Quiz 1

• can a quantitative variable be categorized into a categorical variable

  yes
• a histogram can show


  the frequency and relative frequency (probability) of values
• standard deviation doesn't change with linear transformations
• the mean of a sample is not always one of the observed values
• median is resistant to outliers
• measures of center and variability that are the most appropriate to describe a symmetric distribution

  mean, standard deviation
• measures of center and variability that are the most appropriate to describe a skewed distribution

  median, interquartile range
• mean < median


  left-skewed
• mean > median


  right-skewed