STAT 245 Study Guide - Final Guide: Null Hypothesis, F-Test, Central Limit Theorem
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It is claimed that the mean weight of women at a u. s. college is 54. 4 kg. Professor hart disputes this claim, and will conduct a study to that end: his null hypothesis is. : 54. 4: is known to be 5. 4 kg. Assume that the distribution of weights is normal. He will use a significance level of =0. 05. He collects a random sample of 400 weights: the sample mean is 53. 75 kg. = -0. 65/0. 54 = -2. 407407: look up the critical value zcr it or determine the p -value. Use a z table, or the bottom row of a t table. A: yes: conclusion: our evidence supports rejection of h0 . The mean weight of the college women is significantly different from 54. 4. ex t001c. What if x = 53. 15, and everything else is the same as original? zo b s = (53. 15 - 54. 4) / (5. 4 / 100 ) = -1. 25/0. 54 = -2. 314815.
