Exam 17: Statistical Methods

Stefan has collected a large amount of data in a study designed to test the effectiveness of a new drug meant to slow the progression of Alzheimer's disease.To test whether the drug was effective in a group of participants who received it,in comparison to a group that received a placebo,which type of statistics should Stefan use?

The standard deviation

In a strongly skewed distribution,the best indicator of central tendency is usually the

The three measures of central tendency tend to converge in a

The symmetric,bell shaped curve that represents the pattern in which many human characteristics are dispersed in the population is known as a

The two major strengths of the empirical approach are

Dr.Kleiman gives an exam where most of the students receive failing grades and only a few students receive high scores.When the exam scores are plotted,the distribution will be

Before you construct a histogram you need to

The index of the amount of variability in a set of data is known as the

In a normal distribution,most scores fall near the ____ of the distribution,and the number of scores gradually ____ as one moves away from the mean.

When a distribution of scores is not symmetrical and many scores pile up at the low end of the scale,the distribution is a

Generally,the MINIMUM requirement for statistical significance is that there is less than ____ that the observed results are due to chance.

A professor who has two sections of the same course gives an exam.Both classes have the same mean score on the exam.However,in Class A most students scored relatively close to the mean,while in Class B many students scored either much higher or much lower than the mean.Which statement best describes the distribution of grades for the two classes?

You find a correlation of .44 between a measure of subjects' extraversion and their reports of how many people they have dated in the last two years.This finding means that

High scores on variable X are associated with high scores on variable Y,and low scores on variable X are associated with low scores on variable Y.Hence,the correlation between variables X and Y will be

The square root of Sd²/n is the formula for the

Al and Carmen have the same bowling average,but Al is much more erratic than Carmen.If we compute the standard deviations for their respective distributions of bowling scores,which of the following will be true?

Kurt has collected data on the relationship between the number of hours the employees at a large number of corporate headquarters spend working on their computers and the profits of the corporations.His scatter diagram of the data shows it clusters near a line running from the bottom left corner to the top right corner

In the formula for the standard deviation,the symbol S stands for

Professor Latimore gives an exam that turns out to be exceptionally easy and everyone does well,yielding a