STATISTISC 50 MCQ - 2

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

• Mean

• Median

• Mode

• Geometric mean

Which of the following is a measure of variability?

• Mean

• Standard deviation

• Percentile

• Median

When the distribution of scores is severely skewed, which measure of central tendency is most appropriate?

• Mean

• Median

• Mode

• Range

The interquartile range (IQR) represents:

• The distance between the highest and lowest scores

• The middle 50% of the distribution

• The standard error of the mean

• The difference between the mean and median

A negatively skewed distribution has:

• Mean greater than median

• Mean less than median

• Mean equal to median

• No relationship between mean and median

The standard error of the mean:

• Increases as sample size increases

• Decreases as sample size increases

• Is unaffected by sample size

• Is always equal to the standard deviation

If a variable is normally distributed, approximately what percentage of scores fall within one standard deviation of the mean?

• 50%

• 68%

• 95%

• 99%

Which type of graph is most appropriate for displaying the relationship between two continuous variables?

• Bar graph

• Pie chart

• Scatter plot

• Histogram

Which of the following correlation coefficients indicates the strongest relationship?

• r = 0.35

• r = -0.68

• r = 0.52

• r = -0.91

If two variables have a correlation of r = 0, this means:

• There is no relationship between the variables

• There is no linear relationship between the variables

• The variables are negatively related

• One variable causes the other