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Suppose that 10% of all steel shafts produced by a certain process are nonconforming but can be re-worked (rather than having to be scrapped). Consider a random sample of 200 shafts, and let X denote the number among these that are nonconforming, what is the (approximate) probability that X is:
a. At most 30b. Less than 30c. Between 15 and 25 (inclusive)
Consider the following data on distances traveled by people to visit the local amusement park and calculate the relative frequency for the shortest distance.
A researcher wants to see whether the stress of final exams elevates the blood pressure of freshman women. When they are not under any unusual stress, healthy 18 year olds have a systolic blood pressure that averages mean of 120 mm Hg with a stand..
How many students must be randomly selected to estimate the mean weekly earnings of students at one college?
Describe the five steps of hypothesis testing. Compare Type I and Type II errors and give specific examples for each. Which error should be minimized the most and first?
Please discuss an application of ANOVA that might be undertaken in a workplace. What are the 3 or more treatments? What is the response variable?
Compute the confidence intervals of your data from the Week 4 Learning Team paper. Based on your confidence intervals.
When we say we have confidence level of 95% what do you believe our "margin of error" is?
A filling machine in a brewery is designed to fill bottles with 355 ml of hard cider. In practice, however, volumes vary slightly from bottle to bottle. In a sample of 49 bottles, the mean volume of cider is found to be 354 ml, with a standard dev..
Operators are to answer telephone calls from customers in an average time of 0.1 minute or less, and either respond to or refer to the proper department within 0.5 minute.
In a particular region of Cape Cod, it is known that lobstermen trap on average of 32 pounds of lobster per day with a standard deviation of four pounds.
You've administered a standardized test of manual dexterity to two groups of 10 semi skilled workers. One of these two groups of workers will be employed by you to work in a warehouse with many fragile items.
Fit a linear regression model for bp against sodium. Do you think this is a model with a good fit? Why?
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