The following summary statistics were obtained from a data set. Approximately what proportion of the observations are:
Question:
The following summary statistics were obtained from a data set.
Approximately what proportion of the observations are:
(a) Below 96.0?
(b) Above 84.0?
(c) In the interval 59.5 to 101.5?
(d) In the interval 75.5 to 96.0?
(e) In the interval 49.0 to 112.0?
State which of your answers are based on the assumption of a bell-shaped distribution.
(250, 850] 6 (850, 1650] 5 (1650, 2450] 3 Total 39
(a) Calculate the relative frequency for the intervals.
(b) Plot the relative frequency histogram.
(Hint: Since the intervals have unequal widths, make the height of each rectangle equal to the relative frequency divided by the width of the interval.)
(c) What proportion of the changes were negative?
(d) Comment on the location and shape of the distribution.
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