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Unformatted text preview: A z test is applicable if the data satisfies the following conditions: (a) The data points should be independent of each other (b) The sample size, n > 30 (c) If n < 30, the distribution should be normal. (If n > 30 the distribution of the data does not matter) (d) Random sampling A t test is applicable if the data satisfies the following conditions: (a) The data sets should be independent from each other except in the case of the pairedsample t test (b) If n < 30 the use of t test is mandatory (c) The distributions should be normal for the equal and unequal variance ttest (d) Random sampling (C) Based on the analysis of a small sample we infer about population parameters and take an appropriate decision regarding the population. A scientifically selected sample reduces the cost of the entire analysis and saves time without compromising on the accuracy of the estimates....
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 Spring '10
 

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