17 Suzanne is a member of a sports club.
For each sport she competes in, she wins half of the matches.
17
- After buying a new tennis racket Suzanne plays 10 matches and wins 7 of them.
Investigate, at the \(10 \%\) level of significance, whether Suzanne's new racket has made a difference to the probability of her winning a match.
17 - After buying a new squash racket, Suzanne plays 20 matches. Find the minimum number of matches she must win for her to conclude, at the \(10 \%\) level of significance, that the new racket has improved her performance.