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A production system has two production lines; each production line performs a two-[art process, and each process is completed by a different machine. Thus, there are four machines, which we can identify as two first-level machines and two second-level machines. Each of the first-level machines works properly 98% of the time, and each of the second-level machines works properly 96% of the time. All four machines are independent in regard to working properly or breaking down. Two products enter this production system, one in each production line.
a. Find the probability that both products successfully complete the two-part process (i.e. all four machines are working properly).
b. Find the probability that neither product successfully completes the two-part process (i.e. at least one of the machines in each production line is not working properly).
A population whose shape is unknown has a median of 75. You selected a sample of 40. The standard deviation of the median is 5. Calculate the probability that the median of the sample or average medians is:
an experiment investigating the effect of exercise on happiness randomly assigns participants to one of four groups
30 in Canada, and 6 in the United State. At level of significance 0.05, test whether the distribution of sales has changed from last year.
A furniture store claims that a specially ordered product will take, on average, mean= 35 days (5 weeks) to arrive. The standard deviation of these waiting times is 5 days.
find the average scoregradefrequency90-991580-891170-79860-69350-59240-491use the exact
Temperature is used to measure the output of a production process.When the process is in control, the mean of the process is = 128.5. Construct the x chart for this process if samples of size 6 are to be used.
The sample mean production rate for the 18 employees was 80 parts per hour. The sample standard deviation was 10 parts per hour. Construct the 90% confidence interval estimate for the mean production rate for the new method.
In a survey of 6000 high school students, 3230 read books during the summer break. Using these sample statistics, find a 99% confidence interval for the proportion p of all high school students that read books during the summer break.
Exploitron, Inc. conducts a random survey of 700 of their workers and finds that the average employee earns $31,782 per year, with a standard deviation of $622. The Census reports that the average American worker makes $30,059. The CEO of Exploitron ..
question previous small study was investigating the total cost of 10 specific items of fruits and vegetables which
Standardize the value according to the given average and SD - unstandardize the value according to the given average and SD
Based on what we know about statistics and using your example, how do you believe statistics can enrich and represent the results of a study? How can statistics be used to misrepresent the results of a study?
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