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Suppose a fast-food wishes to estimate averages sales volume for a new menu item. The restaurant has analyzed the sales of the item at a similar outlet and observed the following results:
Suppose you are planning to sample cat owners to determine the average number of cans of cat food they purchase monthly.The following standards have beed set: a confidence level of 99% and an error
Determine the distribution function x -> P (X equal or less than x). (Hint: Remember that the life of the entire system is equal to the maximum of the lifetimes of the two copies of the item.)
In a survey of 500 people, 60% responded with agreement to an attitude question. Calculate a confidence interval at 95% to get an interval estimate for a porportion.
A researcher expects the population proportion of Cubs fans in Chicago to be 80%. The researcher wishes to have an error of less than 5% and to be 95% confident of an estimate to be made from a mai
What is the expected profit? (note: profit is defined as the difference between cost and revenue). Using expected profit as the decision criterion, does it pay for the store to lease a fourth video
A traffic light alternates between green and red (let's ignore yellow) and stays green for 60 seconds and red for 30 seconds.
What is the expected value of the winnings for a person playing this game once? What other totals of the three dice would have the same expected value as rolling 21? Explain your answer.
What is the probability that fewer than two of the original bulbs will fail within 50030 hours of operation? What is the probability that no bulbs will have to be replaced within 50030 hours of operat
Find the total number of ways to have n lattices containing one ball each, and the other N-n lattices containing no balls. Note that in this part, the n lattices may be any n lattices out of the N l
An elevator starts from the 1st floor with 8 passengers and may stop at the 2nd or the 3rd floor or both. Suppose that each passenger may get out of the elevator at either of the 2nd or the 3rd floo
If the random variable has the normal distribution µ = 62.5 and ?2 = 100, find the probabilities that it will take on a value less than 84.9, greater than 48.6 and between 55.3 and 81.2.
The way the game works is you are given three dice - one six-sided die, one ten-sided die and one twenty-sided die. It costs $1 to play the game and if you roll the three dice and get a total of exa
The population of lengths of aluminum-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.
At a certain community, 20% of the men and 1% of the women are over 6 feet tall. 40% of the member of the community member are women. If a member of this community picked and observed to be over 6f
Using the p-value approach, test to see if the average length of stay in RFH is significantly less than the average length of stay in GH. Let a = 0.05.
Computer keyboard failures can be attributed to electrical defects or mechanical defects. A repair facility currently has 25 failed keyboards, 6 of which have electrical defects and 19 of which have
A starting lineup in basketball consists of two guards, two forwards, and a center. Suppose the roster has 5 guards, 5 forwards, 3 centers, and 2 "swing players" (X and Y) who can play either guard
A 95% confidence interval for a population mean was reported to be 152 to 160. If s 15, what sample size was used in this study?
A starting lineup in basketball consists of two guards, two forwards, and a center. A certain college team has on its roster three centers, four guards, four forwards, and one individual (X) who can
What is the probability that the individual gains access to the account given that he knows all the rules to making a PIN? (PIN cannot be all four identical digits, pin cannot be sequences of consec
Assume that a sample is drawn and z(a/2) = 1.96 and s = 35. Answer the following questions: If the Maximum Error of Estimate is 0.02 for this sample, what would be the sample size?
1. Consider a normal population with µ = 25 and s = 7.0. (A) Calculate the standard score for a value x of 26.
Students in a class take quiz with eight question. The number of x questions awnsered correctly can be approximated by following probabaility distributuion.