A random sample drawn from two places gave the following table relating to the height of 100 mm. Mean height, Place A 68.60, Place B 68.68. Standard deviation of height, Place A 2.5, Place B 3.0. Sample size, Place A 1200, Place B 1500. Test at 5% level that the mean height is the same for adult in the two places. Table value of Z at 5% level for two-tailed test is 1.96.
