Studied by 0 peopleWhich test do you use if you are testing for a correlation?
PMCC test
Which test do you use if you are testing for an association?
SRCC test
Which test do you use if you are testing for an association and have data in a contingency/two way table?
Chi Squared Test
Which test do you use if you are comparing the mean to a given value?
Normal Z Distribution
Which tests do you use if you are comparing the population average of two paired samples?
Paired sample Wilcoxon Signed Rank
Paired sample Sign Test
Which tests do you use if you are comparing the population average to a given value?
Single sample Wilcoxon Signed Rank
Single sample Sign Test
Which test do you use if you are comparing the population difference of two non-paired samples?
Wilcoxon Rank Sum
Define a Type I error
Reject H0 when it is true
What is the probability of a Type I error?
The same as the significance level
Define a Type II error
Accept H1 when it is false
What is the Central Limit Theorem?
If n >30, then we can find probabilities about a mean even if the original distribution wasn’t a normal distribution
Define the term parameter
A numerical value of a population
Define the term statistic
A numerical value of a sample
What assumptions about the distribution are required for the sign test to be valid?
No assumptions
What assumptions about the distribution are required for the Wilcoxon signed rank test to be valid?
distribution is symmetrical
distribution of differences is symmetrical for a paired test
What percentage of data lies within one standard deviation of the mean in a normal distribution?
68%
What percentage of data lies within two standard deviations of the mean in a normal distribution?
95%
What percentage of data lies within three standard deviations of the mean in a normal distribution?
99.8%
What must you do to the data before you can calculate the SRCC value?
Rank the data
What are H0 and H1 for a SRCC test?
H0: no association between x and y
H1: positive/negative/some association between x and y
What are H0 and H1 for a PMCC test?
H0: p = 0
H1: p > 0 or p < 0 or p doesn’t equal 0
When do we reject H0 in SRCC and PMCC tests for POSITIVE correlation/association?
If the test statistic is ABOVE the critical value
When do we reject H0 in SRCC and PMCC tests for NEGATIVE correlation/association?
If the test statistic is BELOW the critical value
What are H0 and H1 for the Chi squared test?
H0: no association between x and y
H1: positive/negative/some association between x and y
When do we reject H0 in the Chi squared test?
When the test statistic is ABOVE the critical value
What are H0 and H1 for the Normal Distribution (z) Test?
H0: u = value
H1: u > value or u < value or u does not equal value
What are the steps for the Normal Distribution (z) test?
H0 and H1
test stat = value of x bar
reject H0 if the p value is ABOVE the critical value
What are H0 and H1 for the Wilcoxon Rank Sum test?
H0: nd = 0
H1: nd > 0 or nd < 0 or nd does not equal 0
What assumption do you make with the Wilcoxon Rank Sum test?
the population is symmetric
What are the steps for the Wilcoxon Rank Sum test?
H0 and H1
Rank data across both sets
Total of ranks for each set
Calculate U values
Test stat = smallest U value
Critical region is anything less than or equal to critical value
Reject H0 if test stat is ABOVE critical value
When do you need to pool data for a Chi squared test?
If any of the EXPECTED values are less than 5
Note
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