# Volunteers who had developed a cold within the

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10. Volunteers who had developed a cold within the previous 24 hours were randomized to take either zinc or placebo lozenges every 2 to 3 hours until their cold symptoms were gone. Twenty-eight participants took zinc lozenges, and 23 participants took placebo lozenges. The mean overall duration of symptoms for the zinc lozenge group was 7.2 days, and the standard deviation of overall duration of symptoms was 1.6 days. For the placebo group, the mean overall duration of symptoms was 9 days, and the standard deviation was 1.9 days. Assume each sample comes from a normal distribution. Let sample 1 be for the zinc group and sample 2 be for the placebo group. Find a 95% confidence interval for the difference in mean days of symptoms for the zinc and placebo treatments. Use 27 degrees of freedom. (Be sure not to round until the last step.) A five-number summary for the heights in inches of the women who participated in this survey is as follows. Heights Median 65.7 Quartiles 62 68.4 Extremes 58 75
STA13/Final – Page 3 of 15 – Use this table to answer questions 11 and 12.
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