Exam 1 Flashcards
What is the median of the following percentile ranks? 30 40 50 60 70 80 A) 55 B) 45 C) Cannot be computed D) 50 E) 65
A) 55
You have conducted a research study in which you examined whether males and females score differently on a measure of IQ. You also measured all of your subjects self-esteem to see if it predicted IQ.
What is/are the independent variable(s) in this study?
A) Self-esteem and IQ
B) Gender and self-esteem
C) IQ
D) Subjects and gender
E) None of the above
B) Gender and self-esteem
You have conducted a research study in which you examined whether males and females score differently on a measure of IQ. You also measured all of your subjects self-esteem to see if it predicted IQ.
What is/are the dependent variable(s) in this study?
A) Self-esteem and IQ
B) Gender and self-esteem
C) IQ
D) Subjects and gender
E) None of the above
C) IQ
A sample of biology majors (n=25) and a sample of psychology majors (n=3) were each given a test of verbal ability. Which sample is likely to have the most variance?
A) Not enough information to determine
B) The biology sample is likely to have more variance
C) The psychology sample is likely to have more variance
D) The samples are likely to have the same variance
A) Not enough information to determine
On a Likert scale rating fondness of ice cream (1 to 5, with 5 being the most fond of ice cream): Yolanda scores a 4, Sarah scores a 2, and Travis scores a 1. Assuming the Likert scale captures intervally scaled data, Sarah likes ice cream: A) Half as much as Yolanda B) Twice as much as Travis C) All of the above D) None of the above
C) All of the above
Assume that you have 3 dogs (classified as 1), 2 cats (classified as 2), and 5 snakes (classified as 3) in a study. What is the median of this variable? A) Not enough information to determine B) 2.5 C) 5 D) 2 E) Cannot be computed
E) Cannot be computed
Robin has just handed back the midterm exams for EDER 5210. He has misplaced Patricia's exam, but is able to remember that her score was the mean score for the class. He also remembers that the median score was 89%. Patricia is hoping for an A (A=90 or above), so she smiles when Robin says that the distribution of scores was: A) Platykurtic and symmetrical B) Positively skewed C) Negatively skewed D) Symmetrical
B) Positively skewed
The SD of a set of scores (n = 7) is 22.83 with a mode of 89. Given the first 6 scores below, what must the last score be? 45 67 43 89 95 49 A) 68.14 B) 89 C) Not enough information to determine D) 40 E) 58
B) 89
Which of the following is false concerning percentile ranks?
A) They describe scores in the context of other scores in the distribution
B) They represent an ordinal scale
C) They describe scores in a distribution
D) They exaggerate score differences in the tails of a distribution
E) None of the above
B) They represent an ordinal scale
A population is always defined by: A) The population parameters that one hopes to use B) The nature of your research question C) None of the above D) The statistics that one hopes to use
B) The nature of your research question
In a distribution, one function of the mean is to:
A) Determine the relationship between variables
B) Increase the accuracy in predicting the relationship between variables
C) Standardize the scores
D) Balance the distribution
D) Balance the distribution
A student scores 72 in English, 85 in history, and 91 in statistics. What information do you need in order to determine in which class the student has performed the best (relative to each class’s distribution)?
A) The range, mean, and sample size, so you can determine the Z scores
B) The range and mean, so you can determine the weighted average
C) The mean and standard deviation, so you can compute the Z scores
D) The mean, sample size, and kurtosis, so you can compare distributional shapes
C) The mean and standard deviation, so you can compute the Z scores
You make a Z score of -1 on this midterm exam. Assuming the scores are normally distributed, you scored better than how many other scores? A) 84% B) 16% C) 26% D) 34% E) None of the above
B) 16%
Which of the following statements regarding Z scores is true?
A) Z scores are the most accurate measure of variability (or spreadoutness)
B) A Z score distribution always has a mean of 0 and a standard deviation that falls between 0 and 1
C) A Z score distribution always has a mean of 1 and a standard deviation of 0
D) The distribution of Z scores matches the shape of the distribution of the raw scores
D) The distribution of Z scores matches the shape of the distribution of the raw scores
Which of the following is a major limitation for using the range as a measure of variation?
A) It is difficult to compute
B) It takes into account all the scores
C) It can be excessively influenced by extreme scores
D) The range always remains the same across different group sizes
C) It can be excessively influenced by extreme scores
