Research Class 7 Part 1

there are two types of statistical analysis you can conduct which are?

descriptive, inferential

what are descriptive studies used for

describe and synthesize data

what are inferential stats used for

make inferences about the population based on sample data

The ___ of the instrument will determine the type of test required!

level of measure

two overarching types of variables

continuous, categorical

categorical means the variables are in CATERGORIES, and what are the 2 types here?

nominal, ordinal

continuous variables means the number is on a continuum, there is a range. there are two types which are…

ratio and interval

categorical variables are much ___

weaker

in nominal variables, any number can be assigned to the groups, for example…

male = 1, female = 2

these numbers are arbitrarily assigned so that the computer can __ them

process

ordinal does have discreet categories but there is some type of order to them, for example…

(always have some type of descriptor)

how well was the exam? poor, moderate, fair, excellent

___ have meaningful numbers assigned to them, the distance between values are known

interval and ratio

there is no true ___ in interval

zero

which acronym will help you understand the order of measure

NOIR

what are the 3 types of descriptive stats?

frequency distribution, measures of central tendency, measures of variability

which measures are for interval/ratio levels of measure only?

measures of central tendency, measures of variability

most basic way to illustrate data

frequency distribution

frequency distribution is for all levels of measure, and is a method of tallying that represents how ___ certain scores occur

often

in frequency distributions, scores are usually grouped into ___ or ranges of numbers

class intervals

Frequency Distribution Data are displayed as…

tables, histograms, polygons

for nominal and ordinal data you can only use a ___

bar graph

frequency distribution for categorical data (nominal and ordinal) can use bar graphs, bar charts, or tables with the N per group.

the data does not ___ across categories

overlap

histograms and polygons are for ___ variables

continuous