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Hollow is proud of their energy saving program. A sample of 29 houses reveals an average saving of 47.5 kilowatt hours per week with a standard deviation of 55. Find the t score for a 90% confidence limit.
Based on the answer from question 9, calculate 90% confidence limit around your best estimate of the average savings.
For a school project, he will display an equal number of each kind of stamp on a small poster boards. What is the greatest number of poster boards Adam can make if he uses all of the stamps?
On average, 40 percent of U.S. beer drinkers order light beer. (a) What is the probability that none of the next eight customers who order beer will order light beer?
In a box of 15 marbles, 4 are green. You choose 2 at random without replacement (a) Create a tree diagram for the 2 draws. (b) Create a probability model for the number of green marbles in two draws.
Assume that the variable B is the number of years of experience. Suppose the person has 2 years of college and 7 years of experience. What should their salary be?
A quality control specialist compares the output from a machine with a new lubricant to the output of machines with the old lubricant.
hoping to lure more shoppers downtown a city built a new public parking garage in the central business distri. the city
Assume that 13% of people are left-handed. If we select 5 people at random, find the probability of each outcome described.
Data from a National Health Survey show that men's average weight is normally distributed with a mean of 172 pounds and a standard deviation of 29 pounds.
Remaining the same value. Estimate the probability at least two of the stocks increase in value. Estimate the probability at least two of the stocks increase in value.
use the binomial probability distribution when your random variable is the number of successes on n success or failure
According to the Economist (1998), the sex industry is worth at least US$20bn (£11bn) a year and probably many times that figure. There are different categories of what may be called services, e.g. prostitution, striptease and telephone sex. There..
Let X be a normal distributed random Variable with u=100 and o=10. the probability that X is between 70 and 100 is:
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