PSY 2310 - MODULE 5
X Y 5 4 6 4 8 3 9 6 7 3 9 2 ΣX =
144
X Y 5 4 6 4 8 3 9 6 7 3 9 2 ΣXY =
161
X Y 5 4 6 4 8 3 9 6 7 3 9 2 (ΣX)2 =
1936
Find the median of this frequency table of scores. X f 3 4 2 7 1 5 0 1
2
Find the mode of this set of scores. X f 3 4 2 7 1 5 0 1
2
Find the mean for the set of scores below. X f 4 3 3 7 2 6 1 2
2.61
X Y 5 4 6 4 8 3 9 6 7 3 9 2 ΣY =
22
Compute the median for this list of scores: 2, 2, 3, 3, 3, 5, 6.
3
Compute the mode for this list of scores: 2, 2, 3, 3, 3, 5, 6.
3
Find the median for the set of scores below. X f 4 3 3 7 2 6 1 2
3
Find the mode for the set of scores below. X f 4 3 3 7 2 6 1 2
3
Compute the mean for this list of scores: 2, 2, 3, 3, 3, 5, 6.
3.43
X Y 5 4 6 4 8 3 9 6 7 3 9 2 ΣX2 =
336
X Y 5 4 6 4 8 3 9 6 7 3 9 2 (ΣY)2 =
484
The median is also known as the __________.
50th percentile
Find the median of this list of scores: 5, 6, 4, 7, 8. [Hint: What is the first step to finding the median?]
6
Using Figure 2.7, what was the mean of the data?
73.00
X Y 5 4 6 4 8 3 9 6 7 3 9 2 ΣY2 =
90
When a distribution of scores is skewed, the median and the mean will be similar.
False
When entering data into SPSS, you can enter a frequency table of the data; you do not have to enter each score individually.
False
The sample mean is represented by __________.
M
What measure of central tendency is the value that has half of the scores above it and half the scores below it?
Median
What measure of central tendency should be used when a distribution of scores measured on the interval or ratio scale of measurement is skewed?
Median
When your data is ordinal, what is the best measure of central tendency to use?
Median
The mode is the best measure of central tendency for data measured at what level?
Nominal
What does the ΣX tell you to do?
Sum the scores (Xs).
What does N represent?
The number of scores.
When a distribution is symmetrical, the mean, the median, and the mode will have similar values.
True
When is the mean the best measure of the center of a distribution?
With interval/ratio data that does not have extreme scores.
A statistical formula is __________.
a helpful set of instructions indicating how to compute something
What is the median for this set of scores? 3, 3, 3, 4, 4, 5, 5, 5
b. 4
What measure of central tendency should be used with ordinal data?
b. Median
What measure of central tendency is used when data are measured on a nominal scale?
c. Mode
What measure of central tendency is obtained by adding all the scores and then dividing by the number of scores?
c. Mean
Which of the following is the best way to compute the mean for the following data? X f 3 4 2 7 1 5
m= 3(4)+ 2(7)+ 1(5)/16
What measure of central tendency should be used when the data are interval and there are extreme scores in the distribution?
median
Extreme scores are also called __________.
outliers
The population mean is represented by __________.
μ
