Statistics Flashcards
Name the three types of data distributions
Normal, binominal & poisson
Describe normal distribution
Single peak (unimodal)
Symmetrical
Same mode, median & mean
Described by mean and standard deviation
What are the two tests that assess normality?
Shapiro-Wilk
Kolmogorov-Smirnov
What is variance?
The average amount by which a measurement differs from the mean
Describe standard deviation
Describes the scatter or spread in a sample
What is the coefficient of variation useful for?
Determining the reliability of repeated measurements
What is a confidence interval?
The probability that the true population mean lies between a specific range of values
What is the standard error of the mean?
A way of determining how close a sample mean is to the population mean
What is binominal distribution?
Used for counts of data on a dichotomous scale
What is poisson distribution?
Used for counting the number of events occurring over a period of time
What is a null hypothesis?
Where there is no significant difference between two variables in the hypothesis
What value is used to support or reject a null hypothesis?
p Value
What is the relationship between the p value & null hypothesis?
The smaller the p value, the higher the probability of a true difference between the two groups
When would a null hypothesis be rejected?
p-Value < 0.05
Define Type 1 & Type 2 errors
Type 1 - H0 wrongly rejected
Type 2 - H0 wrongly accepted
