Exam 1: Introduction and Mathematical Preliminaries

Use the following data to answer SY² =_____

What type of scale is being used for each of the following measurements? a.The number of arithmetic problems correctly solved b.Class standing (i.e.One's rank in the graduating class) c.Type of phobia d.Body temperature in (F) e.Annual income in dollars f.Place in dog show g.Heart rate in beats per minute

A _____ is the aggregate of all cases to which one wishes to generalize statements.

A statement proposing that something is true about a given phenomenon is called a _____.

6.39489 rounded to three decimal places is equal to ___.

Round off the following numbers to two decimal places (nearest hundredth). a.144.135 b.67.245 c.99.727 d.13.345 e.7.3451 f.5.9817 g.5.997

Numerical indices based on data from entire populations are called ____.

When the Professor tells the class the mean on the exam.She/he is using _____.

The use of random sampling procedures:

Distinguish between an independent variable and a dependent variable.

What are the four levels of measurement,in order from the lowest to the highest level in the measurement hierarchy?

The students in class vary considerable in weight and height.Both weight and height are considered _______ variables.

An experiment tested whether the context of the learning environment was important in memory recall.Sixteen people learned a list of 40 unrelated words either inside a room or outside of a house on a patio.Later they were asked to recall the words in either the same environment they learned the list of words in or the alternative environment.The number of correctly recalled words was measured. What level of measurement is the independent variable?

ÓX tells us to add up,or sum,all of the individual X scores.

Which of the following is a discrete variable?

The determination of whether a variable is measured on an ordinal,interval,or ratio level is usually a straightforward matter in the behavioral sciences.

Use the table below solve the equations a-f. a.SX= b.(SY)²= c.SY X d.SY= e.SY²= f.(SY)(SX)=

When Doctors are studying the effects of Ritalin on the number of words recalled the dependent variable is considered ____________________.

Distinguish between quantitative and qualitative variables.

A researcher studies the relationship between the amount of time spent studying for an exam and the number of errors made.A sample of twenty students who have the same GPA are randomly assigned to one of four groups: 1,2,3,or 4 hours of study time.After studying the specified time,all students took an identical exam and the number of errors each student made was counted. Which of the following variables was held constant in the study?