The mean ±1 sd of ln [calcium intake (mg)] among 25 females, 12 to 14 years of age, below the poverty level is 6.56 ± 0.64. Similarly, the mean ± 1 sd of ln [calcium intake (mg)] among 40 females, 12 to 14 years of age, above the poverty level is 6.80 ± 0.76. *8.7 Suppose an equal number of 12- to 14-year-old girls below and above the poverty level are recruited to studydifferences in calcium intake. How many girls should be recruited to have an 80% chance of detecting a significant difference using a two-sided test with α = .05? *8.8 Answer Problem 8.7 if a one-sided rather than a twosided test is used. *8.9 Using a two-sided test with α = .05, answer Problem 8.7, anticipating that two girls above the poverty level will be recruited for every one girl below the poverty level who is recruited.
The mean ±1 sd of ln [calcium intake (mg)] among 25 females, 12 to 14 years of age, below the poverty level is 6.56 ± 0.64. Similarly, the mean ± 1 sd of ln [calcium intake (mg)] among 40 females, 12 to 14 years of age, above the poverty level is 6.80 ± 0.76.
*8.7 Suppose an equal number of 12- to 14-year-old girls below and above the poverty level are recruited to studydifferences in calcium intake. How many girls should be recruited to have an 80% chance of detecting a significant difference using a two-sided test with α = .05?
*8.8 Answer Problem 8.7 if a one-sided rather than a twosided test is used.
*8.9 Using a two-sided test with α = .05, answer Problem 8.7, anticipating that two girls above the poverty level will be recruited for every one girl below the poverty level who is recruited.
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