Unit 1 Practice

Front

What is the interquartile range (IQR)?

Back

The interquartile range (IQR) is a measure of statistical dispersion, representing the range of the middle 50% of a dataset. It is calculated as the difference between the third quartile (Q3) and the first quartile (Q1).

Front

What is a good statistical question?

Back

A good statistical question is one that anticipates variability in the data and can be answered by collecting data. For example, 'How many hours of sleep do you usually get on a school night?' is a good statistical question.

Front

What does it mean if a data distribution is skewed left?

Back

A left-skewed distribution (or negatively skewed) has a longer tail on the left side. This means that most of the data points are concentrated on the right, with fewer low values.

Front

What is the median in a dataset?

Back

The median is the middle value of a dataset when it is ordered from least to greatest. If there is an even number of observations, the median is the average of the two middle numbers.

Front

What is an outlier?

Back

An outlier is a data point that differs significantly from other observations in a dataset. Outliers can skew the results of statistical analyses.

Front

What is the mean of a dataset?

Back

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

Front

What is a dot plot?

Back

A dot plot is a simple statistical chart that consists of dots representing the frequency of data points. Each dot represents one observation.

Front

What is the mode in a dataset?

Back

The mode is the value that appears most frequently in a dataset. A dataset may have one mode, more than one mode, or no mode at all.

Front

How do you determine the most appropriate measure of central tendency?

Back

To determine the most appropriate measure of central tendency (mean, median, or mode), consider the data's distribution and the presence of outliers.

Front

What is a tally table?

Back

A tally table is a method of recording and counting data using tallies. Each group of five tallies is represented by four vertical lines and a diagonal line.