i need help with stats

7. [0/8 Points] ASK YOUR TEACHER PRACTICE ANOTHER 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-ve participants took zinc lozenges, and 23 participants took placebo lozenges. The mean overall duration of symptoms for the zinc lozenge group was 3.5 days, and the standard deviation of overall duration of symptoms was 1.3 days. For the placebo group, the mean overall duration of symptoms was 8.4 days, and the standard deviation was 2 days. (a) Calculate a 95% condence interval for the mean overall duration of symptoms if everyone in the population were to take the zinc lozenges. (Round your answers to two decimal places.) 1.8 X to 1.8 X days to days (b) Calculate a 95% condence interval for the mean overall duration of symptoms if everyone in the population were to take the placebo lozenges. (Round your answers to two decimal places.) (c) On the basis of the intervals computed in parts (a) and (b), is it reasonable to conclude generally that taking zinc lozenges reduces the overall duration of cold symptoms more than if taking a placebo? Explain why you think this is or is not an appropriate conclusion. population of cold sufferers the mean duration of symptoms if zinc lozenges are taken is Select--v Seleot--- v reasonable to conclude that taking zlnc lozenges reduces the duration of symptoms. The confidence Intervals computed In parts (a) and (b) than the mean duration if placebo is taken. -Select v , so a reasonable conclusion Is that In a (d) In their paper, the researchers say that they checked whether it was reasonable to assume that the data were sampled from a normal curve population and decided that it was. How is this relevant to the calculations done In pars (a) and (b)? For relatively ~-Select- V samples such as these, a necessary condition (in theory) is that the population of measurements has a normal distribution. You may need to use the appropriate table in the Appendix of Tables to answer this question, Need Help? _ B. [315 Points] UHSTATS 11.E.029. ASKYOURTEACHER PRACTICE ANOTHER B. [3/5 Points] PREVIOUS ANSWERS UHSTATS 11.E.029. ASK VOUR TEACHER PRACTICE ANOTHER Each man in a random sample ofn = 16 men between 30 and 39 years old is asked to do as many sit-ups as they can in one minute. The mean number is 7 = 27.2, and the standard deviation of the number of sit-ups is s = 8. (a) Find the value of the standard error of the sample mean. 2 J Write a sentence that interprets this value. This is the average difference between the sample and population means over all random samples that can be selected from this sample. This Is the maximum difference between the sample and population means over all random samples ofn = 16 that can be selected from this sample. This is the maximum difference between the sample and population means over all random samples that can be selected from this sample. O This is the average difference between the sample and population means over all random samples of n = 16 that can be selected from this sample. I (b) Find a 95% confidence Interval for the population mean. (Round your answers to one decimal place.) 233 x to 31.1 x sit-ups (c) Write a sentence that interprets the condence interval in the context of this situation, With 95% condence, we can estimate that in the population of men represented by this sample that every individual's number of sit-ups is contained within the interval. With 95% condence, we can estimate that in the population of men represented by this sample that the maximum number of sit-ups is contained within the interval. C) With 95% condence, we can estimate that In the population of men represented by this sample that the mean number of sit-ups Is contained within the Interval. With 95% condence, we can estimate that in the population of men represented by this sample that the minimum number of sit-ups is contained within the interval. \\/ You may need to use the appropriate table in the Appendix of Tables to answer this question. Need Help