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 |