The increasing levels of global warming has led to climate pattern changes all over the world. The average number of yea

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The increasing levels of global warming has led to climate
pattern changes all over the world. The average number of yearly
storms in a random sample of tropical countries during the 30 year
period 1961-1990 was 94 with a standard deviation of 25, while the
average number of yearly storms in a random sample of tropical
countries during 1991-2020 was 123 with a standard deviation of 32.
A climatologist is interested to gather evidence regarding whether
the average number of storms have increased in 1991-2020 as
compared to 1961-1990. To this purpose she decided to do a t-test.
To test her claim she obtains the test statistic and the
p-value
a.) The t-statistic equals 1.01 and p-value equals
(1-t.dist(1.01,df,1)). Assume that the df is the correct answer
from the previous question.
b.) The t-statistic equals 1.01 and p-value equals
2*(1-t.dist(1.01,df,1)). Assume that the df is the correct answer
from the previous question.
c.) The t-statistic equals 3.91 and p-value equals
2*(1-t.dist(3.91,df,1)). Assume that the df is the correct answer
from the previous question.
d.) The t-statistic equals 3.91 and p-value equals
(1-t.dist(3.91,df,1)). Assume that the df is the correct answer
from the previous question.