S1 Wk 5 - Distributions, Samples and Populations Flashcards
data spread is known as a
distribution
the central limit theorem allows us to make
inferences about the population based on the sample data we have collected
what do samples refer to
the data we have collected on some topic, usually from human research ppts
What does population refer to
The total number of people that we have taken a sample from
what does the central limit theorem mean
The more data we sample the more accurate our sample distribution is to the population distribution
what are Descriptive statistics
a mathematical abstraction of our sample that simply describes what we’ve found - means, standard deviations etc
What is the standard error of the mean (SE)
Represents deviation of sample means from the population mean
What’s the point of calculating SE
Allows us to generalise from sample to population
what is the p value
The probability of the results occurring as extreme as observed if the null hypothesis was true
what Is statistical significance
When the P value is small enough to reject the null hypothesis
Is a type 1 error
When we observe a statistically significant result when there is no real relationship between our variables
false positive
What is a type 2 error
When we don’t observe a statistically significant result when there is a real relationship between our variables
false negative
Sample mean
The people participating in our study
What does population mean
The people where interested in generalizing to
What are randomized control trials RCT
Participants are recruited and then randomly allocated to groups
aims to reduce bias in research
maybe blinded so that only some of the researchers know who is in which group
