Statistics and Sampling

_________ is a sample in which each individual or object in the entire population has an equal chance of being selected.

• Sample

• Population

• Random Sample

• Biased Sample

Mrs. Cathy wants to know how many students at Cedar Bluff enjoy solving math word problems. What is the best sampling method?

• ask for 20 volunteers to discuss whether they enjoy solving math word problems

• ask the last 20 people to arrive at CB this morning

• Randomly ask 2 students in the hallway by Mr. B's room

• Ask every 20th student that walks into school

A newspaper randomly chooses 100 names from its subscriber list and then surveys those subscribers to find out if they read the sports section. This sample is ........

• unbiased

• biased

Coach Mullins surveys the students sitting in the back of her room by her desk. This can best be described as......

• Biased sample

• Random sample

• Convenience sample

The counselor surveyed all the eighth graders, 7th graders and one second grader about their favorite subject in school. Which group is an outlier?

• 8th graders

• 7th graders

• 2nd grader

What is the outlier of this group of data taken from a survey

• 94

• 92

• 42

• 87

The entire group of objects or individuals considered for a survey is called a _________________________

• outlier

• population

• sample

A value much greater or much less than the others in a data set is called an __________________________. A piece of data that doesn't belong.

• sample

• outlier

• population

What do the box plots tell you about the growth of a typical plant species?

• B typically grows taller than A since the range for B is greater.

• B typically grows taller than A since the IQR for B is greater.

• A grows taller than B since the median for A is greater.

• A typically grows taller than B since the mean for A is greater.

What do the box plots tell you about the variability of the data?

• B has greater variability because its range and IQR are greater than A.

• B has greater variability because its median & mean are greater than A.

• A has greater variability because its range & IQR are greater than B.

• A has greater variability because its median and mean are greater than B.