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A sample of 35 different payroll departments found that employees worked an average of 240.6 days a year. If the population standard deviation is 18.8 days, find the 90% confidence interval for the average number of days worked by all employees who are paid through payroll departments.
Assume that the president is correct and p = 0.26. What is the sampling distribution of for this study? What is the probability that the sample proportion will be between .20 and .40 (to 4 decimals)?
What percentage of adults do not conduct their banking online? What type of probability is the 25% mentioned above?
Your client has $50,000 to invest and you plan to invest 60% in the security with the highest expected return. What would be the characteristics of this portfolio be (E(R),S)?
Show that maximizing expression (Eq. 8.37) yields the normal equations (Eq. 8.38),
Assume that the number of Telephone calls arriving in an office during a 15minute period has a Poisson distribution with mean number of calls equal 5.
Compute the z-score for M = 89 for a sample of n = 25 scores. Is this sample mean in the middle 95% of the distribution?
An entrepreneur owns two hotels, one in the western region of a certain state and the other in the eastern region. He thinks that the average amount spent by guests for lunch at his Friendly Café-West is less than $34.50
chicken delight claims that 88 percent of its orders are delivered within 10 minutes of the time the order is placed. a
A supermarket is interested in finding out wheather the mean weekly sales volume of Coca-Cola are the same when the softdrinks are displayed on the top shelf and when they are displayed on the bottom shelf.
If a randomly selected individual is observed to earn at least $60,000 per year, what is the probability that this person is a woman?
Find the exact chance (i.e., not using a normal approximation) that he loses $400 or more over the course of the evening.
In a survey of women in a certain country (ages 20-29) the mean height was 64.5 inches with a standard deviation of 2.75 inches. What height represents the 90th percentile? What height represents the first quartile?
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