Maurice Tutor

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    Argosy University/ Phoniex University/
    Nov-2005 - Oct-2011

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    Phoniex University
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Category > Management Posted 13 Oct 2017 My Price 5.00

lifetimes of electronic components,

12.     In a study of the lifetimes of electronic components, a random sample of 400 components are tested until they fail to function. The sample mean lifetime was 370 hours and the standard deviation was 650 hours. True or false:

a.    An approximate 95% confidence interval for the mean lifetime of this type of component is from

306.3 to 433.7 hours.

b.    About 95% of the sample components had life- times between 306.3 and 433.7 hours.

c.    If someone takes a random sample of 400 components, divides the sample standard deviation of their lifetimes by 20, and then adds and sub- tracts that quantity from the sample mean, there is about a 68% chance that the interval so con- structed will cover the mean lifetime of this type of component.

d.    The z table can’t be used to construct confidence intervals here, because the lifetimes of the compo-

 

ii.    one-fourth as wide

iii.    one-half as wide

iv.    the same width

v.    twice as wide

vi.    four times as wide

vii.     eight times as wide

 

Answers

Maurice Tutor
(5)
Status NEW Posted 13 Oct 2017 05:10 PM My Price 5.00

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