Question: According to the personnel department the average commuting time for
According to the personnel department, the average commuting time for workers within a 50-kilometre radius of your company's head office is 32 minutes. You suspect that, because of development in the area and increased traffic, the average commuting time has increased. Suppose you know that if the personnel department's estimate was correct, sample means would be normally distributed, with a mean of 32 minutes and a standard deviation of 5 minutes. You take a random sample of 20 employees, and calculate a sample mean of 40 minutes. Does this provide evidence that commuting times have increased?
Answer to relevant QuestionsSuppose the cereal boxes in a factory are supposed to contain 645 grams of cereal. Assume that when the filling line is properly adjusted, the weights of the cereal boxes are normally distributed with a standard deviation of ...A small college in southern Ontario advertises that its business graduates earn an average annual income of $37,323 the first year after graduation. A researcher has been given the task of checking the claim for the 2010 ...The college cafeteria manager claims that 90% of cafeteria customers are satisfied with the range of food served and prices. Suppose that in a random sample of 500 cafeteria customers, 438 say they are satisfied with the ...A marketing research organization wanted to see if the average household incomes in a particular suburb of Halifax were more than $50,000 a year. A random sample of 40 households revealed the household income data available ...The same poll referred to above said that 34% of home owners are borrowing to renovate. At the 2% significance level, does the survey support the claim that more than a third of homeowners borrow to renovate?
Post your question