Question: Results from the 2001 population census in Wales found that DVD watching was normally distributed and university students watched an average of 6.8 DVD's per month, with a standard deviation of 0.5. A recently conducted survey amongst a randomly selected sample of 36 university students in Wales revealed that the mean number of DVD's they watched was 6.2 per month. At the 0.05 significance level can we conclude that Welsh university students are now watching fewer DVD's than before?

(a) State the Null & Alternate Hypotheses

(b) Formulate the decision rule

(c) Decide upon the test statistic & calculate it – showing your calculations clearly

(d) Say if you reject or do not reject the Null Hypothesis