Stats Semester Exam

Front

What model do you use to determine the number of trials needed before the first success?

Back

Geometric model.

Front

How many ways can Ashlyn choose 3 pies from 8 available pies?

Back

56 ways.

Front

What is the population and sample in a study of 7 classrooms selected from an elementary school?

Back

Population: all classrooms in the elementary school; Sample: the 7 classrooms selected.

Front

In a phone survey of 75 names from a city phone directory, what is the population and sample?

Back

Population: everyone listed in the city phone directory; Sample: the 75 people selected.

Front

What is the median score of the following test scores: 76, 85, 97, 83?

Back

The median score is 84.

Front

Define 'Population' in statistics.

Back

The entire group of individuals or instances about whom we hope to learn.

Front

Define 'Sample' in statistics.

Back

A subset of the population selected for analysis.

Front

What is the difference between a 'Geometric' and 'Binomial' model?

Back

Geometric model focuses on the number of trials until the first success; Binomial model focuses on the number of successes in a fixed number of trials.

Front

What is the formula for calculating combinations?

Back

C(n, k) = n! / (k!(n-k)!) where n is the total number of items, and k is the number of items to choose.

Front

What does 'Random Sampling' mean?

Back

A sampling method where each member of the population has an equal chance of being selected.