Question

In: Math

We considered the change in the number of days exceeding 90'F from 1948 and 2018 at 197 randomly sampled locations from the NOAA database in Exercise 7.19.


7.21 Global warming, Part II. 

We considered the change in the number of days exceeding 90'F from 1948 and 2018 at 197 randomly sampled locations from the NOAA database in Exercise 7.19. The mean and standard deviation of the reported differences are 2.9 days and 17.2 days. 

(a) Calculate a 90% confidence interval for the average difference between number of days exceeding 90°F between 1948 and 2018. We've already checked the conditions for you. 

(b) Interpret the interval in context. 

(c) Does the confidence interval provide convincing evidence that there were more days exceeding 90F in 2018 than in 1948 at NOAA stations? Explain.

Solutions

Expert Solution


Related Solutions

A climate study compared temperature differences in 1948 vs. 2018. Scientists sampled 197 locations from the...
A climate study compared temperature differences in 1948 vs. 2018. Scientists sampled 197 locations from the National Oceanic and Atmospheric Administration’s (NOAA) historical data, where the data was available for both years of interest. The scientists wanted to know: were there more days with temperatures exceeding 90°F in 2018 or in 1948? For each of the 197 locations, they calculated the difference in number of days exceeding 90°F (number of days in 2018 – number of days in 1948). The...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT