7 Ten years ago the residents in a car congested area were asked whether they were in
favour of a residents' parking scheme. The proportion of residents who supported the
parking permit scheme was 30%. The scheme was never implemented due to lack of
funding
The funding is now available and a new councillor believes that the support for the
scheme is different now.
The replies to questionnaires of twenty current residents are considered.
a) Determine the critical region to test, at the 5% level of significance, the
councillor's belief.
b) State the actual significance level for a test using the critical region of part (a).
Ten residents in support of the scheme were found in the sample.
c) Complete the test.​