Maths Flashcards

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1
Q

When should the chi-squared test be used?

A
  • Frequencies
  • Collecting data about the number of individuals in particular categories
  • Eg. Genetic cross experiments, choice chamber behavioural studies or count number of individuals of different species.
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2
Q

How do you do the chi-squared test?

A
  1. Degrees of freedom = number of categories - 1
  2. Compare calculated and critical at the value of 0.5 significance
  3. Calculated is greater than critical then reject the hypothesis as a significant difference not due to chance.
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3
Q

When should you use the student T-Test?

A
  • Collecting data that are measurements
  • Looking for differences between measurements of the same variable from different samples
  • Eg. two different environments same DV but different IV.
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4
Q

How do you use the student T-Test?

A
  • Degrees of freedom = number in sample 1 + number in sample 2 - no. of samples.
  • Compare the calculated value of T and critical value at p=0.05
  • If calculated is greater or equal to critical then reject the null hypothesis - less than 5% probability that the difference between mean values are due to chance
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5
Q

When should I use the Spearman Rank test?

A
  • Collecting data that are measurements
  • Looking for a correlation between measurements of the different variable from the sample.
  • Eg. leaf length and leaf width correlation or nitrogen conc and length of invertebrate.
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6
Q

When should the index of diversity be used?

A
  • Will be told to use!!
  • Investigate the species richness in a community
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7
Q

What is normal distribution?

A

Bell shaped curve of continuous variation eg. height or weight

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8
Q

What is the mean?

A

max height of normal distribution curve

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9
Q

What is standard deviation?

A

distance from mean when curve change from being convex to concave - gives measure of range of value on either side of mean.

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