There is a tournament in table tennis (ping-pong) in which 8 players take place.
these are the rules of the tournament:
1 ) each player plays with every other only 1 game.
2 ) if in the i-th round there is a game between a and b, and a game between c and d, and in the i+1-th round there is a game between a and c, then in the i+1-th there must be a game between b and d.
on how many different ways can we make a schedule for all rounds if it's not important which player plays on which table?

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?