Quiz: Test 4 (Lec 89) Mai × anvas.unf.edu/courses/28281/quizzes/99062/take Quest

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Quiz: Test 4 (Lec 89) Mai × anvas.unf.edu/courses/28281/quizzes/99062/take Question 27 37.5 pts A small plumbing company wants to track its quarterly expenses. The hypothesis underlying a R-chart for expenses would be: HaR RO: Range of expenses differ from long term (in-control) Range True O False D | Question 28 37.5 pts You should use P charts when each obs represents a sample proportion of the total (for example proportion of defects per sample) but you should use a C-chart if count up defects per day, for example. True False D | Question 29 37.5 pts Six sigma give confidence limits that are 2.96 standard deviations around the population statistic indicating 95% confidence. True False D Question 30 37.5 pts earch

Explanation / Answer

29) False

In statistics, the 68–95–99.7 rule is a shorthand used to remember the percentage of values that lie within a band around the mean in a normal distribution with a width of two, four and six standard deviations, respectively; more accurately, 68.27%, 95.45% and 99.73% of the values lie within one, two and three standard deviations.

So, false

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