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Explain the mean and median and first quartile and third quartile. One of the major measures of the quality of service provided by any organization is the speed with which responds to customer
Nationwide, the average waiting time until electric utility customer service representative answers a call is 300 seconds per call. The Gigantic Kilowatt Energy Company took a sample of 35 calls and
An experiment was performed to enhance the yield of chemical process. Four factors were selected, and two replicates of the completely randomized experiment were run. The results are shown in follow
Recall that the cigarette industry requires that models in cigarette ads must appear to be at least 25 years old. Also recall that a sample of 50 people is randomly selected at a shopping mall.
Construct a histogram as well as a percentage polygon. The subsequent data represent the cost of electricity during July 2006 for a random sample of 50 one-bedroom apartments in a large city:
A bond analyst is analyzing the interest rates for equivalent municipal bonds issued by two different states. At _ = .05, is there a difference in the interest rates paid by the two states.
Construct a frequency distribution as well as a percentage distribution. The subsequent data represent the cost of electricity during July 2006 for a random sample of 50 one-bedroom apartments i
Find out the point estimate and 95% confidence interval for mean family dental expenses of all employees of the company.
A personnel manager is concerned about absenteeism. She decides to sample the records to find out if absenteeism is distributed evenly throughout the six-day workweek. The null hypothesis to be test
Recently, students in a marketing research class were interested in the driving behaviour of students. Specifically, the marketing students were interested if exceeding the speed limit was related t
Construct a Pareto diagram as well as give conclusions The subsequent data represent complaints about hotel rooms
In testing the equality of the two means below, what is the test statistic? (Make use of the unequal variances formula)
Give assumptions for the given questions using geographical method. A survey of 705 workers asked how much they utilized the internet at work.
The average price of regular gasoline in continental US states and District of Columbia was $3.74 on August 18, 2008.
Express the confidence interval .600, .800 in the form p-hat plus and minus E.
Construct a bar chart and a pie chart and a Pareto chart A survey of 705 workers requested how much they used the internet at work.
For the samples summarized below, test the hypothesis at ∞ =.05 that the two variances are equal. Variance Number of data values Sample 1 19 8 Sample 2 9 18.
Explain the standard deviation, range and Z score for given data Using the following sample
Explain the mean, median and mode for the given data Using the subsequent sample
Find out the minimum needed sample size if you want to be 95% confident that sample mean is in two units of true population mean. Suppose that sigma = 7.8 and that the population is normally distri
At a certain university, the average cost of books per student was $400 per student last semester. In a sample of 40 students this semester, their average cost was $430 with a standard deviation of
Explain what is the definition of the 90th percentile? For any distribution the mark that separates the highest 10% from the rest of the scores is called
A recent survey indicated that the average amount spent for breakfast by business managers was $7.58 with the standard deviation of $0.42. It was felt that breakfasts on the West Coast were higher t
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Suppose the variable is normally distributed and a
Assume that in a hypothesis test with null hypothesis 0 μ H : = 13.0 at a = 0.05, that a value of 11.0 for the sample mean results in the null hypothesis not being rejected.