1.5 Variability + Inferential Statistics

Question 1

more variability = higher or lower standard deviation?

Answer 1

higher!

Question 2

ultimate objective of inferential statistics is to say:

Answer 2

“on the basis of what we have observed in our sample, we can make this conclusion about the population”

Question 3

population is…

Answer 3

the ENTIRE COLLECTION in which you are interested
* properties are called parameters

Question 4

sample is…

Answer 4

SELECTION from entire collection in which you are interested
* properties are called statistics

Question 5

sampling distribution is

Answer 5

hypothetical distribution based on a hypothetical set of sample means. standard dev of these means is called standard error
* hypothetical: would never actually run an experiment that many times
* shows us the likelihood of obtaining a result if the null is true
* shows variability across experiments

Question 6

p value cutoff

Answer 6

p > 0.05 retain null (nothing is happening)
p < 0.05 reject null (something is happening)
* the smaller ur p the more excited you are!!