Exam 1

Question 1

sample

Question 2

population

Question 3

statistic

Question 4

paramater

Question 5

what are the main uses of descriptive statistics

Question 6

what are the main uses of inferential statistics

Question 7

what are independent, dependent, and attribute variables?

Question 8

what are the basic differences between the correlational and experimental methods? what types of conclusions can you make based on these methods?

Question 9

what is the quasi-experimental method, and how does it differ from the experimental method?

Question 10

what are the four major scales of measurement? how do they differ, and what qualities does each scale possess

Question 11

what is the difference between a discrete and continuous variable? why is this difference important?

Question 12

what is the difference between a simple and a grouped frequency distribution?

Question 13

Can you set up a simple frequency distribution and a grouped frequency distribution?

Question 14

what are real limits? when do we have to be concerned about using them?

Question 15

what are apparent limits? how do they differ from real limits?

Question 16

what is the difference between a bar graph, and a histogram? when is each used?

Question 17

in what ways are some graphs misleading?

Question 18

what is a frequency distribution polygon, and how is it set up?

Question 19

how are frequency distribution polygons and smooth curves related?

Question 20

how are the properties of symmetry, skew, and modality represented on smooth curves?

Question 21

How do you find percentiles and percentile ranks from simple and grouped frequency distributions using interpolation?

Question 22

what are the three measures of central tendency? under what conditions should each be used?

Question 23

calculate mean, mode

Question 24

Find the median, and use interpolation if there are tied scores near the center of a distribution

Question 25

what is a weighted mean, and when should it be used?

Question 26

what happens to the mean when we add or subtract a constant from every raw score?

Question 27

what happens to the mean when we multiply or divide every raw score by a constant?

Question 28

how are measures of central tendency affected by the shape of a distribution? (skew)

Question 29

what is meant by the statement, “the sample mean is an unbiased estimate of the population mean”?