13. For the following studies, determine the null and alternative hypotheses and classify thehypothesis test as two tailed, left-tailed or right-tailed.a) A study was conducted comparing the wing lengths of two subspecies of dark-eyedjuncos. One of the subspecies migrates, the other does not. A hypothesis test is to beperformed to decide whether the mean wing length of the non-migratory birds is lessthan that of the migratory birds.b) A half-century ago, the average (U.S.) woman in her 20s was 62.6 inches tall. To see ifwoman tend to be taller, a random sample of 1000 women in their 20s was recentlyconducted and heights were recorded. A hypothesis test is to be performed to decide ifthe mean height of women in their 20s today is greater than that of the women in their20s a half-century ago.
13. For the following studies, determine the null and alternative hypotheses and classify the
hypothesis test as two tailed, left-tailed or right-tailed.
a) A study was conducted comparing the wing lengths of two subspecies of dark-eyed
juncos. One of the subspecies migrates, the other does not. A hypothesis test is to be
performed to decide whether the
than that of the migratory birds.
b) A half-century ago, the average (U.S.) woman in her 20s was 62.6 inches tall. To see if
woman tend to be taller, a random sample of 1000 women in their 20s was recently
conducted and heights were recorded. A hypothesis test is to be performed to decide if
the mean height of women in their 20s today is greater than that of the women in their
20s a half-century ago.
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