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We ask if the attitudes toward fuel costs of 100 owners of hybrid electric cars (X¯= 76) are different from those reported in a national survey of owners of non-hybrid cars ((µ = 65 andsx = 24)

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We ask if the attitudes toward fuel costs of 100 owners of hybrid electric cars (X¯= 76) are different from those reported in a national survey of owners of non-hybrid cars ((µ = 65 ands_x = 24). Higher scores indicate a more positive attitude.

• What is the predicted relationship here?
• Is this a one- or a two-tailed test?
• State the H_a and the H₀.
• Compute z_obt.
• What is z_crit?
• What do you conclude about attitudes here?