Difference in proportions exists
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 concluded that a difference in proportions exists?
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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 free if you have to wait more than 25 minutes after
Suppose you calculate a 99% confidence interval of 14.22 to 21.23. Determine the margin of error
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 live in a university neighborhood were surveyed.
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.what is the probability that you will be offered bo
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 selected.
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 time the message spends in the buffer is less tha
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 proportion.
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.
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