A machine in a fruit canning factory puts quantities of sliced peaches into tins. The machine is set so that the mean mass of the contents is 120.4 g. The machine breaks down and after repair, six tins are selected and their contents weighted. The weights of the contents were, in grams:

122.1 119.9 121.3 119.4 121.7 120.9 Stating any necessary assumptions and using a 10% significance level, test the hypothesis that the population mean is now greater than 120.4 g.

Ho:

Ha:

Type of test:

Level of significance:

Appropriate test statistic: z test or t-test

Appropriate formula:

Test statistic value or computed value

Critical value/s or table value/s

Decision

Conclusion