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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
You want to compare years of schooling among American adults who describe their political veiwpoint as liberal, moderate, or conservative. You gather a random sample of American adults in each of t
A small life insurance company has determined that on the average it receives 3 death claims per day. What is the probability that the company receives at least seven death claims on a randomly sele
What are the average and standard deviation of the time (in months) until he goes to the shop and discovers they will have to order the pick he wants?
How large of a sample is required? How large of a sample would be necessary if no estimate were available for the proportion that support current policy?
A sample survey is designed to estimate the proportion of sports utility vehicles being driven in the state of California. A random sample of 500 registrations are selected from a Department of Moto
After viewing the comedy, 240 indicated they would watch the new show and suggested it replace the crime investigation show. Develop a 95 percent confidence interval for the population proportion.
Which of the following statements are true if the value of the test statistic for a two-tailed z test is z = -1.56?
60% of individuals keep their cars at most how many years? Suppose that we randomly survey one person. Find the probability that person keeps his/her car less than 2.5 years.
According to a government study among adults in the 25- to 34-year age group, the mean amount spent per year on reading and entertainment is $1,896. Assume that the distribution of the amounts spent
A cola-dispensing machine is set to dispense a mean of 2.026 liters into a container labeled 2 liters. Actual quantities dispensed vary and the amounts are normally distributed with a standard devia
In a few sentences can you explain why is it important to be able to translate reported findings for research studies into practical applications?
According to a recent study, 1 in every 10 women has been a victim of domestic abuse at some points in her life. Suppose we have randomly and independently sampled twenty-five women and asked each w