October 2012
Beginner
420 pages
9h 37m
English
book
Industrial Statistics with Minitab
by Pere Grima Cintas, Lluis Marco Almagro, Xavier Tort-Martorell Llabres
Content preview from Industrial Statistics with Minitab
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9.3 Normality Test
To apply this test to the data of the detergent's weights presented before, go to: Stat > Basic Statistics > Normality Test
If the data come from a normal distribution, the values of their cumulative proportions will form approximately a straight line on a normal probability plot.
An alternative way to carry out the normality test is the following.
Graph > Probability Plot: Single
Notice that it is possible to fit other distributions. According to the chosen distribution, its parameters may be entered; however, this is optional as by default they are automatically estimated from the data.
If the points lie within the confidence bands, it can be assumed that the values come from the distribution under study using a confidence level of 95%. This level can be changed in tab Data Display, the option which is found next to the Distribution tab.
If only few data are available, which is equivalent to having little information, the hypothesis that the data come ...
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