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How would one have to set the tolerance limits 20-c and 20+c such that one produces at most 5 percent scrap? Assume that the mean has shifted to =20.10. Calculate the percentage of metal plates that
An independent random sample of 340 natural gas trade ads contained 47 humorous ads. Test at alpha = .02 to determine if there is a difference in the proportion of humorous ads in the two industries
A statewide real estate agency, New Colony, specializes in residential home sales in southern California. Records indicate the mean selling time of homes is 90 days.
Mathew R. is conducting a study on the dollar value of orders placed with various suppliers. A sample of 10 orders showed amounts in thousands of dollars iof 43.6, 61.3, 54, 70.7, 46, 56.3, 58.8, 73
Is the job change rate at Pioneer significantly different than the study results? Test at a level of significance of .05. (5) Find the p-value for the test results. (1)
Discuss the concept of sampling distributions, and describe the rationale for their use in making inferences about population parameters. Include the importance of the Central Limit Theorem in this
Explain how various factors determine the width of confidence intervals. Indicate how changes in these factors affect the size of a given estimate.
Calculate a 90% prediction interval for a randomely selcted single indivdual from the popultation. With a sample mean of .925 and a sample standard deviation of .00653
It is desired to test whether the number of gamma rays emitted per second by a certain radioactive substance is a random variable having the Poisson distribution with ? = 2:4. Use the following data
What is the probability of a joint having one bad weld? If a joint has two bad welds, what is the probability that it was done on a Friday?
In a recent study of 35 ninth-grade students, the mean number of hours per week that they played video games was 16.6. The standard deviation of the population was 2.8.
One of the issues facing organizations is increasing biodiversity throughout the organization. Once of the ways to evaluate an organization's success at increasing diversity id to compare the perce
Discuss the effecct that sample size has on hypothesis testing. What do you think are your chances of rejecting any null hypothesis concerning a population proportion if a sample size of n=20 is used
Your personal study has shown that only 68 of the 100 in your sample lasted the 2 years without incurring repair expenses. What is the probability of your sample outcome or less if the actual repair
A machine is programmed to fill 10-oz. containers with a cleanser. However, the variability inherent in any machine causes the actual amounts of fill to vary. The distribution is normal with a stand
An F-curve has df=24,30). In each case, find the F-value that has the specified area to its right. Draw diagrams to illustrate your answers in each case.
A random sample of n = 400 measurements is drawn from a binomial population with probability of success .21. Give the mean and the standard deviation of the sampling distribution of the sample prop
Determine the smallest integer number of trunk lines needed so that tq the waiting time in the queue satisfies the relation t P[tq < 60 sec.]> 0.95, i.e., the probability exceeds 95% that the
The amounts a soft drink machiene is designed to dispense for each drink are normally distributed, with a mean of 12.2 fluid ounces and a standard deviation of 0.3 fluid ounce. A drink is randomly
In 2010, 91% of households had at least one cell phone. A random sample of 300 households in each of two different counties indicated the following. At the 0.01 level of significance. Can it be conc
Assume you have applied for two jobs, A and B. the probablility that you get job a is .13. the probability of being offered job B is .18. the probability of getting atleast one of the jobs is .26.w
Statistical Abstracts (117th edition) reports that the average amount spent annually for food by householders under 25 years of age is $2,690. A random sample of 16 people under 25 years of age who
Suppose you calculate a 99% confidence interval of 14.22 to 21.23. Determine the margin of error
The waiting time (in minutes) between ordering and receiving your meal at a certain restaurant is exponentially distributed with a mean of 10 minutes. The resturant has a policy that your meal is fr
The volume of a soda dispensing machine pours into a 12-ounce can of soda follows a normal distribution with a mean of 12.30 ounces and a standard deviation of .20 ounce