Exam 1: Introduction and Mathematical Preliminaries

Dr.Johnson hypothesizes that NutraSweet reduces short-term memory.In order to test her hypothesis she gives 10 subjects a beverage containing NutraSweet (treatment group)and 10 subjects a beverage without NutraSweet (control group).She then measures the subject's ability to recall a list of numbers.Dr.Johnson's dependent variable is measured using _____scale of measurement.

In statistics Probabilities have a precise meaning.

Calculate SX and SX² for the following data set: 1,3,3,5.

In a study on the effects of stress on alcohol consumption,stress is the independent variable.

A _____ variable can theoretically include an infinite number of values between any two points.

A sample is an aggregate of all cases to which one wishes to generalize statements.

Variables that can assume only a finite number of values or that have a finite number of values that can occur between any two points are called _____ variables.

If one is studying intelligence as a consequence of differing child-rearing practices,then the measure of intelligence is called _____.

The probability of observing both an even and an odd number when rolling a 6-sided die is ____.

The symbol or sigma means to____________________.

The real limits of the number 2 are 1.50 and 2.50.

List the five general activities that characterize scientific research.

A(n)_____is an educated guess about what the results will be.

Statistic is to parameter as _____ is to _____.

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

Given the scores 1,1,2,2,3,3,4,what is the value of the following summation notation? 4 S X I = 2

The use of random sampling procedures:

A statistic is based on a ____________________of the population.

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. The dependent variable in the above study is:

Studies concerned with the effectiveness of subliminal perception have looked at changes in product desirability as a function of messages presented at sub-threshold levels of stimulation.In those studies,the measure of desirability is called the _____ variable.