Data Analysis Comprehensive Review

Front

What percentage of data lies within 1 Standard Deviation of the Mean?

Back

68% of the data lies within 1 Standard Deviation of the Mean.

Front

What is the most fair sampling method to represent survey subjects?

Back

Every 100th person at a shopping mall.

Front

Define Sample Deviation.

Back

Sample Deviation measures the amount of variation or dispersion of a set of values.

Front

Define Sample Variance.

Back

Sample Variance is the average of the squared differences from the Mean.

Front

What is Variance?

Back

Variance measures how much the values in a data set differ from the mean (average).

Front

What is the formula for Sample Deviation?

Back

Sample Deviation = sqrt(Sample Variance).

Front

What is the formula for Sample Variance?

Back

Sample Variance = Σ(xi - x̄)² / (n - 1), where xi is each value, x̄ is the mean, and n is the number of values.

Front

What does a lower variance indicate about a data set?

Back

A lower variance indicates that the data points tend to be closer to the mean.

Front

What does a higher variance indicate about a data set?

Back

A higher variance indicates that the data points are spread out over a wider range of values.

Front

What is the relationship between Standard Deviation and Variance?

Back

Standard Deviation is the square root of Variance.