Suppose You Have a Random Sample of 2,179 Credit Scores $\frac { 620 - 610 } { 70 / \sqrt { 2179 } }$

Multiple Choice

Suppose you have a random sample of 2,179 credit scores from a population of mortgage applicants with a sample mean of 620 and sample standard deviation of 70, and would like to calculate the t-stat for the null hypothesis that the population mean is 610. Which of the following is the correct construction of the t-stat?

A) $\frac { 620 - 610 } { 70 / \sqrt { 2179 } }$
B) $\frac { 620 - 610 } { 70 }$
C) $\frac { 620 } { 70 / \sqrt { 2179 } }$
D) $\frac { 610 - 620 } { 70 / \sqrt { 2179 } }$