Marcus collected 30 responses to a survey and used a two-tailed test to establish a significance level of 0.05 and calculate a 95% confidence interval. Using the t-table (located in the tutorial), what is the critical t-value used for calculating a 95% confidence interval with 29 degrees of freedom? Answer choices are rounded to the thousandths place.

• a.)2.045
• b.)2.462
• c.)2.150
• d.)1.699