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what is the shape of the sampling distribution of the sample mean that will be used to create the desired confidence interval for μ?
At the .10 level of significance, is that enough evidence to conclude that residents of Legacy Ranch use less water on average? What is the decision rule?
Assuming the amount of fill is normally distributed, what is the probability that the next randomly checked bottle contains more than 34.16 oz?
the average thickness of books on a library shelf is 8.3 centimeters.the standard deviation is 0.6 centimeter.if 20% of the books are oversied, find the minimum thickness of the oversized books on t
Two hailstones picked up in a row will have diameters greater than .6 inch? (Assume independence of the two diameters)
A selected Forecast Model showed the lowest MAD at the beginning of the year with $60.5. If the following three quarters reflected the following MAD.
What is the probability that none of the three parents condones spanking as a regular form of punishment for their children?
Determine the probability of an arriving customer finding at least five people already in the queue. Determine the same probability for a two-teller system.
The mean of the distribution was 60,000 miles and the standard deviation 2,000 miles. (Round z-score computation to 2 decimal places and your final answer to 2 decimal places. Omit the "%" sign in y
Which forecasting method would you prefer to use and why? Note: Compute MAPE for the two forecasting methods to compare the accuracy for the period 1992-1998.
How large a sample size will need to be selected if we wish to have a 99% confidence interval for the average diameter of this type of O-Ring with a margin for error of .02 centimeters?
The experiment consist of drawing one or two cards from an ordinary deck of playing cards, i.e., the deck has 4 suits with 13 cards per suit. Consider an Ace to be the highest card but not a face ca
Suppose we select a sample of 24 cuts from various CDs sold by CRA CDs Inc. What percent of the sample means will be greater than 140 but less than 152 seconds.
The distribution of the weights of a sample of 1,400 cargo containers is symmetric and bellshaped. According to the Empirical Rule, what percent of the weights will lie between and ? Below ?
How do you determine the type of statistical testing based on a relationship between pretest scoes and final exam scores while controlling for gpa?
Design/simulate a linear regression model with two independent variables which are correlated. Illustrate the severity of the multicollinearity with Variance Inflation Factor (VIF) analysis.
What is the expected value of purchasing a ticket in this lottery? How much net revenue does the state expect, on average from each ticket? What is the risk preference of people who play this lotter
If a certain mathematics department prefers to hire a secretary who knows TEX, what is the least number of applicants that should be interviewed so as to have at least 50% chance of finding one such
The 5280 magazine claims that the average cost of hotel rooms in Denver is $121.15. To test the claim, a statistician sample 35 hotels rooms and finds that the average cost is $124.75 wi
A sample space consists of 9 elementary outcomes E1,E2,E3, ...,E9 whose probabilities are: List the composition of the event A B and calculate P(A B)
A statistician was tasked to find out if the age of child is related to the number of the cavities he or she has. The data is listed here if there is a significant relationship; predict the nu
The standard deviation of demand is five plugs per day. Assume a normal distribution of demand during lead time and a 7-day work week. What are the total variable weekly costs including safety stock
a shipment of 250 netbooks contains 3 defective units. determine how many ways a vending maching company can buy three of these units and receive a) no defective units b) all defective units c) at l
Determine the transform for the probability density function for random variable X, where X is the time from the start of the exam until Dave makes his first conscious response which is preceded by
Find the distribution of profit for a unit price of $500. Use the Decision Table tool to find the best price between $400 and $600 in steps of $25.