Experimental Design
What I measure at the end of an experiment is called the
Response Variable
This type of sampling is where I choose the people that are easiest to access to survey, often leading to biased results.
Convenience Sampling
What is experimental probability?
Probability calculated by performing an experiment and recording results
On a standardized exam, the scores are normally distributed with a mean of 28 and a standard deviation of 4. Find the z-score of a person who scored 34 on the exam.
z = 1.5
What describes the MODE in a data set
The number/value that appears the most
This can also be called the "Factor." This is what you are doing to the subjects in an experiment.
Explanatory Variable
This type of sampling is when you go through a list and choose every nth person.
Systematic Sampling
What is theoretical probability?
Probability based on the possible outcomes in theory
On a standardized exam, the scores are normally distributed with a mean of 300 and a standard deviation of 50. Find the z-score of a person who scored 200 on the exam.
z = -2
What describes the MEDIAN of a data set?
The number/value in the middle
In an experiment, this is when the subject is given a fake treatment like a sugar pill or saline nasal spray.
Placebo
This is a group in an experiment that does not get a treatment.
Control Group
Jacob had a six-sided number cube. Each side was labeled with one number, from 1 to 6. What is the probability Jacob rolls a four?
1/6
On a standardized exam, the scores are normally distributed with a mean of 750 and a standard deviation of 20. Find the z-score of a person who scored 755 on the exam.
z = 0.25
What describes the MEAN in a data set?
The average of all values
When I hand out a survey about exercise to people leaving the gym, I am conducting an
Observational Study
This is a type of sample where every GROUP of size n has the same chance of being selected. We typically use our random number table to choose these types of samples
Simple Random Sampling
A bag contains 12 blue marbles, 8 red marbles, and 5 green marbles. You draw a marble, record its color, and place it back in the bag 100 times. You pull a red marble 34 times. What is the experimental probability of drawing a red marble?
34/100 or 34%
For males in a certain town, the systolic blood pressure is normally distributed with a mean of 130 and a standard deviation of 6. What percentage of males in the town that have a systolic blood pressure between 126 and 137, to the nearest tenth?
≈62.6%
Find the Mean and Median of the data set:
30,21,0,40,15,26,36
Median: 26
Mean: 24
When I deliberately impose a treatment on subjects or experimental Units, I am conducting an
Experiment
This type of sampling is when I divide my population into groups and choose one or more groups. I sample every single person in the chosen groups.
Cluster Sampling
You flip a coin 50 times. It lands on heads 22 times. What is the experimental probability of landing on heads?
22/50 or 44%
IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. What percentage of people have an IQ score between 102 and 125, to the nearest tenth?
≈39.9%
Find the Median and Mean of the data set:
46,16,36,43,13,49,0
Median: 36
Mean: 29