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The McCollough Corporation, a producer of various kinds of batteries, has been producing D size batteries with a life expectancy of 87 hours. Due to an improved production process, the management believes that there has been an increase in the life expectancy of their D size batteries. A sample of 36 batteries showed an average life of 88.5 hours. Assume from past information that is known that the standard deviation of the population is 9 hours. Use a 0.01 level of significance and test management's belief.
Using your own experience, estimate the probability the local weather forecast is correct. Explain the rationale behind your estimate.
How does multilinear regression analysis apply to your profession? Specify the dependent value and the set of predictors. Where would you get the data?
Calculate and plot t he new supply schedule and indicate the new equilibrium price and quantity on your diagram
Develop a frequency distribution table with proportions. What is an experiment? Can you describe what a Group Frequency Distribution Table is and what it looks like?
The employees of a company were surveyed on questions regarding their educational background and marital status. Of the 600 employees
A fabric manufacturer wants to know how large an advantage in strength fabrics treated by the Permafresh method have over the fabrics treated by the Hylite process. Give a 90% confidence interval for the difference in mean breaking strengths.
Problem based on combinatory - how many different license plates are possible?
The random variable x, which is the number of occurrences of an event over an interval of ten minutes. It can be assumed that the probability of an occurrence is the same in any two time periods of an equal length. It is known that the mean number..
Implement your model on a spreadsheet and find the optimal solution using Solver.
According to study done by Nick Wilson of Otago University, the probability a randomly selected individual will not cover his or her mouth when sneezing was 0.267. Suppose you sit on a mall bench and observe 200 people pass by as they sneeze.
The t-statistics that was obtained in the study of 400 subjects was t=20, rejecting the null hypothesis and showing that the drug has a beneficial effect. Why was management upset?
A sample of 160 workers in the downtown area classified each worker by race. A bar graph of the results is given below, but the bar for black workers in the graph below has been omitted.
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