A random sample of 100 high school students was surveyed regarding their favorite subject. The following counts were obtained: Favorite Subject English Number of Students 25 Math 30 Science 30 Art/Music 15 The researcher conducted a test to determine whether the proportion of students was equal for all four subjects. What is the value of the test statistic? a. 0 b. 25 C.6 d. -4 How many degrees of freedom does the chi-square test statistic for a goodness of fit have when there are 10 categories? . 74 b. 7 C.9 d. 62