1. Suppose that we have this verbal formulation of a research hypothesis: \"The
ID: 3328931 • Letter: 1
Question
1. Suppose that we have this verbal formulation of a research hypothesis: "The research hypothesis for this study is that the mean rating, scored as 0 (too poor to drive on) to 100 (firm and smooth), for the surface quality of streets in this sample's parent population of mid-sized cities is under 75." Which is the correct symbolic hypothesis to go with it?
A. HA: µ > 75
B. HA: µ = 75
C. H0: µ = 75
D. HA: µ < 75
E. H0: µ < 75
F. H0: µ > 75
2. On average, little girls are fully toilet trained at 29 months old, but you think that your sample of little girls is drawn from a population that accomplishes this more quickly. Which is the correct type of research hypothesis?
A. a two-sided hypothesis
B. a lower-tailed hypothesis
C. an upper-tailed hypothesis
Explanation / Answer
(1) Ans: D. HA: µ < 75
(2) Ans: B. a lower-tailed hypothesis
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