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Question 1[5 marks] The National Safety Council would like to estimate the proportion of vehicle accidents that are pedestrian related. In a sample of 128 vehicle accidents in Johannesburg it is found that 30 of them involved pedestrians. 1.1 Calculate the proportion of vehicle accidents that are pedestrian related. [1 ] 1.2 Calculate the estimated standard error for this sampling distribution. [1] [1 ] 1.3 The 99% confidence interval corresponds to z limits of (a) +1.96 (6) + 1.645 (c) +2.576 (d) +2.327 1.4 Construct a 99% confidence interval for the proportion of accidents that involve pedestrians. [2]