Calculate the test statistic for any 3 of the 4 scenarios. (a) The average height of all employees at a company is 158cm. You are trying to determine if your department's employees are taller than the average. A sample of 20 employees has a mean height of 160cm and a standard deviation of 8.1cm. (b) In one population, 25% of drivers have admitted to glancing at their phone in the car. To reduce this issue, a campaign was launched to try to reduce this with advertising aimed at this population. A sample of 50 drivers after the campaign had 9 admit to still having done this. (c) An internet provider surveyed their clients and expected to have a uniform (equal) distribution of responses across the 4 options below. The number of responses were recorded below for a sample of 100 clients. Test whether or not the data is approximately equal at a 0.05 level of significance. Response Frequency Great 28 Good 27 Not Good 25 Needs Improvement 20 (d) The average monthly salary for one company is $6000 with a standard deviation of $1200. A sample of 36 individuals finds that their mean monthly salary is $5300