19.24.26.27

19.24.26.27 - Chapter1 9 4. yliveelsewhere Notagood...

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4. The people with college degrees probably live elsewhere.  Not a good   sampling scheme. 5. Estimate is probably too high. With smaller households,  the   interviewer is less likely to find anyone at home. 6. No. Different sorts of students are more/less likely to  walk   through different parts of the campus at different times.  Chances are   hard to figure out. 12a. Only the high achievers are listed in the sampling  frame. 12b. A lot of room for bias here. 10.  Look at figure 3, ch. 18. The likeliest number of heads  is 50.   Pick that first. Next two picks should be 49 and 51. Then 48  and 52.   And so forth. You should pick 45 - 55, chance of winning is  73% 11a. 10-30 11b. 40-50 11c. To get the center of hte range, take 50 from the sum,  and then go   5 either way. 11d. 73%
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19.24.26.27 - Chapter1 9 4. yliveelsewhere Notagood...

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