Checkpoint: Two-Way Tables Solutions
The moon is in the sky for 300 nights each calendar year in Pennsylvania. Of the 195 clear nights recorded, there was no moon on 35 nights.
- Create a two-way table.
| Moon (M) | No Moon (M’) | Total | |
| Clear (C) | 35 | 195 | |
| Not Clear (C’) | |||
| Total | 300 | 365 |
- Determine the probability that the night is overcast and there is no moon.
Note
“Overcast” translates to “not clear.”
Q: Is this a two-way table or a joint frequency table? Explain.
A: This is a two-way table because each cell has a total, not a percentage.
Only the final answer is needed in each cell. The work shown is included as a guide.