In: Statistics and Probability
A manufacturer has tested the time taken to manufacture a fixed
number of
working components, measuring the times in units of 103
seconds. The
resulting data values are shown in Dataset as a frequency
distribution.
Carry out an appropriate statistical test to determine if this data
may be
said to have a normal distribution. Identify any questions
around
identifying the number of degrees of freedom for the relevant
test.
| Groups | Frequencies | ||
| 300 | to | 305 | 10 |
| 305 | to | 310 | 13 |
| 310 | to | 315 | 35 |
| 315 | to | 320 | 77 |
| 320 | to | 325 | 77 |
| 325 | to | 330 | 36 |
| 330 | to | 335 | 13 |
| 335 | to | 340 | 10 |
| 340 | |||