4. Consider an experiment to determine the effect of a single factor that can he set to o. levels. At each factor setting 11 measurements of the quality characteristic are taken. The 3"" measurement of the qualit}r characteristic at factor level i is denoted y. What is the number of degrees of freedom of 335\"\"? Show your calculations. Merely,r stating the answer, which can he found in the text, will not get an},F credit