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A survey found that people who took coldeeze at the onset of a cold suffered on average 42 hours. What proportion of the reprsentative sample (with a mean of 63 hours and standard deviation of 20 suffered for longer and 48 hours?
A social psychologist has developed a test measure gregariousness. The test is normed so that it has a mean of 70 and a standard deviation of 20, and the gregariousness scores are normally distributed in the population of college students used to ..
acme truck manufactures 8 and 16 wheel vehicles. in 2010 25 of trucks manufractured had 8 wheels and 75 of the trucks
The President of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies.
Suppose that you select a 50 families sample. Which is the form expected from the distribution of the average or median of the sample?
Eighty-eight shoppers were interviewed at random, and 59 said that they prefer to shop alone.
determine the area under the standard normal curve in parts a through c below. find the area under the normal curve to
At a national seashore, the number of swimmers per day who require lifeguard assistance averages 4.1, on any day when 7 or more swimmers are assisted, the lifeguards receive a $20 bonus for extra effort.
How could the Central Limit Theorem apply in making a business decision? Try to provide an example from your current or future career.
Let X1, ..., Xn be a random sample from a two-parameter exponential distribution, Xi ~ EXP (theta, eta). (a) Assuming it is known that eta = 150, find a pivotal quantity for the parameter theta based on the sufficient statistic.
The manager of Sandy Corporation wants to determine whether or not the type of work schedule for her employees has any effect on their productivity. She has selected 15 production employees at random and then randomly assigned 5 employees to each ..
The probability the champion is UCLA is 20%. What do these results say about testing with group data? Include in your answer the URLs of the sites where you found the necessary data.
under what circumstances should you use a grouped frequency distribution instead of a regular frequency
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