BIOL2022 L01 Why statistics? Organisms are variable in a variable world.

Description

Module 1, Lecture 1 SUMMARY: - Must make questions explicit, and state hypotheses and logical predictions - Correlative approach will tell you that a pattern exists, but (in most cases) only an experiment will tell you why - A simple framework can make life easier!
Michael Jardine
Quiz by Michael Jardine, updated more than 1 year ago
Michael Jardine
Created by Michael Jardine over 5 years ago
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Resource summary

Question 1

Question
Variability, intrinsic vs extrinsic: Measurement error is an example of [blank_start]____________[blank_end]; ‘natural’ variation within the system (e.g. body sizes of different individuals) are an example of [blank_start]____________[blank_end].
Answer
  • Extrinsic
  • Intrinsic
  • None! Stupid answer.

Question 2

Question
Dispersion, spread: [blank_start]____________[blank_end] is the square root of [blank_start]____________[blank_end].
Answer
  • Standard deviation
  • Variance
  • Standard Error

Question 3

Question
Complete the following formula:
Answer
  • n (sample size)
  • variance
  • standard deviation
  • standard error

Question 4

Question
When to use main tests: Differences between 2 means: [blank_start]____________[blank_end]; Differences between >2 means: [blank_start]____________[blank_end]; Linear and/or curvilinear relationships: [blank_start]____________[blank_end]; Frequencies (counts): [blank_start]____________[blank_end]; (All of these test null hypotheses)
Answer
  • t-test
  • ANOVA
  • Regression and correlation
  • G test and Chi squared
  • Chi squared only
  • Regression only
  • Correlation only
  • G test only

Question 5

Question
Correlation vs regression:
Answer
  • Correlation defines a relationship between variables (causal or not)
  • Regression states that one variable predicts another
  • Regression defines a relationship between variables (causal or not)
  • Correlation states that one variable predicts another
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