Exam 1: Introduction to Statistics.

A researcher records the change in weight (gained or lost)during the first semester of college for each individual in a group of 25 freshmen,then calculates the average change in weight.The average is an example of a _______.

What is the final step to be performed when computing Σ(X - 2)²?

For statistical purposes,it usually is not important to differentiate between which two scales of measurement?

If it is impossible to divide the existing categories of a variable,then it is an example of a(n)_____ variable.

For a research study comparing attitude scores for males and females,participant gender is an example of what kind of variable?

What scale of measurement is being used when a teacher measures the number of correct answers on a quiz for each student?

For the following scores,Σ(X + 1)= 9. Scores: 1,3,0,1

Using letter grades (A,B,C,D,and F)to classify student performance on an exam is an example of measurement on a(n)_______ scale of measurement.

You are instructed to subtract 4 points from each score and find the sum of the resulting values.How would this set of instructions be expressed in summation notation?

Calculate each value requested for the following set of scores.Scores: 2,3,0,5 a.ΣX b.ΣX² c.(ΣX)²

A researcher uses an anonymous survey to investigate the television-viewing habits of American adolescents.Based on the set of 356 surveys that were completed and returned,the researcher finds that these students spend an average of 3.1 hours each day watching television.For this study,the set of 356 students who returned surveys is an example of a _______.

In a correlational study,

You are instructed to subtract 4 points from each score,square the resulting value,and find the sum of the squared numbers.How would this set of instructions be expressed in summation notation?

What is the value of Σ(X - 2)² for the scores 2,3,5?

What is the value of ΣX + 1 for the scores 1,0,2,4?

The average verbal SAT score for the entire class of entering freshmen is 530.However,if you select a sample of 20 freshmen and compute their average verbal SAT score you probably will not get exactly 530.What statistical concept is used to explain the natural difference that exists between a sample mean and the corresponding population mean?

Calculate each value requested for the following set of scores. X Y 1 5 3 1 0 -2 2 -4 a.ΣX b.ΣY c.ΣXΣY d.ΣXY

A researcher uses an anonymous survey to investigate the television-viewing habits of American adolescents.The entire group of American adolescents is an example of a _________.

For the following scores,Σ(X - 1)= 10.Scores: 1,3,7

Organizing a set of scores in a table is an example of using _______.