Vocab/ scale of measurement
A researcher is curious about the average IQ of registered voters in California. If this average could be obtained, it would be an example of a ___
A. Sample B. Statistic
C. Population D. Parameter
Parameter
Draw the symbol that stands for the raw score of one variable
X
A researcher observed that preschool children playing in a red room showed more aggression than children playing in a blue room. For this study, what is the independent variable?
A. Preschool children
B. Color of the room
C. Amount of aggression
D. None of the above
B. Color of the room
The normal distribution is an example of
A. A polygon
B. A histogram
C. A smooth curve
D. A bar graph
Smooth curve showing data from a population
If we are measuring something to the nearest tenth of a second, what is the lower real limit for 3.2 seconds?
3.15
Nominal or Ordinal
n refers to
A. The raw score of one variable
B. The sum of
C. The number of scores in a population
D. The number of scores in a sample
D
A research study reports that alcohol consumption is significantly higher for students at a state university than for students at a religious college. This research is an example of a ____
A. Descriptive method
B. Correlational method
C. Non-equivalent group
D. Pre-post study
E. Experimental method
C
The classrooms are numbered from 100 to 108. A professor records the number of classes held in each room during the fall semester. If these values are presented in a frequency distribution graph, what kind of graph would be appropriate?
Bar graph
For this set of scores, find ∑X² :
X --> 3, 4, 5, 2
54
What scale of measurement is being used when Tina measures the age of participants split among 2 groups (20 and younger, 21 and older)
Ordinal
"What percentage of students are Psychology major?" This is an example of__
A. Descriptive statistic
B. Inferential statistic
C. Non-equivalent group
D. Pre-post study
E. Experimental method
A
Pr. De Dios calculates the grades of the 1st midterm. She finds that students did well, with most students scoring 98 or higher. What type of distribution is Pr. De Dios most likely to have?
Negatively skewed distribution
Calculate ∑ (X-2)2 for the following set of scores:
| X | f |
|---|---|
| 5 | 6 |
| 4 | 5 |
| 3 | 5 |
| 2 | 3 |
| 1 | 2 |
81
A set of score range from 72 to 78. If the scores were put in a grouped frequency distribution table, what would be the best choice for the interval width?
A.5 B.10 C.7 D.2
2