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Statistics

written by: mattbeckwith
 
This is a quiz on elementary concepts of statistics.

Question 1:


Let's say that a statistical analysis of the people of the United States shows that Texans are on average taller, and that Texans also are on average richer. What conclusion can one draw from this result?
There might or might not be a relationship between being tall and being rich.
Being tall leads to being rich.
If you want to be rich, you should move to Texas.
Being rich leads to being tall.

Question 2:


Let's say you're conducting a study to see whether a new experimental medication will cause bald men to grow hair. You divide your patients into 2 groups. To one group you give the medication. To the other group, you give a placebo. In this study, the correct terms for the taking of the medication and the growth of hair are the following.
Both the medication and the hair growth are dependent variables.
The medication is the dependent variable, and the hair growth is the independent variable.
Both the medication and the hair growth are independent variables.
The medication is the independent variable, and the hair growth is the dependent variable.

Question 3:


Let's say you're conducting a survey of the people of the United States to find out how popular the president is. You randomly choose people to call, and make 1,000 phone calls to people scattered across the country. In this study, what is the statistics term for THE PEOPLE IN THE U.S., and what is the statistics term for THE PEOPLE YOU CALLED?
The people of the U.S. are the SAMPLE, and the people you called are the POPULATION.
Both the people of the U.S. and the people you called are POPULATIONS.
The people of the U.S. are the POPULATION, and the people you called are the SAMPLE.
Both the people of the U.S. and the people you called are SAMPLES.

Question 4:


Let's say you want to know whether a medication is effective for curing the common cold. You take 1,000 people with colds, and divide them into 2 groups of 500. You give the medication to one group, and placebo to the other group. To make this a DOUBLE-BLIND study, what would you have to do?
Conceal from both the patients and the experimenters which pills are medication and which pills are placebo.
Put blindfolds on the 500 people who get the medication.
Don't tell the administrators of the experiment whether they're giving out medication or placebo.
Don't tell the patients of either group whether they're getting medication or placebo.

Question 5:


Statistics is useless, since you can design an experiment to statistically prove anything you want to prove.
False
True

Question 6:


What does the sentence, "Correlation does not imply causation.", mean?
The fact that one phenomenon causes another phenomenon does not mean that they are correlated.
Two wrongs don't make a right.
None of these
The fact that 2 phenomena are correlated does not mean that one of them causes the other.

Question 7:


Which of the following definitions is the definition of the MODE?
The MODE is the largest value.
The MODE is the average calculated by adding up all the values and dividing by the number of entries.
The MODE is the value that has the highest frequency.
The MODE is the value that half of the entries are below and half of the entries are above.

Question 8:


Which of the following definitions is the definition of the MEAN?
The MEAN is the value that has the highest frequency.
The MEAN is the largest value.
The MEAN is the value that half of the entries are below and half of the entries are above.
The MEAN is the average calculated by adding up all the values and dividing by the number of entries.

Question 9:


Which of the following definitions is the definition of the MEDIAN?
The MEDIAN is the average calculated by adding up all the values and dividing by the number of entries.
The MEDIAN is the value that half of the entries are below and half of the entries are above.
The MEDIAN is the largest value.
The MEDIAN is the value that has the highest frequency.

Question 10:


What is a normal curve?
A woman with an hour-glass figure has a NORMAL CURVE.
If the frequency of occurrence of something is clustered around the mean, and its graph is bell-shaped, then this is a NORMAL CURVE.
If an average, mentally healthy individual draws an arc, then the pattern formed is termed a NORMAL CURVE.
On a race track, if the turning radius of a gradual turn exceeds pi/2, then this is a NORMAL CURVE.

 


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