STAB22H3 Lecture Notes - Lecture 12: Sign Test, Yogurt, Null Hypothesis
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In a metropolitan area, the concentration of cadmium (cd) in leaf lettuce was measured in 6 representative gardens where sewage sludge was used as fertilizer. The following measurements (in mg/kg of dry weight) were obtained. Is there strong evidence that the mean concentration of cd is higher than 12. Variable n mean median trmean stdev se mean. 1. 38 degrees of freedom = 6 1 = 5 t = 1. 38 < 2. 015, not sig. at the 5% level and so no strong evidence. Give a 95% ci for the mean cd concentration. x t. 60 a a random sample of 9 observations (normally distributed) is obtained, yielding value of the test for this sample? x= and s = 5. 55: greater than 0. 10, between 0. 05 and 0. 10, between 0. 025 and 0. 05, between 0. 01 and 0. 025, less than 0. 01. Ans: t = -3 p is between 0. 005x2 and 0. 01x2 i. e. between 0. 01 and 0. 02 and so d) the answer.
