A) Construct the 95% confidence interval for the difference in means. The means and pooled standard error are below. B) Does it include zero?
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- What is meant by the sample space of an experiment?Both students with the rural and urban background in a college music appreciation course are given an aptitude test on the first day of class. Make any necessary assumptions and construct a 99% confidence interval for the difference in music attitude if the summary of the experiment is as follows: type sample size average apitude score standard deviation Rural 9 71.4 4.1 Urban 14 86.2 3.8 A. (-18.41, -11.19) B. ( -19.54, -10.06) C. ( -18.28, -11.32) D. (-19.19, -10.41)The proportions of defective parts produced by two machines were compared, and the following data were collected. Determine a 90% confidence interval for p1 - p2. (Give your answers correct to three decimal places.) Machine 1: n = 152; number of defective parts = 17 Machine 2: n = 140; number of defective parts = 10 Lower Limit Upper Limit
- Consider the following results for two independent random samples taken from two populations. Sample 1 Sample 2 n1=50 n1=30 xbar1=13.6 xbar=11.1 pop mean 2.1 pop mean=3 What is the point estimate of the difference between the two population means? (to 1 decimal) Provide a confidence interval for the difference between the two population means (to 2 decimals).( , ) Provide a confidence interval for the difference between the two population means (to 2 decimals).( , )Out of 67,410 surgeries tracked in a study in the U.K., 2832 were followed by surgical site infections (Coello et al. 2005). a. What is a 95% confidence interval for the proportion of surgeries followed by surgical site infection in the U.K.? b. Assume that the data are a random sample.If the study had followed a total of only 674 surgeries from the same population, would the confidence interval have been wider or narrower?A researcher surveys 50 individuals in Smithville and 40 in Amherst, finding that 30% of smithville residents moved last year, while only 22% of Amherst residents did. Is there enough evidence to conclude that mobility rates in the two communities differ? Use a two-tailored alternative, and a=0.10. Again, find the p-value and a 90% confidence interval for the difference in proportions