Boxplot

What is the primary purpose of measures of central tendency?

• To measure data spread

• To identify the middle or typical value in a dataset

• To determine data shape

• To calculate percentiles

Which measure of central tendency is most affected by extreme values?

• Mode

• Median

• Mean

• Geometric Mean

In a right-skewed distribution, what is the relationship between mean and median?

• Mean equals median

• Mean is less than median

• Mean is greater than median

• No consistent relationship exists

The first quartile (Q1) represents which percentile of the data?

• 10th percentile

• 
  15th15th percentile

• 25th percentile

• 30th percentile

Which measure of variability is most commonly used in statistical analysis?

• Range

• Standard deviation

• Interquartile range

• Variance

Under the Empirical Rule, approximately what percentage of data falls within two standard deviations of the mean?

• 68%

• 95%

• 
  99.7%

• 75%

The maximum value minus the minimum value gives us the:

• Variance

• Standard deviation

• Range

• Quartile

Which measure best describes the symmetry of a distribution?

• Kurtosis

• Range

• Skewness

• Standard deviation

What is kurtosis a measure of?

• Central tendency

• Spread of data

• Tailedness of distribution

• Location of data

The median is also known as which percentile?

• 25th percentile

• 50th percentile

• 75th percentile

• 90th percentile