PRACTICALS Flashcards
(13 cards)
what is the use of standard deviation
Measure range of values around the mean
what do overlapping standard deviation bars mean
the difference between two values is not significant
what is the use of the students t test
To find the difference between two means and whether it is significant
how to calculate degrees of freedom for the students t test
n-1
in the students t test, when to accept the null hypothesis
t value is less than the critical value
means difference is due to chance
in the students t test, when to reject the null hypothesis
t value is more than the critical value
means difference is not due to chance
what is the use of Spearman’s
Rank correlation
Used to see the strength of the correlation (association) between two sets of continuous data
how to calculate degrees of freedom for Spearman’s
Rank correlation
n-2
in Spearman’s Rank correlation, when to reject the null hypothesis
if your calculated number is the same or higher than critical value then your correlation is significant and you would reject the null hypothesis
in Spearman’s Rank correlation, what will the result always be between
1 and minus 1
what is the use of the Chi- Squared test
Used to compare observed results with theoretical expected frequencies. The higher the X2 value the greater difference.
how to calculate degrees of freedom for the chi squared test
(n‐1)
when to reject the null hypothesis for the Chi Squared test
Greater value than critical value
