Geoff has been running a restaurant in the city for many years. he knows from experience that the proportion of customers that leave tips at this restaurant is 0.56. geoff has recently opened a restaurant in a suburban area. it seems that tipping habits are different in the suburbs: geoff believes that the proportion of customers that tip at his new restaurant (p) may be different to 0.56. he conducts a hypothesis test to find out. the null and alternative hypotheses are: h0: p = 0.56 ha: p ≠ 0.56 geoff takes a random sample of 113 customers and notes whether or not they leave a tip. in this sample, the proportion of people that leave a tip is 0.60. a)calculate the test statistic (z). give your answer to 2 decimal places. z = 0.857 b)calculate the p-value. give your answer as a decimal to 4 decimal places. p-value = 0.3898