Psych Stats 230

What is the value of ∑(X + 1) for the following scores: 0, 3, 5?

11

What is the last step to be performed when computing ∑(X − 1)2?

add the squared (X − 1) values

A researcher recorded salary and weight for a group of women and found that as weight increased, salaries tended to decrease. What kind of research design was used for this study?

correlational

A recent study reports significantly higher alcohol consumption for students at a state university than for students at a religious college. What kind of research design was used for this study?

nonexperimental

A research study reports that adolescent boys have higher levels of self-esteem than adolescent girls do. What kind of research design was used for this study?

nonexperimental

Jones, Thomas, and Piper (2003) recruited students from bars and restaurants and asked them to rate the attractiveness of women shown in photographs and to describe their current state of intoxication. The study found that participants who were moderately intoxicated produced higher attractiveness ratings than those produced by sober participants. What kind of research design was used for this study?

nonexperimental

Which of the following is an example of a discrete variable?

number brothers and sisters

A researcher would like to know the average number of text messages sent by American high school students during a typical day. If this average could be obtained, it would be an example of a ________.

parameter

A value describing the entire group that a researcher wants to study is called a ________.

parameter

Measuring weight in grams is an example of using which scale of measurement?

ratio

If a researcher is able to say that Tom's score is 3 points higher than Bill's score, then what scale of measurement is being used?

ratio or interval

A researcher who is interested in the political attitudes of adolescents, selects a group of 30 middle school students to participate in a research study. The group of 30 students is an example of a ________.

sample

A researcher is interested in how temperature influences activity level. A group of 20 preschool students is observed for 30 minutes of play time each day and the researcher measures the activity level for each child. The average daily amount of activity for the group of 20 is an example of a _________.

statistic