A coin operated coffee machine is set to pour 8oz per cup. A random sample of the weights of a number of cups is as follows: 8.4, 8.25, 8.05, 7.84, 7.36, 8.54, 7.56, 7.56, 8.02, 7.39, 8.34, 8.26. Test the hypothesis that the machine is delivering at the level set by the manufacturer. Use a 0.05 level of significance.
Answer (need to confirm if correct or what im doing wrong)
null : mean=8
alternative: mean not equal 8
mean=95.57/12=7.964
therefore fail to reject null
Answer (need to confirm if correct or what im doing wrong)
null : mean=8
alternative: mean not equal 8
mean=95.57/12=7.964
therefore fail to reject null