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- Some Of The Questions Are Already Answered But Maybe It Is Not Correct So Give An Explanation Of Each Answer 1 (39.74 KiB) Viewed 60 times
- Some Of The Questions Are Already Answered But Maybe It Is Not Correct So Give An Explanation Of Each Answer 2 (34.76 KiB) Viewed 60 times
14 1 point Security Systems costs for households are now a significant expense. For 2011 the mean expense per household was $360. Assume a normal distribution with a known standard deviation of $80. If we wanted to have a maximum error of $8, what sample size would we need to draw from the population to be 90% confident in our estimate? 846 376 427 271 000 0
1 0.5 points In a population of Advanced Data Analytics students, it was found that the mean monthly starting salary was $5,000 with a standard deviation of $1200 per month. What is the probability that a sample of 9 people will have an average salary greater than $5500? Assume a normal distribution. 0.1056 0 0 0 0 0.2514 OO 0.3333 0.6667 2 0.5 points A shipment of boards of lumber arrives at a construction site and their lengths are approximately normally distributed with a mean of 10 feet and a standard deviation of 0.14 feet. In testing for consistency of measurement, what would be the probability of finding an average of 9.92 feet or less in a sample of 20 boards? 0.0655 --D 0.0053 0.5038 0.4962