Statistics Unit Review

What do we call probability sampling method in which sample members from a larger population are selected according to a random starting point but with a fixed, periodic interval?

• Cluster Sampling

• Convenience Sampling

• Stratified Sampling

• Systematic Sampling

What do we call a sample that is drawn from a number of separate strata of the population, rather than at random from the whole population, in order that it should be representative?

• Systematic Sample

• Stratified Sample

• Simple Random Sample

• Convenience Sample

What type of sampling occurs when researchers divide a population into smaller groups, then randomly select among these groups to form a sample?

• Cluster Sampling

• Simple Random Sampling

• Convenience Sampling

• Systematic Sampling

True or False:

All samples lead to a good prediction about the entire population.

• True

• False

A school principal wants to see which subject the 695 students in his school liked best. Which choice BEST represents a representative sample?

• All girls in the school

• All students who have an A in Social Studies

• All students who are failing science

• 1 class from each grade level

To find out what sort of events they should plan, the student government officers at Truth send a survey to 30 students whose names were randomly selected. The sample is...

• The 30 students who were sent the survey

• All students at Truth

• The student government officers

Which is an example of a random sample?

• Polling the first 10 people who enter a room

• Asking a survey question to people who call in

• Drawing 10 names from a hat

_______ is the entire group of objects or individuals considered for a survey.

• Sample

• Quartile

• Random Sample

• Population

True or False: all samples lead to a good prediction about an entire population.

• True

• False

Can pleasant aromas help a student learn better? Two researchers believed that the presence of a floral scent could improve a person's learning ability in certain situations. They had 22 people work through a pencil-and-paper maze 6 times. Three of the times they wore a floral-scented mask and three times they wore an unscented mask. The three trials for each mask followed one another. Testers measures the length of time it took subjects to complete each of the six trials. They reported that, on average, subjects wearing the floral-scented mask completed the maze more quickly that those wearing the unscented mask, although, the difference was not statistically significant. This study is:

• convenience sample

• an oberservational study

• an experiment, but not double-blind

• a double-blind experiment