(a) State the null hypothesis and the alternate hypothesis.

(c) Compute the value of the test statistic.

(b) State the critical value

(d) Accept or Reject H0?

(e) Your conclusion based on the question posed in the exercise.

The powdered chlorine added to swimming pools to combat algae has a relatively short shelf life before it loses its effectiveness.Records indicate that the mean shelf life of a 5-gallon jug of chlorine is 2,000 hours.A new ingredient, Cobalt, was added to the chlorine toincrease the shelf life.A sample of twenty jugs of chlorine was tested & the mean was 2050 hours with a population std dev of 100 At the .02level of significance, has the Cobalt increased the shelf life of the chlorine?

Ho:

H1:

z =

z=

Ho is:

Conclusion: