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What is the minimum number of tellers required for there to exist a steady state for this queuing system? What is the minimum number of tellers required to meet the 2-minute criterion?
The eagle ridge contractors association claims the average price of a home in thier subdivision is $125,150 with a standard deviation of $7,350. A sample of 36 homes for sales in this subdivision ha
Customers arrive at a thrift bank according to a poisson distribution with a mean of 45 customers per hour. Transactions per customer last about 5 minutes and are exponentially distributed.
If the same mean is 11, the hypothesized population mean 10, and the population standard deviation is 4, compute the test value needed for the z test.
Write the hypothesis statements. Explain what test statistic will be used and why. Compute the test statistic.
Construct a 95% confidence interval estimate of the proportion of medical malpractice suits that were dropped or dismissed? Does it appear that a majority of such suits were dropped or dismissed?
The value of the linear correlation coefficient is reported by an investigator to be 0.55. Based on this statistic we can conclude that: 55% of the variability in the predictor can be explained by t
The standard normal table shows an area value of 0.8 for a z-score of 0.84. What percentage of the observations of a random variable that is normally distributed will be more than 0.84 standard devi
Assume that a sample is used to estimate a population proportion p. Find the margin of error E that corresponds to the given statistics and confidence level. Round the margin of error to four decima
For the test of equal population means versus unequal population means, the absolute value for the computed test statistic, the critical values, and the p-value respectively are:
The accompanying data are x = advertising share and y = market share for a particular brand of cigarettes during 10 randomly selected years.
A survey of 865 voters in one state reveals that 408 favor approval of an issue before the legislature. Construct the 95% confidence interval for the proportion of all voters in the state who favor
A student survey was done to study the relationship between gender and favorite television program watched on Sunday mornings (sports, news, or other). The chi-square test statistic was 8. What is t
In a test of the effectiveness of a device that is supposed to increase gasoline mileage in automobiles, 12 cars were run over a prescribed course both with and without the device. The mileages are
A student survey was done to study the relationship between where students live (dormitory, apartment, house, co-op, or parent' home) and how they usually got to campus (walking, bus, bicycle, car,
If the mean monthly sales due to online purchases has not changed, there is a 1% chance (or 1 out of every 100 samples) that the resulting mean sales would occur assuming the historical mean for sal
A restaurant owner claims the percentage of his customer distribution is Monday (10%), Tuesday (12%), Wednesday (10%), Thursday (15%), Friday (20%), and Saturday (33%). The restaurant closed on Sund
Suppose that you arrive at a single-teller office to find three customers waiting in line and one being served. If the service time is exponential with rate 2 minutes, calculate the probability that
Fifty sampling units of equal size were inspected, and the number of nonconforming situations was recorded. The total number of instances was 449.
Cronbach's alpha and the split-half reliability coefficient are both instruments to determine the reliability of a scale.
Calculate a prediction for the amount of warpage of a single piece of laminate in a way that provides information about precision and reliability. (Use a 95% prediction interval. Round your answers
That the independent variable is measured on an interval- or ratio scale and the dependent variable is measured on a nominal- or ordinal scale.
A bag contains 3 red marbles, 4 green ones, 1 lavender one, 3 yellows, and 2 orange marbles. How many sets of five marbles include either the lavender one or exactly one yellow one but not both colors
xyz grocery a large regional supermarket chain employs over 9000 people. it has been claimed by the company that the mean age of all employees is 43.7 years with a standard deviation of 7.3 years. t
What are the basic characteristics of a normal distribution and the normal curve?