In a famous article (S. Russell, "A red sky at night... ," Metropolitan Magazine London, 61, p. 15, 1926) the following data set of frequencies of sunset colors and whether each was followed by rain was presented
|
Sky Color
|
Number of Observations
|
Number Followed byRain
|
|
Red
|
61
|
26
|
|
Mainly red
|
194
|
52
|
|
Yellow
|
159
|
81
|
|
Mainly yellow
|
188
|
86
|
|
Red and yellow
|
194
|
52
|
|
Gray
|
302
|
167
|
Test the hypothesis that whether it rains tomorrow is independent of the color of today's sunset.