I NEED ALL ANSWERS ASAP

Question

(a) give brief explanations for each of the following terms:
(i) random sample
(ii) quota sample

(b) in a sample of 30 chocolate bars, it is found that the mean weight is 100gms.
with a standard deviation of 1.9gms. Construct of 95% confidence interval for the true
mean weight of the chocolate bars

(c) in a survey of 1100 work places. it is found that 935 conform to safety regulations
construct an approximate 95% confidence for the true proportion of work places conforming
to safety regulations

(d) one section of a pharmaceutical manufacturing plant is designed to have a mean
temperature of -10°C. The temperature is measured 19 times over the course of a day and
it is found that the sample mean is -9.7°C, while there is a sample standard deviation
of 0.35°C. Does the evidence indicate (at the 5% significance level) that the mean
temperature is different to -10°C?

Answer 1

As I told @Mairead ,we cannot do your work for you. Next time please ask one question, instead of posting a full test.

Answer 2

Do part of it at least