Assignment:
The Penn Oil Company wished to verify the viscosity of its premium 30-weight oil. A simple random sample of specimens taken from automobiles running at normal temperatures was obtained. The viscosities observed were as follows:
| 25 |
24 |
21 |
35 |
25 |
| 25 |
35 |
38 |
32 |
36 |
| 35 |
29 |
30 |
27 |
28 |
| 27 |
31 |
32 |
30 |
30 |
Determine if the median viscosity at normal running temperatures is equal to 30 as advertised for Penn’s premium 30-weight oil. (Use α = 0.05.)
Provide complete and step by step solution for the question and show calculations and use formulas.