For years, the Brite Lite Company has made light bulbs that have had an average
ID: 3435374 • Letter: F
Question
For years, the Brite Lite Company has made light bulbs that have had an average lifespan of 800 hours of use. Recently, some changes were made in the design and the production of the light bulbs. It is thought that the lifespan of the light bulbs has been increased by the changes. A random sample of 55 new light bulbs is selected and tested. The sample average bulb life is 910 hours with sample standard deviation 126 hours. Does this indicate that the population mean bulb life has increased? The correct hypothses for this test are
HO: mu = 800
HA: mu = 910
HO: mu = 800
HA: mu > 800
HO: mu = 800
HA: mu < 800
HO: mu = 910
HA: mu = 800
HO: mu = 800
HA: mu = 910
HO: mu = 800
HA: mu > 800
HO: mu = 800
HA: mu < 800
HO: mu = 910
HA: mu = 800
Explanation / Answer
HO: mu = 800
HA: mu < 800
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.