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To estimate the proportion of unemployedworkers in Panama, an economist selected at random 400 persons from the working class. Of these, 25 were unemployed.
a. Estimate the true proportion of unemployed workers and place bounds on the error of estimation.
b. How many persons must be sampled to reduce the bound on the error of estimation to .02?
Ten people agree to take part in an experiment designed to determine whether a persons weight differs between morning & evening.
A random sample of 24 groups of adults has a mean daily lodging cost of $233 and a standard deviation of $12.50. Is there enough evidence to reject the claim at α= 0.10? Assume the population is normally distributed.
Determine the probability that adult owns stock and has some college education? Determine the probability that adult owns stock or has some college education?
based on a survey of 1000 adults by greenfield online and reported in a may 2009 usa today snapshot adults 24 years of
The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 100 hours.
determine the total area under the standard normal curve in parts a through c below. a find the area under the normal
The number of column inches of classified advertisements appearing on Mondays in a certain daily newspaper is normally distributed with a population mean of 320 and a population standard deviation of 20 inches.
Your firm has classified orders as either large or small in dollar amount and as either light or heavy in shipping weight. In the recent past, 28% of orders have been large dollar amounts
In a large shipment of automobile tires, 10% have a flaw. Four tires are chosen at random to be installed on a car.What is the probability that none of the tires have a flaw?
if i go into a pizza house and i have the choice of having one of 3 different types of dough with one of 7 different
in how many ways can a photographer arrange 6 people in a row from a group of 10 people where the bride and groom are
mimi just started her tennis class three weeks ago. on average she is able to return 35 of her opponents serves. let
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