Flashcards in Key words Deck (18)
What are type 1 errors?
False positive findings
A Type 1 error is the incorrect rejection of a true null hypothesis.
What are type 2 errors?
False negative findings
A Type 2 error is the failure to reject a false null hypothesis.
What are descriptive statistics?
Descriptive statistics are used to describe the basic features of the data in a study. They provide simple summaries about the sample and the measures.
What are inferential statistics?
Inferential statistics allows you to make predictions from that data. With inferential statistics, you take data from samples and make generalisations about a population.
What does statistical power describe?
A measure of the ability of a statistical procedure to detect a true difference.
Define the term 'significance level'
The probability of falsely rejecting a true null hypothesis when repeatedly using a specific hypothesis test on different samples.
Describe ordinal variables
An ordinal variable is a categorical variable for which the possible values are ordered, like educational level
Describe nominal variables
Nominal variables have two or more categories without having any kind of natural order. They are variables with no numeric value, such as occupation or political party affiliation.
Describe binary variables
A variable that can only take on two values, usually 0/1. Could also be yes/no, tall/short or some other two-variable combination.
What are discrete variables?
Variables that can only take on a finite number of values are called discrete variables, like how many cars are parked in a car park
What are continuous variables?
A variable with infinite number of values, like time or weight
What's the difference between quantitative and qualitative variables?
Qualitative variable: a broad category for any variable that can’t be counted (i.e. has no numerical value).
Quantitative variable: A broad category that includes any variable that can be counted, or has a numerical value associated with it.
Define the term 'null hypothesis'
It's the starting assumption that there is no difference between the two variables that are being studied
What is meant by the term health?
A state of complete physical, mental and social well-being and not merely the absence of disease or infirmity
The science & art of preventing disease, prolonging life, promoting health & efficiency through organised community effort
What's meant by a 1% solution?
There's 1g of the drug per 100ml of solution
What's meant by a 5% solution?
There's 5g of the drug per 100ml of solution