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Question: Samples of size n = 5 are collected from a process every half hour. After 50 samples have been collected, we calculate x‾= 20.0 and s‾= 1.5. Assume that both charts exhibit control and that the quality characteristic is normally distributed.
a) Estimate the process standard deviation.
b) Find the control limits on the x‾ and s charts.
c) If the process mean shifts to 22, what is the probability of concluding that the process is still in control?
Does this data indicate that the sentiment for increasing the speed limit is different for the two groups of residents? Let p1 refer to the urban population.
A study of the time spent shopping in a supermar- ket for a market basket of 20 specific items showed an approximately uniform distribution between 20 minutes and 40 minutes. What is the probability that the shopping time will be:
q1. a manufacturing company measures the weight of boxes before shipping them to the customers. if the box weights have
(a) Find the median cost of houses at Coal City in 1988. (b) Find the modal selling price of houses at Coal City in 1988.
A survey of middle-aged men reveals that 28% of them are balding at the crown of their heads. Moreover, it is known that 18% of all middle-aged men who have this balding pattern will suffer a heart attack in the next 10 years.
She is interested in testing the null hypothesis that the mean SAT score is the same for each type of schooling using the one-way ANOVA. Some summary statistics for the three groups are given below, followed by the one-way ANOVA table.
question a research team compared two methods of measuring tread wear on tires. eleven tires were each measured for
Compute the probability that 8 or more women would be laid off at random. Based on your answer, do you think that management really laid off these people randomly? Explain.
A year after graduation. Find the probability that 8 randomly selected graduates all find jobs in their chosen field within a year of graduating.
What is the probability that on your next trip to your friend's house, you will have to stop for exactly one red light and what is the probability that you will have to stop for at least one red light
Use the moving-average method to make seasonally-adjusted trend estimates for the third and fourth quarters of 2013 and the first two quarters of 2014. Assume that the cyclical and irregular forces have minimal influence on the time series. (Show d..
Calculate the sample proportion of women who died in the week before Christmas. (Round your answer to three decimal places.)
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