PRETEST Statistics and Sampling Concepts

Front

What is the mean of a data set?

Back

The mean is the average of a set of numbers, calculated by adding all the values together and dividing by the number of values.

Front

What happens to the mean when the lowest score is removed?

Back

Removing the lowest score typically increases the mean of the remaining scores.

Front

What is a representative sample?

Back

A representative sample accurately reflects the characteristics of the larger population from which it is drawn.

Front

What is the interquartile range (IQR)?

Back

The interquartile range is the difference between the first quartile (Q1) and the third quartile (Q3) in a data set, representing the middle 50% of the data.

Front

How do you calculate the interquartile range?

Back

To calculate the IQR, first find Q1 (25th percentile) and Q3 (75th percentile), then subtract Q1 from Q3 (IQR = Q3 - Q1).

Front

What is data in the context of experiments?

Back

Data refers to the information collected from experiments, which can be organized into charts and graphs.

Front

What is a biased sample?

Back

A biased sample is one that does not accurately represent the population, often due to the method of selection.

Front

What is a random sample?

Back

A random sample is one where every member of the population has an equal chance of being selected.

Front

What is the purpose of using samples in statistics?

Back

Samples are used to make inferences about a larger population without having to collect data from every individual.

Front

What is the difference between qualitative and quantitative data?

Back

Qualitative data describes characteristics or qualities, while quantitative data consists of numerical values that can be measured.