'1 ------- 7 Data available regarding the marks in a particular Statistics course shows an average of 68% . professor hypothesizes that in her class the marks have increased due to the introduction of a s pop up quizzing system that encouraged consistent study over the semester. To test the hypothu sample of 23 students are selected and their marks are recorded. It is found that the mean of th sample studied was 72%, with a standard deviation of 14%. Use a 5% level of significance. Is there statistical evidence of an increase in marks after the quizzing system was introduced? a) State the appropriate test (Type 2 or t) [1 mark] b) State the null hypothesis Which is correct: a)H0 : p, = 68% b) H 0 : p. = 72% c)H0 2/1 > 68% d)H0 Z [L 68% C)HA : p,