For the following scenarios, state the null hypothesis and the alternative hypothesis to be used when a hypothesis test is performed. Scenario i) A programmer has been told that the mean time to apply a particular update to a server is 1.7 hours. They believe the value is greater than this. They apply the update to 36 servers and compute a mean update time of 1.85 hours with a standard deviation of 0.64 hours. Scenario ii) It typically takes a tomato plant 110 days to fully mature. A scientist has created a new breed of tomato and wants to test whether the mean maturity time is different than that. They sample 31 plants and compute a sample mean of 106.4 days with a sample standard deviation of 8.2 days. Scenario iii) A computer scientist believes that fewer than 80% of coders adequately document their code. They sample code from 250 coders and find that 190 of them adequately documented their code.
For the following scenarios, state the null hypothesis and the alternative hypothesis
to be used when a hypothesis test is performed.
Scenario i) A programmer has been told that the
a server is 1.7 hours. They believe the value is greater than this. They apply the
update to 36 servers and compute a mean update time of 1.85 hours with a standard
deviation of 0.64 hours.
Scenario ii) It typically takes a tomato plant 110 days to fully mature. A scientist has created a
new breed of tomato and wants to test whether the mean maturity time is different
than that. They sample 31 plants and compute a sample mean of 106.4 days with a
sample standard deviation of 8.2 days.
Scenario iii) A computer scientist believes that fewer than 80% of coders adequately document
their code. They sample code from 250 coders and find that 190 of them adequately
documented their code.
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