A study was conducted to determine if the salaries of librarians from two neighboring cities were equal. A sample of 15 librarians from each city was randomiy selected. The mean from the first city was $28,900 with a standard deviation of $2300. The mean from the second city was $30,300 with a standard deviation of $2100. What hypoifesir tin would be used to test that avenge salaries for librarians from the two netiglhering cities are equal? a. Hypothesis test of two population proportions b. Analysis of Variance (ANOVA) c. Hypothesis test of two dependent means (paired t-test) d. Hypothesis test of two independent means (pooled t-test)