psyc3150_exam_2.docx - PSYC3150 Exam 1 – Chapters 7 9 10 1 Name 1 A recent study revealed that the average weight of babies born in the United States

# psyc3150_exam_2.docx - PSYC3150 Exam 1 – Chapters 7 9 10...

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PSYC3150 Exam 1 – Chapters 7, 9, & 10 1 Name:____________________________________ 1. A recent study revealed that the average weight of babies born in the United States is normallydistributed with a mean of 7.5 pounds. This number is lower than recent years and so researchers are interested in determining what factors are associated with lower birth weights. One researcher decides to look at the age of the mother to determine if younger mothers have babies that are significantly heavier or lighter than average. To study this the researcher collects data from 87 babies who were born to mothers between the ages of 16 and 18. Only one baby was measured per mother. Twins and other multiple births were excluded. The average weight for these babies was 7.3 pounds with a standard deviation of .6 pounds. Select the two-tailed null hypothesis for this statistical analysis. A. µ ≠ 7.5B. µ = 7.5C. µ > 7.5D. µ ≠ 7.3E. µ ≤ 7.5F. µ > 7.3G. µ = 7.3H. µ ≤ 7.3 2. What does the number in the numerator of the t-test represent? 3. What do you expect the numerator of the t-test to equal if the null hypothesis is true?
4. What does the number in the denominator of the t-test represent? 5. How can you decrease the denominator of the t -test? A. increase N B. use an alpha of .01 rather than .05 C. use two groups rather than one.

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