Researchers at a National Weather Center in the north-eastern United States recorded the number of 900 days each year since records first started in 1875. The numbers form a normal shaped distribution with a mean of µ = 9.6 and a standard deviation of o 1.9. To see if the data showed any evidence of global warming, they also computed the mean number of 900 days for the most years and obtained M = 12.25 . Do the data indicate that the past four years recent n = 4 have had significantly more 900 days than would be expected for a random sample from this population? Use a one-tailed test with a = .05.

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Researchers at a National Weather Center in
the north-eastern United States recorded the
number of 900 days each year since records
first started in 1875. The numbers form a
normal shaped distribution with a mean of
µ = 9.6 and a standard deviation of o
1.9.
To see if the data showed any evidence of
global warming, they also computed the
mean number of 900 days for the most
years and obtained M = 12.25 .
Do the data indicate that the past four years
recent n = 4
have had significantly more 900 days than
would be expected for a random sample
from this population? Use a one-tailed test
with a = .05.
Transcribed Image Text:Researchers at a National Weather Center in the north-eastern United States recorded the number of 900 days each year since records first started in 1875. The numbers form a normal shaped distribution with a mean of µ = 9.6 and a standard deviation of o 1.9. To see if the data showed any evidence of global warming, they also computed the mean number of 900 days for the most years and obtained M = 12.25 . Do the data indicate that the past four years recent n = 4 have had significantly more 900 days than would be expected for a random sample from this population? Use a one-tailed test with a = .05.
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