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Quality control is an important issue at ACME Company which manufactures light bulbs. In order to conduct testing of the life hours of their light bulbs, they randomly sampled nine light bulbs and measured how many hours they lasted (mean = 346.6). 378, 361, 350, 375, 200, 391, 375, 368, 321 What is the variance?
Bob gets tests grades of 86, 92, and 60 He gets an 90 on his final exam. Find the weighted mean if each tests counts for 20%, and the final exam counts for 40% of the final grade.
The remaining 5 were not given the overview. Here are the scores for students in each group:
The United States Postal Service reports that 95 percent of first class mail within the same city is delivered within two days of the time of mailing. Six of the letters are randomly sent to different locations.
nearly every aspect of our lives is impact by waiting on lines queues including grocery stores waiting at red lights
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot. What is the standard deviation for the sample proportion?
Calculate the 95% confidence interval for the population proportion of patients who are successfully treated. (c) Write a sentence that correctly interprets this interval.
Get a test statistic and p -value. Interpret results at α = .01.
A sample of 81 account balances of a credit company showed an average balance of $1,200 with a sample standard deviation of $126. You want to determine if the mean of all account balances is significantly different from $1,250. Use a .05 level of ..
What is the probability that the mean breaking strength of the 3 untreated specimens is at least 25 pounds greater than the mean strength of the 3 treated specimens?
Determine payback period for implementing Oracle Discoverer? Assume that WebFocus will be in-place until December 31 and the migration to Oracle will be done concurrently and is expected to be completed and operational by Dec 31 as well.
Determine what analysis would you do on each problem (ie, one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
many educators feel their grades should fit a normal distribution and often apply curves to make them fit one. one way
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