The Manager of the Quality Department for a Tire Manufacturing

The manager of the quality department for a tire manufacturing company wants to know the average tensile strength of rubber used in making a certain brand of radial tire. The population is normally distributed and the population standard deviation is known. The manager uses a z test to test the null hypothesis that the mean tensile strength is 800. The calculated z test statistic is a positive value that leads to a p-value of .045 for the tes
-For a hypothesis test about a population mean,if the level of significance is less than the p-value,the null hypothesis is rejected.