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Consider given Exercise, which deals with the average wait time for the arrival of a cab. Using the data in Table 7-25, construct a geometric moving-average control chart. Use a weighting factor of 0.10. What conclusions can you draw from the chart? How is it different from the moving-average control chart constructed in Exercise?
Exercise The average time (minutes) that a customer has to wait for the arrival of a cab after calling the company has been observed for random samples of size 4. The data for 20 such samples are shown in Table 7-25. Previous analysis gave the upper and lower control limits for an X-chart when the process was in control as 10.5 and 7.7 minutes, respectively. What is your estimate of the standard deviation of the waiting time for a customer? Construct a moving-average control chart using a span of 3. What conclusions can you draw from the chart?
When assigning probabilities of two simple events, can we assume that each event is always equally likely to occur and, thus assign .5 to each event?
Almost 20% of the stratum was sampled compared to the second stratum where only 2% of the stratum was sampled. Will this phenomenon introduce bias into the above estimates?
According to the U.S. Census Bureau, the mean household income in the United States in 2000 was $57,045 and the median household income was $42,148.
a a student who waits for two buses every day records the status of the arrival of each bus. the bus is either late on
Determine the probability of a positive economic trend given an increasing employment. Are employment and economic trend independent?
What is the probability that the sample mean will be greater than M = 510. In symbols, what is p (M>510)?
Suppose the counselor found the sum of squared deviations from the mean of the sample to be 135. Given that he tested 10 people, what would be the estimated population variance?
This problem related to Basic Statistics and it is about a study on the average wages of a fast food restaurant worker. The problem is about picking up a random worker whose salary is above the average wage
the attendance at baseball games at a certain stadium is normally distributed with a mean of 45000 and a standard
in a recent survey concerning company sales and net earnings 15 companies responded. data analysis was computed letting
a rare disease occurs in about 1 out of 1000 people who are similar to you. a test for the disease has sensitivity of
The data collected was for each car for each type of fuel. Performance was measured in miles per gallon. Perform an ANOVA test and state the results.
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