The Glen Valley Steel Company manufactures steel bars. if the production process is working properly, it turns out steel bars that are normally distributed with mean length of 2.6 feet. Either longer steel bars or shorter bars must be scrapped. The research department is wondering if the company should adjust the production equipment. A random sample of 24 bars was selected, and the mean length is 2.37 feed with the variance of 0.09 feet.

Show all steps:

1) State Null/Alternative hypothesis

2) Calcuate the test statistics (T table or Z)

3) Find P-Value using appropriate table: Draw normal curve and highlight corresponding area

4) At .05 Significance level do you reject or retina null hypothesis

5) At .01 significant level do you reject or retain null hypothesis