of randomly selected people are assigned a different diet. After six months, the blood pressures of each group are compared.

• Observational Study

• Experiment

To test the effects of breakfast on grades I ask my students if they ate breakfast and then compare the breakfast eaters grades to the non-breakfast eaters.

This is an example of:

• Observational study

• Experiment

The most important advantage of experiments over observational studies is that

• A) experiments are usually easier to carry out
• B)Experiments can usually give better evidence of causation
• C) Confounding cannot happen in experiments
• D) Observational studies cannot use random samples

In order to perform an experiment using 60 members of a gym, I first divide the list of members into men and women because I feel that the results will be different based on gender. I then randomly choose 30 men and 30 women. I assign half of the men to the treatment group and half to the control group. I repeat this procedure with the women. This is an example of a:

• randomized comparative design
• blocking design
• matched pairs design
• double blind simple random sample

The dotplots compare the number of hours a group of teenagers spent on two activities.

Select the answer that is NOT true.

• The data for exercise has a lower center than the data for video games.

• Both dotplots appear to be skewed right.

• Both dotplots appear to have outliers.

• The time spent on video games had a greater range than the time spent on exercise.

What is the shape of this distribution?

• fairly symmetric

• Skewed Left

• Skewed Right

• Uniform