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A study was done by randomly assigning 200 volunteers with sore throats to either drink a cup of herbal tea or use a throat lozenge to ease their pain.
The percentages reporting relief for the two methods were compared. What are the research question, the population parameter, and the sample estimate for this study?
Determine the first, second, and third quartiles for the data in given Exercise; then calculate the interquartile range and the quartile deviation
Explain how to test the hypothesis of no differences in the mean proportions of mouth fixations for the four background noise levels.
Explain why this is an observational study, not a randomized experiment.- What were the explanatory and response variables of interest to the researchers?
How many citizens would need to be sampled if a 99% confidence interval was desired to estimate the true proportion to within 1%?
Problem: Three sets of measurement are in the table below.
assume that womens heights are normally distrubted with a mean 62.4 inches and a sd given by 2.6 inch.a. if a woman is
What are the implications of forecast errors?
the proportions of blood phenotypes a b ab and o in the population of all caucasians in the united states are .41 .10
The average efficiency of the sample is calculated to be 91.0% and the standard deviation of the sample is 0.8%. If we want to cut the confidence interval by one-half, how many more motors should be tested?
An industrial engineer at Lyons Products would like to determine whether there are more units produced on the afternoon shift than on the morning shift.
In a research study, what does statistically significant mean? How are decisions made on data based on significance? What do you do with data that is not significantly different?
Does this data provide evidence at the .05 significance level that there is a difference in the proportion of humorous ads in British versus American trade magazines? Please show work.
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