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A. When investigating the distribution of a data set, which is more effective: a frequency distribution or a histogram? Why?
b. A quality control engineer redesigns repair procedures so that the standard deviation of the repair times is reduced. Does this imply that the repairs are being done in less time? Why or why not?
A better case can be made that observation 13 (Los Arboles) is an outlier. Describe what this means in plain terms.
What is it that differentiates a binomial probability distribution from any other probability distribution? & The employees at a General Motors assembly plant are polled as they leave work.
95% of breaking strengths will be contained between what two values symmetrically distributed around mean?
Construct a payoff table for Mountain Ski's decision problem of how many pairs of skis to order. What is the best decision from an expected value basis?
Describe the standard normal distribution. Explain why it can be used to find probabilities for all normal distributions.
The width of a confidence interval will be:
You take a random sample and perform a hypothesis test, getting a p-value of 0.2578. What is the appropriate conclusion? Conclude at the 5% level of significance.
Using the .10 level of significance, can we conclude that the assembly time using the new method is faster?
Data on distribution of cost for building effort, design work and testing effort.
Show some work for each part. A diagram can be helpful. A survey of adults found the following: 65 percent of the adults drink coffee. 35 percent drink tea. 80 percent drink coffee or tea (or both). If we choose a surveyed adult at random, find t..
Obtain a test statistic and p -value assuming equal variances. Interpret these results.
A random sample of 52 groups gave a mean of $8.30 with a standard deviation of $2.42. Find a 90% confidence interval for the mean amount left by all groups.
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