A clothing company wants to determine how far customers travel to visit their stores. A sample of 15 customers revealed that they traveled a mean of 17 kilometers with a samplestandard deviation of 1.8 km. Develop a 95% confidence interval for the populationmean distance traveled.

What is the t-value?

Select one:

a.

2.145

b.

2.624

c.

1.96

d.

2.977