Use the Following Information for Questions:
an Airport Official $µ_1$

Multiple Choice

Use the following information for questions:
An airport official wants to assess if the flights from one airline (Airline 1) are less delayed than flights from another airline (Airline 2) . 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 9.5 minutes delay with a standard deviation of 3 minutes. A random sample of 10 flights for Airline 2 shows an average of 12.63 minutes delay with a standard deviation of 3 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 are the appropriate null and alternative hypotheses?

A) H₀: $µ_1$ - $µ_2$ = 0 and H_a: $µ_1$ - $µ_2$ $\neq$ 0
B) H₀: $µ_1$ - $µ_2$ $\neq$ 0 and H_a: $µ_1$ - $µ_2$ = 0
C) H₀: $µ_1$ - $µ_2$ = 0 and H_a: $µ_1$ - $µ_2$ < 0
D) H₀: $µ_1$ - $µ_2$ = 0 and H_a: $µ_1$ - $µ_2$ > 0