Unit 6 Review - Data & Statistics

Front

What is the definition of correlation in statistics?

Back

Correlation refers to a statistical measure that describes the extent to which two variables change together. A positive correlation means that as one variable increases, the other also increases, while a negative correlation means that as one variable increases, the other decreases.

Front

What does IQR stand for in statistics?

Back

IQR stands for Interquartile Range, which is a measure of statistical dispersion. It is calculated as the difference between the third quartile (Q3) and the first quartile (Q1) of a data set.

Front

How do you calculate the IQR for the data set: 59, 60, 61, 62, 69, 70, 73, 74, 75, 75, 78?

Back

To calculate the IQR, first find Q1 (the median of the first half of the data) and Q3 (the median of the second half). For this data set, Q1 is 62 and Q3 is 75. Therefore, IQR = Q3 - Q1 = 75 - 62 = 13.

Front

What is a line of best fit?

Back

A line of best fit is a straight line that best represents the data on a scatter plot. It is used to show the relationship between two variables and can be used for predictions.

Front

True or False: All data points will always fit perfectly on the line of best fit.

Back

False. Data points may not fit perfectly on the line of best fit due to variability and outliers.

Front

What is the purpose of using statistics in data analysis?

Back

The purpose of using statistics in data analysis is to summarize, interpret, and draw conclusions from data. It helps in making informed decisions based on data.

Front

What is the difference between mean and median?

Back

The mean is the average of a data set, calculated by adding all the values and dividing by the number of values. The median is the middle value when the data set is ordered from least to greatest.

Front

How do you convert yards to feet?

Back

To convert yards to feet, multiply the number of yards by 3, since 1 yard equals 3 feet.

Front

If the Olympic record for the high jump is just over 2.6 yards, what is that distance in feet?

Back

2.6 yards is equal to 2.6 x 3 = 7.8 feet.

Front

What is a scatter plot?

Back

A scatter plot is a graph that displays values for typically two variables for a set of data. It uses dots to represent the values obtained for each variable.