1. We ask if the attitudes toward fuel cost of 100 owners are hybrid electric cars (X=76) are different from those on a national survey of owners of non-hybrid cars (µ=65,σ_x=24). Higher scores indicate a more positive attitude. A) Is this a one or two tailed test? B) In words what is the H₀ and H_a? C) Perform the z-test. D) What do you conclude about the attitudes here? E) Report your results in the correct format.

2. We measure the self esteem scores of a sample of statistics students, reasoning that this course may lower their self esteem relative to that of the typical college student (µ=55 and σ_x=11.35) We obtain these scores:

44    55    39   17   27   38    36   24   36

A) Summarize your sample data. B) Is this a one tailed or two tailed test? Why? C) What are the H₀ and H_a?    D) Compute z_obt  E) With α = .05 what is z_crit? F) What should we conclude about the relationship here?