Epidemiologists determined that source of an outbreak of food borne illness due to salmonella was ice cream. They sampled 9 production runs from a company that produces ice cream and found that the sample mean and standard deviation of the level of salmonella in ice cream (MPN per gram) were .456 and .2128, respectively. Experience has shown that the level of salmonella is normally distributed, so they did a test of hypothesis to determine whether the mean level of salmonella in ice cream is greater than .
what is the appropriate test of hypothesis?
determine the test statistics and calculate its value.
what is the critical value for this test?
what is the P-value for this test?