Algebra 1 Keystone review

Front

What is the median in a data set?

Back

The median is the middle value when the numbers are arranged in order. If there is an even number of observations, the median is the average of the two middle numbers.

Front

How do you determine the line of best fit for a set of data?

Back

The line of best fit is determined by analyzing the data points and finding a linear equation that best represents the trend of the data. This can be done using methods like least squares.

Front

What is a function in mathematics?

Back

A function is a relation where each input (x-value) has exactly one output (y-value). If a single x-value corresponds to multiple y-values, it is not a function.

Front

How do you calculate the percentage of a number?

Back

To find what percent of a number is another number, divide the part by the whole and multiply by 100. For example, to find what percent 3 is of 29: (3/29) * 100 = 10.3%.

Front

What is the formula for calculating slope between two points?

Back

The slope (m) between two points (x1, y1) and (x2, y2) is calculated using the formula: m = (y2 - y1) / (x2 - x1).

Front

What does a stem-and-leaf plot represent?

Back

A stem-and-leaf plot is a method of displaying quantitative data in a graphical format, similar to a histogram, to retain the original data values while showing their distribution.

Front

What is the difference between linear and non-linear functions?

Back

Linear functions create a straight line when graphed, while non-linear functions create curves. Linear functions have a constant rate of change, whereas non-linear functions do not.

Front

What is the significance of the y-intercept in a linear equation?

Back

The y-intercept is the point where the line crosses the y-axis. It represents the value of y when x is 0 in the equation of the line.

Front

How do you interpret a negative slope?

Back

A negative slope indicates that as the x-value increases, the y-value decreases. This shows an inverse relationship between the two variables.

Front

What is the purpose of finding the line of best fit in data analysis?

Back

The line of best fit helps to summarize the relationship between variables, making it easier to predict future values and understand trends in the data.