STAB22H3 Lecture Notes - Confidence Interval, Unimodality, True Value
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STAB22H3 Full Course Notes
Verified Note
38 documents
Document Summary
When have to make decision based on data, use hypo test. For mean of qvar main text, p617. What - time it takes to get to school. Want to get a feel as to what is avg time it takes for all ontario students to get to school. N = 40 ontario 2ndry school students, srs. How does data regarding means differ from proportions. *impt way: prop"s typically reported as summaries. Qdata typically reports numerical val. for each subj. Regardless of what popn the random sample is retrieved from, shpape of sampling distrib approx. Larger the n more closely that normal approximates sampling distrib of mean. This formula req. that we know true popn sd (sigma) p619. Req. that to model smapling distrib. of mean from random sample of qdata, need true popn sd. For means, knowing about sample mean does not tell us ath about standard deviation of mean. Know n , but sigma couild be ath.
