# Statsdraft - Question 1 Frequencies Statistics Hours N Mean Median Mode Std Deviation Variance Valid Missing 53 0 4.464 4.400 4.7(a.9305.866 a

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Question 1) Frequencies Statistics Hours N Valid 53 Missing 0 Mean 4.464 Median 4.400 Mode 4.7(a) Std. Deviation .9305 Variance .866 a Multiple modes exist. The smallest value is shown Hours Frequency Percent Valid Percent Cumulative Percent Valid 2.8 2 3.8 3.8 3.8 3.1 2 3.8 3.8 7.5 3.2 1 1.9 1.9 9.4 3.4 2 3.8 3.8 13.2 3.5 1 1.9 1.9 15.1 3.6 3 5.7 5.7 20.8 3.6 1 1.9 1.9 22.6 3.7 2 3.8 3.8 26.4 3.8 1 1.9 1.9 28.3 3.9 3 5.7 5.7 34.0 4.1 3 5.7 5.7 39.6 4.2 2 3.8 3.8 43.4 4.3 2 3.8 3.8 47.2 4.4 2 3.8 3.8 50.9 4.5 3 5.7 5.7 56.6 4.6 1 1.9 1.9 58.5 4.7 5 9.4 9.4 67.9 4.8 1 1.9 1.9 69.8 4.9 1 1.9 1.9 71.7 5.1 2 3.8 3.8 75.5 5.3 5 9.4 9.4 84.9 5.4 1 1.9 1.9 86.8 5.6 1 1.9 1.9 88.7 5.7 1 1.9 1.9 90.6 5.8 1 1.9 1.9 92.5 6.1 1 1.9 1.9 94.3 6.2 1 1.9 1.9 96.2 6.4 1 1.9 1.9 98.1

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6.7 1 1.9 1.9 100.0 Total 53 100.0 100.0 Hours 7.0 6.0 5.0 4.0 3.0 2.0 Frequency 8 6 4 2 0 Histogram Mean =4.46 Std. Dev. =0.93 N =53 Report Hours Level Mean N Std. Deviation Variance Exec 5.150 26 .7301 .533 Mgr 3.804 27 .5438 .296 Total 4.464 53 .9305 .866
We observed that the mean hours used on email per staff is 4.464. At least half of the staff will use 4.464 hours. The most number of staff will use 4.7 hours or 5.3 hours. The minimum number of hours used are 2.8 hours and the maximum number of hours used are 6.7 hours. The median 4.400 hours is quite near the mean 4.464 hours. This indicates the distribution is symmetrical. The standard deviation for hours spent on email is 0.9305. This indicates a fairly wide variability in time used across levels. This variability is quite a bit smaller for the executive level with difference in standard deviation of 0.2004 (0.9305-0.7301). Question 2a) T-Test One-Sample Statistics N Mean Std. Deviation Std. Error Mean Hours 53 4.464 .9305 .1278 One-Sample Test Test Value = 0 t df Sig. (2-tailed) Mean Difference 95% Confidence Interval of the Difference Lower Upper Hours 34.927 52 .000 4.4642 4.208 4.721 The confidence limits are 4.208 and 4.721. The two figures are a range of values constructed so that the time used on email usage is likely to occur within that range at a 95% level of confidence.

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## This note was uploaded on 02/12/2012 for the course PHYSICS 321 taught by Professor M during the Spring '11 term at Jordan University of Science & Tech.

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Statsdraft - Question 1 Frequencies Statistics Hours N Mean Median Mode Std Deviation Variance Valid Missing 53 0 4.464 4.400 4.7(a.9305.866 a

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