Question 1 Production Rates A manufacturing company wishes to find out whether the productivity of its workforce has increased now that they have a new machine. The factory examined the records for a random sample of 8 hours over the past month. The hourly production rates for these 8 hours were:

142 175 162 158 190 154 160 185

Suppose the production rate before the use of the new machine is 155 units per hour. Test at 10% if the new machine has increased workers' productivity on average using the critical value approach.