Data analysis Part 7: F test
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Data analysis Part 7: F test To perform t test, it is important to know whether the variances of the two samples are equal or not This test is called F test. Let us take two sets of data as follows (Actual weight of paracetamol tablets that are marketed as 500mg) and perform F test Batch1 Batch2 499.643 500.240 499.475 501.055 500.459 500.120 499.692 500.680 497.946 500.478 500.280 500.157 500.072 499.961 500.054 500.833 499.619 501.052 500.761 499.996 499.251 499.264 500.808 499.221 500.224 500.384 500.083 500.999 500.747 499.507 498.547 500.690 501.282 499.731 499.672 499.934 499.086 497.957 499.600 499.131 500.828 499.257 501.772 502.237 499.615 498.184 500.491 500.381 499.105 501.112 F Test Two Sample for Variances Batch 1 Batch 2 Mean 499.965 500.102 Variance 0.725 0.904 Observations 25 25 df 24 24 F 0.802 P(F<=f) one-tail 0.297 F Critical one-tail 0.504 if F > F Critical one-tail, we...
