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
A researcher obtained a random sample of 100 smokers and a random sample of 100 non-
smokers. After interviewing all 200 participants, the researcher compared the rates of
depression between the two groups. This study design would be considered: - Answer:
Experimental
Page 1 of 6
, What is the relationship between variance and standard deviation? - Answer: Standard
deviation is the square root of the variance
In manufacturing, convenience sampling could be used to determine if the machines are
operating correctly. Which of the following best describes this type of sampling? - Answer:
Samples are randomly selected throughout the day
A graph shows a line connecting the tops of vertical bars with the number of data points on the
y-axis and groups on the x-axis. This graphic is most likely to be: - Answer: A frequency polygon
The final grades for students in a statistics class would be considered: - Answer: Ordinal data
The ages of 20 first graders would be considered: - Answer: Quantitative data
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
What is the relationship between variance and standard deviation? - Answer: Variance is the
square of the standard deviation
Page 2 of 6
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
A researcher obtained a random sample of 100 smokers and a random sample of 100 non-
smokers. After interviewing all 200 participants, the researcher compared the rates of
depression between the two groups. This study design would be considered: - Answer:
Experimental
Page 1 of 6
, What is the relationship between variance and standard deviation? - Answer: Standard
deviation is the square root of the variance
In manufacturing, convenience sampling could be used to determine if the machines are
operating correctly. Which of the following best describes this type of sampling? - Answer:
Samples are randomly selected throughout the day
A graph shows a line connecting the tops of vertical bars with the number of data points on the
y-axis and groups on the x-axis. This graphic is most likely to be: - Answer: A frequency polygon
The final grades for students in a statistics class would be considered: - Answer: Ordinal data
The ages of 20 first graders would be considered: - Answer: Quantitative data
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
What is the relationship between variance and standard deviation? - Answer: Variance is the
square of the standard deviation
Page 2 of 6
