In 1930,the Average Size of a Public Restroom Was 172

Multiple Choice

In 1930,the average size of a public restroom was 172 square feet;by 1990,due to federal disability laws,the average size had increased to 471 square feet.Suppose that a design team believes that this standard has increased from the 1990 level.They randomly sample 23 public restrooms in a major Midwestern city and obtain a mean square footage of 498.78 with a standard deviation of 46.94.Calculate the appropriate test statistic to test the hypotheses.

A) 2.84
B) 13.61
C) 30.34
D) -2.84
E) -13.61