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Calculate the mean and standard deviation of actual sales.
Line number Month (Period ) Actual Forecast x - ? (x - ?)* (x - ?)
10 January (1) 11.10 11.90 -3.43 11.79
20 February (2) 13.90 12.60 -0.63 0.40
30 March (3) 16.00 14.30 1.47 2.15
40 April (4) 13.70 14.90 -0.83 0.69
50 May (5) 14.30 17.50 -0.23 0.05
60 June (6) 18.20 13.70 3.67 13.44
July (7)
70 Total 87.20
80 Number of periods 6.00
90 Mean (?=Line 70/Line 90) 14.53
100 Sum of square deviations 28.53
110 Variance (?2=? ((x - ?)*(x - ?))/(6-1)) 5.71
120 Standard deviation (?=SQRT (? ((x - ?)*(x - ?))/(6-1)) 2.39
2. What is the correlation for this data set? Hint: think about what you are correlating...
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