A survey contained the following set of instructions and questions for parents of honour$-$

roll students:

Wearing school uniforms helps keep trespassers from causing problems in the school.

$>$ Would you be in favour of changing the school dress code to introduce

uniforms for all students so that proper discipline can be enforced?

$>$ Other dress code changes may or may not have positive effects on student

discipline. Do you have any other suggestions for dress code changes?

$>$ Please enter your name and phone number:

a$)$ Identify the types of bias in the survey.

b$)$ What types of answers is the author of this survey attempting to elicit?

c$)$ Suggest improvements to eliminate bias.