Chapter 2 homework

In which of the following examples is the median the preferred measure of central​ tendency? Select all that apply.

The distribution of the number of children in a household The distribution of annual household income

Choose the correct answer.

The mean is the average number of words learned found by dividing the total number of words learned by the number of infants in the study. The median is the middle value in the ordered list of number of words learned. The standard deviation is roughly the average amount the number of words learned for the infants differ from the mean.

Explain what the results mean to a person who has never had a course in statistics

The mean is the average or center value in the distribution of the amount of increase in activation of their amygdala. The standard deviation is the average amount that the amount of increase in activation differs from the mean value.

Describe and explain the difference between the​ mean, median, and mode. Choose the correct answer below.

The mean is the sum of the scores divided by the total number of scores. The median is the middle score when all the scores in a distribution are arranged in order of value. The mode is the value with the greatest frequency in a distibution.

Explain why the standard deviation is more often used as a descriptive statistic than the variance. Choose the correct answer below.

The standard deviation gives a more direct sense of the variability of the data since it has the same dimensions as the data values themselves rather than the squares of the data values.

Describe the variance and standard deviation. Choose the correct answer below.

The variance is the average squared deviation from the mean. The standard deviation is the square root of the variance or roughly the average deviation from the mean.