For most distributions, approximately _____ of the scores will be located within one standard deviation of the mean

The results from a research study indicate that adolescents who watch more violent television also tend to engage in less violent behavior than their peers. The correlation betwen the amount of violent TV content and the amount of violent behavior is an example of ______ .

Which of the following research methods allows researchers to establish causal relationships?

The symbol that corresponds to the standard error of the mean is _____

In analysis of variance, the term factor refers to ______ .

A common science-fair project involves testing the effects of music on the growth of plants. For one of these projects, a sample of 24 newly sprouted bean plants is obtained. A researcher is interested in how music and watering schedule may influence plant growth. Plants are broken into 4 groups. For the watering schedule, plants are either watered during the morning or at night. For music, the plants are exposed to either classical music or rock. These plants are randomly assigned to one of four groups, with 6 plants in each group. After two weeks, the height of each plant is measured and recorded. What test will tell you whether the type of music played or the watering schedule affects plant growth? 

How many samples would be needed for a two-factor study with 2 levels of Factor A and 6 levels of Factor B?

Favorite color is what type of data?

What does standard deviation measure? 

Which type(s) of frequency distribution graph(s) should be used for data that come from a nominal scale of measurement?