Motor vehicles have a recommended tire pressure of 32 psi (pounds per square inch). Theroad safety authority launches a roadside checkpoint to measure the actual tire pressure in thefront left tire of a random sample of 50 passing cars. The authority hopes to use thisinformation to decide whether an additional investment in air pumps is required at fillingstations.(a) Define the population characteristic of interest in the above example. (2 marks)(b) The following SPSS output has been produced from a one sample t-test. Using the 5-stepapproach to hypothesis testing, determine whether the road safety authority should invest inadditional air pumps at filling stations. (7 marks)
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