<p>8.18. Twenty-two percent of Gallup respondents indicated suspicion of steriod

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<p>8.18. Twenty-two percent of Gallup respondents indicated suspicion of steriod use by athelets who broke world records in swimming. Calculate an interval estimate using a margin of error at 3.5%<br />8.20. For each of the following confidence intervals, indicate how much of the distributions would be placed in the cutoff for a two-tailed test: (a) 80% (b) 85% (c) 99%.<br />8.26. For a given variable, imagine we know that the population mean is 1014 and the standard deviation is 136. A mean of 1057 is obtained based on sampling. Calculate the z test statistic for this mean, assuming it was found using each of the following sample sizes: (a) 12 (b) 39 (c) 188.</p>
<p>8.28 Calculate the effect size for each of the following average SAT math scores. Remember, SAT math is standardardized &#181; = 500 and &#963; = 100. (a) 61 people sampled have amean of 480 (b) 82 people samples have amean of 520 (c) 6 people sampled have amean of 610.</p>

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