In a survey of 813 human resource professionals concerning challenges they faced in the workplace, 321 said that employee retention was an important challenge and 194 said that employee satisfaction was an important challenge.  the 95% confidence interval estimate for the population proportion is

What happens to the width of a confidence interval as the significance level, a, decreases?

41. There is an ever increasing number of sources of getting the daily news – traditional newspapers, online, radio, nightly television newscasts, comedy shows, cellphones, podcasts, etc. In a recent telephone survey, 3204 randomly selected adult were asked to cite their primary source of daily news. Four in 10 adults said that they read a newspaper, either in print or online, almost everyday. A 98% confidence interval to estimate the true proportion of adults who would read either a print newspaper or its online equivalent for their daily news is given by (0.38, 0.42). Which of the following is a correct interpretation of the confidence level? There is a 98% chance that the true proportion of readers who would read either a print newspaper or its online equivalent for their daily news is in the interval (0.38, 0.42). Ninety-eight percent of all samples of this size would only yield a confidence interval of (0.38, 0.42). There is 98% chance that a randomly selected is one of the 40%…

According to a Field Poll, 79% of California adults (actual results are 400 out of 506 surveyed) feel that "education in our schools" is one of the top issues facing California.  We wish to construct a 90% confidence interval for the true population proportion of California adults who feel education and the schools is one of the top issues facing California.  A point estimate for the true population proportion is: choices given listed below 1.27 .79 506 ,90 .05 .10 400

A travel magazine is studying the difference in perceived quality of Middle Eastern and US airlines. A sample of 17 passengers who had flown Emirates and 20 passengers who had flown Delta, were asked to rate their overall satisfaction on a 7-point scale. The average quality ratings obtained were 5.353 for Emirates and 3.882 for Delta. The sample variance for quality ratings was found to be 2.743 for Emirates and 2.985 for Delta. Construct a 96% confidence interval for the difference in average satisfaction rating between all passengers who have flown Emirates and all passengers who have flown Delta. Based on this confidence interval, and a 4% significance level, can you conclude that there is a difference in the average quality ratings for Emirates and Delta airlines?

A second-semester junior at a large high school wants to estimate the number of colleges a senior applies to on average before deciding which school they will attend. The junior randomly selects 18 seniors and asks them how many colleges they applied to and records the number. A 99% confidence interval is calculated to estimate the true mean number of colleges seniors at this school apply to before deciding which college to attend. Check all the true statements that apply. Reducing the confidence level will reduce the margin of error. Increasing the sample size will reduce the margin of error. Increasing the sample size will cost this junior too much money. The junior can lower the standard deviation and that would reduce the margin of error. If they decrease the confidence level, then they are decreasing the level of certainty that they have captured the true mean.

Twenty-five fast-food restaurant hourly employees were surveyed to see how many hours they worked per week, on average. The following data was obtained:31, 43, 33, 20, 46, 52, 34, 26, 30, 40, 28, 44, 3, 46, 51, 43, 24, 31, 37, 55, 41, 42, 38, 24, 28Construct a 99% confidence interval for the mean number of hours per week that the population of fast-food restaurant employees work.xˉ=s=α2=tα2=Margin of Error: E=We are 99% confident that fast-food restaurant hourly employees, on average, work between___ hours and  ___hours per week.

Provide a significance level and explain how the confidence levels, C, are different for one and two tail tests. Provide pictures (with areas labeled) to support each C.

A pollof 2000 randomly selected students in grades 6 through 8 was conducted and found that 48% enjoy playing sports. Is the 48% result a statistic or a parameter?

How can I calculate part B using excel?