Thomas collected 29 responses to a survey and used a two-tailed test to establish a significance level of 0.20 and calculate a 90% confidence interval. Using the t-table (located in the tutorial), what is the critical t-value used for calculating a 90% confidence interval with 28 degrees of freedom? Answer choices are rounded to the thousandths place.

• a.)2.467
• b.)1.701
• c.)1.699
• d.)1.311