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Unfortunately, the company has a problem with the variability of the weight. In a sample of 14 of the bowling balls the sample standard deviation was found to be 0.52 pounds. Construct a 95% confide
In a given year, the average annual salary of a NFL football player was $205,000 with a standard deviation of $24,500. If a simple random sample of 50 players was taken, what is the probability that
What is the probability you will be dealt two clubs in a row? Assume no other clubs are dealt except to you. Base on this robaiblity, should you stay in the hand?
Suppose that 20% of all Internet users have posted photos online. A sample survey interviews 1555 users. What is the probability that 300 or fewer people in the sample have posted photos online?
The average weight was 18 pounds. Assume that the standard deviation of the sample to be 7.5 pounds. Determine a 90% confidence interval estimate for the mean weight of the carry-on luggage.
If the supplier selects the pairs of earrings at random, what is the chance that the jewelry store gets exactly two sets of platinum pairs?
From Company B, 550 stereos are purchased and 4% are found to be defective. Given that a stereo is defective, find the probability that it came from Company A.
A shipment of 150 television sets contains three defective units. If a vending company buys three of the units in the shipment, what is the probability that at least one of the units is defective?
Repeating this experiment many times with different samples, what values for the sample means would be possible? What values would repeat more often?
A tire company produced a batch of 5700 tires that includes 230 that are defective. If 4 tires are randomly selected for installation on a car, what is the probability that they are all good?
In a sample of 855 bartenders, 48% report hearing complaints from patrons about their jobs. If the maximum error of estimate for the proportion of bartenders hearing job complaints is 4.4 percentage
A new battery's voltage may be acceptable or unacceptable. A certain flashlight requires 2 batteries, so batteries will be independently selected and tested until 2 working ones are found. Assume th
What sample size is recommended for the hypothesis test? Use 30 hours as an estimate of the population standard deviation.
Imagine a TV game show where each contestant i spins an infinitely calibrated wheel of fortune, which assigns him/her with some real number with a value between 1 and 100. All values are equally lik
Use a 0.01 significance level to test the claim that the insecticide of malaria is lower for infants who use their Bednets. Do the Bednets appear to be effective?
A sample of n days finds that the mean pH is x = 4.8." Give a 98% confidence interval for the mean pH μ when n = 5, n = 15, and n = 40
(A) Make a histogram for the distribution of probabilities. (B) What is the probability that 6 or more claims are made by males under 25? (C) What is the expected number of claims made by males unde
What is the probability that in January of 2003 a randomly selected worker spent fewer than 50 hours per month logged on to the Internet?
List all the possible samples that can be drawn without replacement from this population,calculate their means and, assigning each of these values with their corresponding probability,
The number of deaths annually from tornadoes in the U.S.A. is less than 30. If a sample of 9 randomly selected years had a standard deviation of 29, is the claim believable? Use = .01?
Assume you have the following data: H0: = 200, S = 30, n = 64, and X-bar= 218. Conduct a two-tailed hypothesis test at the .05 significance level
A survey found that at most 40% of those surveyed planned to get more sleep. A sample of 300 people found that 140 of them plan to get more sleep. For alpha = 0.01, what is the critical value?
A random sample of n=9 men between 30-39 years old is asked to do as many sit ups as they can in one minute. The mean number is x=26.2 and the standard deviation is s=6.
The time that customers take to complete their transaction at a money machine is a random variable with mean = 2 minutes and standard deviation = 0.6 minute. Find the probability that a random sampl
Test the manager's suspicion at the 5% level of significance. Find the P-value or an interval containing the P-value for the sample test statistic.