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Julia M.

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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

what is an outlier?

What is the Hawthorne Effect

what is the definition of variables in terms of the techniques the researcher uses to measure

what does it mean when you reject the null hypothesis

what is reliability?

what is the difference between ratio and interval data

what is validity?

what is quantitative methodology

what is positive and negative correlation

What is nominal measurement?

What is ordinal measurement?

What is interval measurement?

What is ratio measurement?

What is an independent variable?

What is a dependent variable?

What is a control variable?

What is an extraneous variable?

What is a confounding variable?

What is reliability?

What is internal consistency?

What is internal validity?

What is external validity?

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