Use the Following Information for Questions:
a Bank Official $µ_1$

Multiple Choice

Use the following information for questions:
A bank official wants to assess if the average delays for two airlines are different.Let $µ_1$ = average delay for Airline 1 and $µ_2$ = average delay for Airline 2. A random sample of 10 flights for Airline 1 shows an average of 6 minutes delay with a standard deviation of 5 minutes. A random sample of 10 flights for Airline 2 shows an average of 12 minutes delay with a standard deviation of 5 minutes. Assume delay times are normally distributed, but do not assume the population variances are equal. Use the conservative "by hand" estimate for the degrees of freedom.
-What is the value of the test statistic?

A) t = -2.68
B) t = -1.50
C) t = 1.50
D) t = 2.68