ASSESSMENT 2

1008GBS Business Decision Making T1 2023 Comment on change in market share between 2018 and 2022: The change in market share between 2018 compared to 2022 shows that all brands decreased slightly. Whereas Nissan and Honda drastically dropped after the pandemic, while Kia and Toyota rose in total sales. List the top 5 brands in 2018 and 2022 and discuss advice to Brian (in order) 2018: Toyota, Mazda, Hyundai, Mitsubishi, Ford 2022: Toyota, Mazda, Kia, Mitsubishi, Hyundai Toyota consistently grows and Kia had the greatest increase after covid. (g) Justification for the choice of chart:   Nissan, Volkswagen, and Honda declined by the year, representing the vehicle brands becoming less popular, as other companies increase in strong demand. There should be a change in what he sells due to this comparison, as well as the top 5 brands chosen above as the best option. Chart: MODEL 3 BAR GRAPH (without outlier year) Toyota Mazda Hyundai Mi tsubishi Ford Kia Nissan Volkswagen Honda Subaru 0.00 50,000.00 100,000.00 150,000.00 200,000.00 250,000.00 Top 10 best brands of passenger vehicles in 2018-2022 2018 2022 Total sales Comment on the chart: 2020 compared to 2018 shows that covid did impact the quantity of sales, however helped to show what brands are the most reliable for uncertain circumstances. Model 3 represents the data without the outlier of the year 2020 where the data was not reliable, showing a more clear trendline of the years that count. 3

1008GBS Business Decision Making T1 2023 Step 4 (define decision rule) Decision rule for a right-tail test: Reject Ho if t-test value is > t critical value (otherwise do not reject Null (Ho) Step 5 (Calculate the value of the test statistic or p-value) Choose the correct worksheet in the Test Statistics.xlsx workbook and enter the required entries in the grey shaded cells Sample mean = 0.411 Sample standard deviation = 0.513677 Sample size = 699 T-test of a mean Sample mean (Xbar) 0.411 T stat 21.14 Sample standard deviation (s) 0.513677 P(T<=t) one-tail 0.0000 Sample size (n) 699 t Critical one-tail 1.6470 Hypothesized mean ( μ ) 0 P(T<=t) two-tail 0.0000 Alpha ( α ) 0.05 T Critical two-tail 1.9634 Step 6 (Compare the values from the output using the Decision rule and reject or do not reject the alternative hypothesis. State your conclusion which should answer the research question) Reject Ho since: 21.12> 1.6470 (c) Justification for the choice of chart: Scatterplots are visually easy to read to determine the relationship between the two variables (CO2 levels) and (temperature anomalies). As well as the different coloured trend line to predict the trend movement. Chart: include the trend line and the Model 2 6