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A bag contains 6 red balls and 4 blue balls. 3 red balls are selected at random. Find the probability of selecting 3 red balls.
How many different committees can be formed from 12 teachers and 50 students if the committee consists of 4 teachers and 3 students?
What is the probability that a customer will have to replace the pads only once during a period of 10 years? What is the probability that a customer does not pay in excess of $500 for a brake pad repl
Suppose we are comparing the variability in healthcare costs from one state to another in the us. For state 1 the standard ev in healthcare cost was found to be $5000. State 2 is known to have less
A group of men and women between the ages of 25 and 35 were asked how many hours they work last week. Do to determine ther is a significant diff between me and women in the mean number of hous work
Since the models cost about the same, she was interested in determining whether there was a difference in the average time the battery packs would function before needing to be recharged. She took t
The Environmental Protection Agency wanted to compare the proportion of plants in violation of air quality standards for two different industries: steel and utility. Two independent samples of plant
Rachel works in the retail industry, where the mean salary for executives with less than five years' experience is $35,000 with a standard deviation of $8,000. Rob is an engineer. The mean salary fo
Suppose the population standard deviation is unknown. If 71% of all sample means are greater than 49 hours and the population mean is still 50.4 hours, what is the value of the population standard d
Historically, the average time it takes Jessica to swim the 200 meter butterfly is 148.4 seconds. Jessica would like to know if her average time has changed. She records her time on 50 randomly sele
A new light bulb is being considered for use in an office with computers. It is decided that the new bulb will only be used if it has a mean lifetime of more than 500 hours. A random sample of 40 bu
A government testing agency studies aspirin capsules to see if customers are getting cheated with capsules that contain lesser amounts of medication than advertised.
Lester Hollar is vice president for human resources for a large manufacturing company. In recent years, he has noticed an increase in absenteeism that he thinks is related to the general health of t
Given a 99% confidence interval for p1-p2 as (-0.58, 0.58). What can be concluded?
At the 0.025 significance level, is it reasonable to conclude the mean income of those selecting Plan B is larger? Hint: For the calculations, assume the Plan A as the first sample.
Given a 90% confidence interval for mu1-mu2 as (-5,5). What can be concluded?
Suppose a population proportion is .40, and 80% of the time when you draw a random sample from this population you get a sample proportion of .35 or more. How large a sample were you taking?
Calculate and interpret a confidence interval at the 99% confidence level for the proportion of all adult americans who have watched streamed programming.
A toaster manufacturer receives large shipments of thermal switches from a supplier. A sample from each shipment is selected and tested. The manufacturer is willing to send the shipment back if the
Identify a situation where the central limit theorem is useful and will give you a more accurate answer.
What is the probability that at least one of the three randomly selected households own a bird? (Round to the nearest hundredth) _______
A population has a mean of 50 and a standard deviation of 13. If a random sample of 36 is taken, what is the probability that the sample mean is each of the following?
A market research firm did a report about the residential telephone numbers in New York State, which says 54% of all residential telephone number in NY are unlisted.