round to the nearest 4 decimals

Consider 3 big car brands (A, B, C), and a small car brand (D) sold at auction. Past records show brands A and C were equally preferred, 34% preferred brand B, and 30% preferred the small brand, D. The owner of the auction believes that there has been a change in customer preferences and that the preference for a small car brand (D) has increased and perhaps will positively contribute to increased profits. Find the value of the appropriate test statistic for testing the change in customer preferences from the past years.

Brand A - 58

Brand B - 66

Brand C - 28

Brand D - 108