Statistic Tests -Module 4 Flashcards

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1
Q

Reason for selecting Standard deviation

A

This is a measure of spread in the data. This value gives an indication of the amount of spread

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2
Q

Reason for selecting student’s t-test

A

This looks for significant difference between two sets of data for one characteristic between two sub-groups

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3
Q

Reason for selecting spearmans rank correlation co-efficient

A

This looks for relationship between the data (mean) for two variables

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4
Q

Reason for selecting chi squared test

A

This looks for significant difference between observed results and what you might expect, where the data fits into categories

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5
Q

Example of standard deviation use

A

The effect of an environmental factor on a characteristic, e.g sunlight on plant height

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6
Q

Example of t-test

A

Comparing mean fruit weight for two crops grown in different fields

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7
Q

Example of spearmans rank

A

Height and width of limpets in a seashore

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8
Q

Example of use of chi-square test

A

Comparing results of an actual genetic cross with the predicted ratio

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9
Q

what do you do first before conducting a test

A

write hypthosies

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10
Q

How to evaluate method. What to talk about

A

-sample size
-repeats
-control experiments
-control variables
-Bias
-duration of experiment

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11
Q

What to mention when evaluating data

A

-state overall trend
-is there any overlap on data? E. G: SD bars
-is test group result different from control group result
-is there a statistic? What does it show?

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12
Q

What to consider when evaluating a conclusion

A

Consider both data and method

Use ALL information

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13
Q

nul hypothesis for t-test

A

This is a statement of what we would expect if there is no significant difference between two means, and that any differences seen are due to chance

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14
Q

degree of freedom formula t test

A

(n1 - 1) + (n2 - 1)

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15
Q

nul hypothesis for spearman rank

A

no correlation

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16
Q

nul hypothesis for chi squared

A

no significant difference between the expected and observed results, any differences that do occur are due to chance

17
Q

The degrees of freedom can be worked out from the results. e.g

A

It is calculated by subtracting one from the number of classes