MS 150 Statistics spring 2010 test one: Will you be(bo) my friend? • Name:

Bebo

59

73

89

100

120

142

156

200

244

281

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

Frequency F

Relative Frequency

Sums:

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?