4. A pharma company you work for makes jars with cream. It claims that the average amount of cream in a jar is at least 90 g. To prove that claim to the customers you decide to test the claim at a significance level (alpha) of .05. You randomly sample 25 jars of cream made by the company and find the sample mean to be 92.5 g with a sample standard deviation of 5.5 g. Now you need to analyze that data. (a) What are the null and alternative hypotheses you'll choose? Think about this - it is here that many students make an error! (b) Draw the picture of the distribution of the test statistic (under HO). Include critical value(s) and region(s) of rejection. (c) What is the calculated (computed) value of the test statistic? (d) What is your conclusion?