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A company is interested in estimating the mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 100 personnel files and notes the number of sick days taken by each employee. The sample mean is 12.2 days and the sample standard deviation is 10 days. How many personnel files would the director have to select in order to estimate u to within 2 days with a 99% confidence interval?
The symphony sells raffle tickets each year to raise money. Assume they sell 2000 tickets and the tickets cost $100 each.
Robinson & Associates performs employment screening for large companies in southern California. It usually follows two-step process. First potential applicants are given a test that covers basic knowledge and intelligence. If applicants score b..
Setermine the probability that a specific driver had exactly two violations?
A group of students collected data at the Cedar Point amusement park and reported that the "wait time" to ride the "Top Thrill Dragster" roller coaster is consistently distributed within a range of 40 minutes to 90 minutes.
Findout the probability using normal approximation for the provided values. Findout the specified probability from a table of Normal probabilities.
What would you recommend Taylor do to cut back its labor cost? (Illustrate using an ABC plan.)
To test there is significant difference among the mean of income using ANOVA. A developer of real estate is considering investing in a shopping mall on the outskirts of Atlanta, Georgia.
Woodco manufactures tables and chairs. Each table and chair must be made entirely out of oak or entirely out of pine. A total of 150 board feet of oak and 210 board feet of pine are available.
Is the distinction among various parts of the bell-shaped curve arbitrary or is there certain logical and rational principle involved that creates such distinctive demarcations shown in a chart like this?
Here are fifty observations on the weight of tea bags. Create mean, mode and median.
Using a normal distribution with a mean of 1118 and a standard deviation of 52 for the weights of steers, what percent of steers weigh over 1250 pounds, under 1100 pounds, between 1000 and 1150 pounds.
A random sample of size 25 is taken from a normal population having a mean of 80 and a standard deviation of 5. A second random sample of size 36 is taken from a different normal population having a mean of 75 and a standard deviation of 3.
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