(Solved): nean overall duration of symptoms for the zinc lozenge group was x2=4.4 days, and the standard ...

nean overall duration of symptoms for the zinc lozenge group was ${\bar{x}}_2=4.4$ days, and the standard deviation of overall duration of symptoms was 1.5 days. (a) Calculate ${\bar{x}}_1-{\bar{x}}_2$ difference in sample means. ${\bar{x}}_1-{\bar{x}}_2=$ $\mathbf{x}$ days Compute the unpooled s.e. $\left({\bar{x}}_1-{\bar{x}}_2\right)$ standard error of the difference in means. (Round your answer to four decimal places.) $\text{ s.e. }\left({\bar{x}}_1-{\bar{x}}_2\right)=\text{ days }$ of $n_1-1$ and $n_2-1$ as a conservative estimate of degrees of freedom. (Round the answers to two decimal places.) to days (c) Complete the following sentence interpreting the interval which was obtained in part (b). With $95\%$ confidence, we can say that in the population of cold sufferers represented by the sample, taking zinc lozenges would symptoms by somewhere between and days, compared with taking a placebo. I. the mean number of days of (d) Is the interval computed in part (b) evidence that the population means are different? Fill the blank in the following sentence. I evidence that population means are different because it 0 . Zinc lozenges to be effective in reducing the average number of days of symptoms.