Vocabulary
The average value of a data set is called this
mean
Probability values must always be between these two numbers
0 and 1
A sample chosen so every member has an equal chance is called
random sample
The normal curve is also known as this type of curve
bell-shaped curve
A variable that is purposely changed in an experiment
Explanatory variable
This measures how spread out data values are around the mean.
Standard deviation
If you flip a fair coin, that is the probability of getting heads?
1/2
Asking only students in AP classes about homework creates this problem.
Bias
In a normal distribution, the mean, median, and mode are all this
equal/the same
The group receiving the treatment is called
treatment group
A graph used to display quantitative data using bars grouped into intervals.
histogram
A die has 6 sides. What is the probability of rolling a 4?
1/6
The entire group being studied is called
population
About 68% of data falls within this many standard devations of the mean.
1 standard deviation
The group not receiving the treatment is called
control group
The middle number in a data set when ordered from least to greatest.
Median
Two events that do not affect each other are called
independent events
A smaller group selected from the population is called
sample
About 95% of data falls within this many standard deviations of the mean
2 standard deviations
Assigning subjects by chance helps reduce this
Bias
A value far away from the rest of the data is called
outlier
If the probability of rain is 0.7, what is the probability it does NOT rain?
0.3
When participants choose whether to respond to a survey, this type of bias may occur.
voluntary response bias
The rule describing 68%, 95%, and 99.7% is called
Empirical Rule
When neither subjects nor researchers know who receives treatment, this experiment is used.
A double-blind experiment