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.

  1. __________ What is the level of measurement for the data?
  2. __________ Find the sample size n.
  3. __________ Find the minimum.
  4. __________ Find the maximum.
  5. __________ Find the range.
  6. __________ Find the midrange.
  7. __________ Find the mode.
  8. __________ Find the median.
  9. __________ Find the sample mean x.
  10. __________ Find the sample standard deviation sx.
  11. __________ Find the sample coefficient of variation CV.
  12. __________ If this data is to be divided into six classes, what is the width of a single class?
  13. Determine the frequency and calculate the relative frequency using six classes. Record your results in the table provided.
Bin upper limitsFrequency FRelative Frequency
Sums:
  1. Sketch a relative frequency histogram of the data, labeling your horizontal axis and vertical axis as appropriate. Use the back if you prefer.
  2. ______________________________ What is the shape of the histogram?
  3. 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.
  4. _________________ Would 402 friends be an ordinary value OR an extraordinary value for a Bebo user?