Prob & Stats Semester 1 Review ch 1-5

Front

What is the difference between qualitative and quantitative data?

Back

Qualitative data describes characteristics or qualities (e.g., favorite food), while quantitative data represents numerical values or counts (e.g., number of wins).

Front

What type of data is represented by the number of wins for a volleyball team?

Back

Quantitative data.

Front

What type of data is represented by the favorite food of a senior class?

Back

Qualitative data.

Front

How do you calculate the class width in a frequency distribution?

Back

Class width is calculated by subtracting the lower boundary of a class from the lower boundary of the next class.

Front

If the class intervals are 10-20, 21-30, and 31-40, what is the class width?

Back

The class width is 11 (21 - 10 = 11).

Front

What is the mean in a normal distribution?

Back

The mean is the average value around which the data is distributed.

Front

In a normal distribution with a mean of 12 days and a standard deviation of 3 days, what percent of products last 6 days or less?

Back

Approximately 2.3%.

Front

Back

Front

What is standard deviation?

Back

Standard deviation is a measure of the amount of variation or dispersion in a set of values.

Front

What is the empirical rule in statistics?

Back

The empirical rule states that for a normal distribution, about 68% of data falls within one standard deviation of the mean, 95% within two, and 99.7% within three.