midterm Flashcards
(20 cards)
4 types of biological data
Nominal, ordinal, ratio and interval
Nominal variable
simple classification with no order of magnitude
ordinal variable
ordered value like small, medium, large
ratio variable
measurement with a true zero like length or weight
interval scale
measurement without a true zero like temperature
discrete data
numerical data that are isolated points on a number line
continuous data
set of values that form an interval on a number line like length or weight
parameters
characteristics of the population
statistics
characteristics of the sample
potential issue of mean
an extreme value can significantly impact
3 measures of central tendency
mean, median and mode
5 measures of dispersion
range, interquartile range, mean deviation, variance and standard deviation
histogram
graph using bars to represent continuoous variables
bar graph
similar to histogram but for categorical values
pie charts
categorical variables
line graphs
for continuous variables
point estimation
using a single value as a plausible value of a parameter
interval estimation
using an entire interval of reasonable values
null hypothesis
claim about a population characteristic that is initially assumed to be true
alternative hypothesis
competing claim
