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A corporation randomly selects 150 salespeople and finds that 66% who have never taken a self-improvement course would like such a course. The firm did a similar study 10 years ago in which 60% of a random sample of 160 salespeople wanted a self-improvement course. The groups are assumed to be independent random samples. Let π1 and π2 represent the true proportion of workers who would like to attend a self-improvement course in the recent study and the past study, respectively. Construct a 95% confidence interval estimate of the difference in proportion of workers who would like to attend a self-improvement course in the recent study and the past study. Show how you obtain your answer.
The company tests to determine at the 0.05 level whether the population proportion has changed from the previous study. Which would be the conclusion? Explain how you obtain your answer.
In this article on factors contributing to tourism trends, common symbols used in weather forecasts are used to illustrate and summarize how a variety of factors driving tourism in the UK are changing.
If 25 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is less than 44.24 tons. Assume that the variable is normally distributed.
question a volunteer ambulance service handles zero to three service calls on any given day. the probability
Bill is completing a project for you in the marketing department. In conducting his anaysis regarding consumer behavior and a new product that has been released, he tells you the correlation between these two variables is 1.09.
1.as part of a promotion for a new type of cracker free samples are offered to shoppers in a local supermarket. the
The Spanish patients, two men and two women, were elderly and very ill. All four had undergone routine dialysis at the Hospital de la Princesa.
Per the textbook, in order to understand the causal relationship in business process, manager often asks "whys" to drill down the root cause of failures. Select one (1) project from your working or educational environment and propose at least thre..
Is there a significant difference the four testing conditions?
Calculate estimated Cohen's d to measure size of treatment effect.
In your next five races, what is the probability that you will swim under a minute exactly twice?
Cystic ?brosis is a lung disorder that often results in death. It is inherited but can be inherited only if both parents are carriers of an abnormal gene.
Carbon monoxide emissions for a certain kind of cary vary with mean 2.9 gm/mi and standard deviation 0.4 gm/mi. A company has 80 of these cars. Estimate the probability that the mean CO level is between 3.0 and 3.1 gm/mi.
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