Exercise 2: Formulate the appropriate null and alternative hypothesis in the following situations, then write in symbols. 1. A pharmaceutical company says that the efficacy rate of their medicine is 90% and the standard deviation is 2%. A sample of 500 volunteers from a city reveals that the efficacy rate is 88% with a standard deviation of 3%. At 1% significance level, check the veracity of the statement of the company. 2. A remittance center claims that the average transaction cost of sending money : +1