Exam 19: Statistics in Psychological Research

A researcher measures the number of times each of six rats has to run a maze before it masters the maze. The number of times recorded for each rat is 2, 3, 3, 4, 5, 7. In this example, the ____.

Batina is a conservative investor, much to the chagrin of her husband. He cannot believe she values stability in an investment over the historical rate of return. The standard deviations of the following returns of investment are given below. Which investment should Batina choose?

Professor Kipling is discussing statistics in your introductory psychology class. She explains that descriptive statistics are invaluable because they allow psychologists to ____.

If your research study had more than two experimental/control groups and encompassed more than one independent variable, you would have to use a(n)____ to determine the differences between the groups.

Descriptive statistics will allow you to compute ____.

Fiona, a quantitative psychologist, is interested in using inferential statistics because they provide ____.

To calculate the mean of a set of data, you add up all the scores and divide the result by the ____.

What does it mean if the standard deviation of a distribution of quiz grades is 0?

Eunice is a new elementary school principal. One of her first projects is to determine whether students have been appropriately assigned to either the Sparrow, Blue Jay, or Robin reading groups. She administers the Miller Reading Ability Test (MRAT)to all three groups. What statistical analysis should Eunice use to compare the means of the three groups?

Dr. Yodela wants to find out whether there is a significant difference in the mean scores of two groups on his new intelligence test. Which statistic should Dr. Yodela use?

The mean is ____.

Your instructor comes to class with the results of the last quiz. She tells you that the average score was 7 (out of a possible 10)and that the median was 6. These are measures of ____.

Consider the following data set: 2, 2, 3, 3, 3, 4, 4, 5, 5, 92. If the last value (92)is removed from the data set, which statistical measure will change the most?

In a normal distribution of scores, which of the following is true?

Alejandra is interested in describing the spread of the scores in her data set. She should calculate the ____ of the data set. ​

Renata runs a study looking at the drinking habits of undergraduates, and suspects the results would show that the amount a student drank will be related to his or her grade-point average (GPA). Instead, she finds that drinking habits (amount of drinks per week)are not related to GPA. This means that ____.

Joe has collected data on the number of hours ten-year-olds spend watching television each week. He tells you that the distribution of scores followed a truly normal curve. Which of the following is suggested by Joe's statement?

Your friend places 11 numbers into a hat without showing you what those numbers are. He tells you he will give you $10 if you can guess the exact number that he will randomly pick out of the hat. He says that the mean of the numbers is 5, the median is 6, and the mode is 8. What would your best guess be?

Clint has learned his standard score on a standardized achievement test is -1 (minus one). What percentage of test takers performed better than Clint?

Which of the following is one of the basic categories of descriptive statistics?