Central Tendency 1
Central Tendency 2
Percentiles
Box and Whisker Plot
Earlier This Year...
100
Six students from a statistics class reported the number of hours of television they watched per week. Here are their data: 8, 10, 5, 14, 3, 6. What is the mean number of hours of television watched per week for this sample of six students?
7.67
100
The most frequently occurring score in a distribution is the:
Mode
100
If someone scored in the 97th percentile in math on an SAT, what does that mean?
They scored better than or equal to 97% of all test-takers.
100
What numbers are used to create the whiskers for a box and whisker plot?
Maximum & Minimum
100
What is the difference between sample and population data?
Sample data represents only some of the population where population data represents everyone in a given population.
200
A bimodal distribution has _______ modes.
two modes.
200
Sixteen college freshmen were asked to record the number of hours students commute to and from school in a week. Here are their data: 2, 4, 6, 0, 1, 10, 9, 0, 6, 3, 6, 8, 5, 4, 6, 2. What is the mode of this distribution?
6
200
What is a quartile?
A 25% portion of the data.
200
What percentage of data falls in between Q3 and Q1?
50%
200
Define Sampling Error.
Sampling error is the inherent statistical inaccuracies that exist whenever working with sample data.
300
Six students from a statistics class reported the number of hours of television they watched per week. Here are their data: 8, 10, 5, 14, 3, 6. What is the median number of hours of television watched per week for this sample of six students?
7
300
What is "x-bar"? What is the symbol and what does it represent?
Sample mean
300
What is another name for the 25th, 50th, and 75th percentiles?
Q1,Q2,Q3
300
What is the Five Number Summary for a box and whisker plot?
Min, Q1, Median, Q3, Max
300
What is a double-blind study?
A study where both the researcher and participants are unsure if they are in the treatment or control group.
400
Sixteen college freshmen were asked to record the number of hours they spend commuting to and from school per week. Here are their data: 2, 4, 6, 0, 1, 10, 9, 0, 6, 3, 6, 8, 5, 4, 6, 2. What is the median number of hours commuting per week?
4.5
400
When is mode the preferred measure of central tendency?
When working with qualitative data.
400
If there are 100 students in EMK's graduating class and someone finished with a GPA in the 85th percentile, what was their class rank?
15th
400
What is the purpose and usefulness of box and whisker plots?
We use box and whisker plots to compare multiple data sets.
400
Name this distribution type.
Skewed Right.
500
The median is preferred over the mean when _____ are present. Explain
Outliers. The median is resistant to outliers.
500
Here is a data set: 12, 24, 40, 52, 28, x. What would x have to be in order for the mean to be 36.
60
500
Six students from a statistics class reported the number of hours of television they watch per week. Here are their data: 8, 10, 5, 14, 3, 6. If someone in this data set is at the 50th percentile for number of hours watched, how many hours would they have had to watch TV per week?
6 hours
500
Here is a data set: 2, 4, 6, 0, 1, 10, 9, 0, 6. What is the Interquartile Range?
7
Q3-Q1: 7.5-.5
500
Name 3 types of sampling methods and explain each thoroughly.
Multiple answers acceptable.