Week one Math 221/ 50 Q&A/ Already Graded
A+
Mode - Answer: the most frequent number appearing in a data set
Mean - Answer: average
empirical rule - Answer: the percentage of data that falls within 1, 2 or 3 standard deviations of
the mean in a symmetrical bell-shaped distribution
standard deviation - Answer: the square root of the variance
Standard score - Answer: show how the particular data point is from the mean in the terms of
the number of standard deviations
The hair color of the players on a tennis team would be considered: - Answer: Nominal data
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, In a survey of 1000 adults, 34% found they prefer charcoal to gas grills. The 1000 would be
considered a: - Answer: Sample
The age of every fourth person entering a department store. The selected individuals would be
considered a: - Answer: Sample
Sixteen students are randomly selected from each grade level at a high school and asked about
their eating habits. This sampling technique is called: - Answer: Stratified
The difference between cluster sampling and stratified sampling would be: - Answer: Each
divides the population into groups. Stratified sampling uses some in each group while cluster
uses all in selected groups.
If data set A has a larger mean than data set B, what would be different about their
distributions? - Answer: The distribution of data set A would generally be to the right of the
distribution of data set B
Inferential statistics is when sample data is used to: - Answer: Say something about the
population
- Answer: Interval data
The compensation of all college graduates would be considered: - Answer: Ratio data
Every fifth person boarding a plane is asked additional security questions. This sampling
technique is called: - Answer: Systematic
Cameras are set up to watch an intersection and determine how many cars are let through with
each green light interval. This study design would be considered: - Answer: Observational
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A+
Mode - Answer: the most frequent number appearing in a data set
Mean - Answer: average
empirical rule - Answer: the percentage of data that falls within 1, 2 or 3 standard deviations of
the mean in a symmetrical bell-shaped distribution
standard deviation - Answer: the square root of the variance
Standard score - Answer: show how the particular data point is from the mean in the terms of
the number of standard deviations
The hair color of the players on a tennis team would be considered: - Answer: Nominal data
Page 1 of 6
, In a survey of 1000 adults, 34% found they prefer charcoal to gas grills. The 1000 would be
considered a: - Answer: Sample
The age of every fourth person entering a department store. The selected individuals would be
considered a: - Answer: Sample
Sixteen students are randomly selected from each grade level at a high school and asked about
their eating habits. This sampling technique is called: - Answer: Stratified
The difference between cluster sampling and stratified sampling would be: - Answer: Each
divides the population into groups. Stratified sampling uses some in each group while cluster
uses all in selected groups.
If data set A has a larger mean than data set B, what would be different about their
distributions? - Answer: The distribution of data set A would generally be to the right of the
distribution of data set B
Inferential statistics is when sample data is used to: - Answer: Say something about the
population
- Answer: Interval data
The compensation of all college graduates would be considered: - Answer: Ratio data
Every fifth person boarding a plane is asked additional security questions. This sampling
technique is called: - Answer: Systematic
Cameras are set up to watch an intersection and determine how many cars are let through with
each green light interval. This study design would be considered: - Answer: Observational
Page 2 of 6
