Exam 11: Introduction to Data Analysis

If the scores on a test are normally distributed,what percentage will be within two standard deviations of the mean?

Descriptive statistics deal with whether or not a statistically significant difference exists.

Many statistical analyses are based on the assumption that the data are distributed normally.

Hypothesis testing is a function of inferential statistics.

Which correlation is used when there are two ordinal variables?

Data transformation involves modifying data so they are more consistent with the theory.

Describe the phenomenon of fishing and explain how it is related to error.

Alan has developed an intervention that can be used by family resource networks to provide basic child development information to high-risk families.Although he has trained at least one person from each family resource network and has excellent program documentation,he is still concerned.Specifically,Alan is probably worried about ____.

The problem known as _______________ occurs when multiple analyses are conducted and they are treated as independent.

The ____ is commonly called the average.

The branch of statistics that allows researchers to test their hypotheses is called ____ statistics.

Identify and describe the major potential sources of noise in research.

What is the mode of this set of scores? 4,4,7,3,6,10,2,7,3,10,4,8,2,2,2

The ____ is the spread of the scores around their average in a single sample.

Robb carefully designed a study to test a method for reducing test anxiety among students.On the day he conducts his post-test,a broken water main nearby results in jack hammering and other construction sounds that are seem to be distracting research participants.Robb's ability to detect differences among his groups may have been compromised by ____.

The probability that the researcher will conclude there is a relationship when in fact there is one is referred to as statistical _______________.

The _______________ is the score found at the exact middle of the set of values.

Data preparation involves making graphs that show the distributions of the data.

A weak intervention can result in increased risk of ____.

If data on a particular variable are skewed in the positive direction,then taking the square root can make the data look closer to a normal distribution.This is referred to as data ____.