A researcher is interested in the eating behaviour of 5 year olds and selects a group to be tested in a research study. The group of 25 five year olds is a:
A researcher is curious about the average IQ of registered voters in the state of Florida. The entire group of registered voters in Florida is an example of a:
Although research questions typically concern a ______ research study typically examines a ______.
Statistical methods that use samples to answer general questions bout a population are called _______.
Statistical techniques that summarise, organise and simplify data are classified as ________.
In an experiment, the researcher manipulates the _______ variable and measures changes in the ________ variable.
A researcher observed that preschool children playing in a red room showed more aggression than playing in a blue room. For this study, what is the independent variable?
Colour of the room
Amount of aggression
The children's play
In a study evaluating the effectiveness of a new medication designed to control high blood pressure, one sample of individuals is given the medicine and a second sample is given an inactive placebo. Blood pressure is measured for each individual. For this study, what is the dependent variable?
The individuals given the medication
A hypothesis test is ______.
A descriptive technique that allows researchers to describe a sample
A descriptive technique that allows researchers to describe a population
An inferential technique that uses the data from a sample to draw inferences about a population
An inferential technique that uses information about a population to make predictions about a sample
The null hypothesis _______.
States that the treatment has no effect
Is denoted by the symbol H1
Is always stated in terms of sample statistics
All of the choices are correct
The null hypothesis ______.
Concerns a population with an unknown mean
Is denoted by the symbol H0
Generally states that there is no effect, no change or no difference
All of the other choices are correct
The final step of hypothesis testing is to ______.
Locate the values associated with the critical region
Make a statistical decision about H0
Collect the sample data and compute the test statistic
State the hypotheses and select an alpha level