MS 150 Statistics spring 2010 test one: Will you be(bo) my friend? • Name:
The data is the number of friends reported by Bebo users.
__________ What is the level of measurement for the data?
__________ Find the sample size n.
__________ Find the minimum.
__________ Find the maximum.
__________ Find the range.
__________ Find the midrange.
__________ Find the mode.
__________ Find the median.
__________ Find the sample mean x.
__________ Find the sample standard deviation sx.
__________ Find the sample coefficient of variation CV.
__________ If this data is to be divided into six classes, what is the width of a single class?
Determine the frequency and calculate the relative frequency using six classes. Record your results in the table provided.
Bin upper limits
Sketch a relative frequency histogram of the data, labeling your horizontal axis and vertical axis as appropriate. Use the back if you prefer.
______________________________ What is the shape of the histogram?
z = __________ The largest number of friends for a FaceBook user is 402 friends. Calculate a z-score for 402 friends using the mean number of Bebo friends and the standard deviation for the number of Bebo friends calculated above.
_________________ Would 402 friends be an ordinary value OR an extraordinary value for a Bebo user?