Psy315 Week 4

Pages: 3 (688 words) Published: May 14, 2012
Ch. 1, Practice Problems: 12, 15, 19, 21
Ch. 2, Practice Problems: 11, 12, 13, 16

Explain and give an example for each of the following types of variables: (a) Equal-interval is a variable that represents the same quantity being calculated. An example would be if you have two children who are 10 and 5 and another set of children who are 30 and 25 the age difference between both is still 5 which makes it and equal interval. , (b) rank-order is when the numbers in order have a value. An example would be coming in 1st, 2nd, or 3rd place (C) nominal is when values are types instead of quantities. An example of this could be types of mental illness, depression, schizoprinea,and post traumatic stress disorder. (d) Ratio scale is the scale that an equal interval is calculated on when it has got an absolute zero point. An example of this would be 1:4 people went to the concert as the map shows who attended both days’ events. 1:4 represent 1 out of 4 (e) Continuous variable is there are in theory an infinite number of values between any two values. Example of this is saying your son is 1 or 2 or saying he is 1.25 years old Following are the speeds of 40 cars clocked by radar on a particular road in a 35-mph zone on a particular afternoon: Make (a) a frequency table

Speed Frequency
15 1
20 1
23 1
24 1
27 1
28 1
30 3
31 3
32 3
33 2
34 4
35 2
36 6
37 2
38 1
40 3
42 1
45 1
46 1
52 2

Give an example of something having these distribution shapes: (a) bimodal- Distribution of male and female hair length in a company , (b) approximately rectangular –Distribution of the outcome of a dice toss (c) Positively skewed- A final exam for a calculus class...