Under what circumstances is the median or mode a better measure of central tendency than the mean? Explain your response
1. Outliers- the mean is skewed by them. 2. Skewed data- the mean loses its ability to provide the best central location for the data because the skewed data is dragging it away from the typical value
A researcher is studying reading rates in milliseconds per syllable. What scale of measurement—nominal, ordinal, interval, or ratio—is time in milliseconds? Explain your response
Ratio because it has an absolute zero, thus you can compare response time to a zero point in time
True or false- the standard deviation and the range are sensitive to outliers
true- throws the standard deviation off when you have a cluster of data
True or false: The standard deviation can never be 0. Explain your response
False because If the numbers in the data set are equal then there will be no variation from the mean
The Pearson r correlation coefficient is used with ____ level data. Pearson r coefficients can range from __ to __.
Interval; -1; +1.
A researcher is investigating the effects of anxiety on creativity. Individuals with varying levels of anxiety are asked to complete a measure of creativity. The results show a classic U-shaped distribution; that is, individuals with moderate levels of anxiety score the highest on tests of creativity. Individuals with very low or very high levels of anxiety score much lower on tests of creativity. Would the Pearson r correlation coefficient be a good statistic to use in this case? Explain your response
No because levels of anxiety are measured on a ordinal scale- ex: low/medium/high. Creativity test scores are measured on a nominal scale because you assign a number to distinguish the test scores