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Author Question: The head circumference is measured for a sample of 15 girls and a separate sample of 15 boys. What ... (Read 115 times)

kfurse

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on: Jul 24, 2018
The head circumference is measured for a sample of 15 girls and a separate sample of 15 boys. What is the correct combination of degrees of freedom and the value of the multiplier t for a 90 confidence interval for the difference in mean head circumference between girls and boys?
 a. df = 13, t = 1.77
  b. df = 28, t = 1.70
  c. df = 28, t = 2.05
  d. df = 30, t = 1.70

Question 2

For each study, decide if the two samples are independent samples or paired samples. A group of 100 students were randomly assigned to receive vitamin C (50 students) or a placebo (50 students). The groups were followed for 2 weeks and the proportions of students with colds were compared.
 a. Independent samples
  b. Paired samples


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dominiqueenicolee

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Reply #1 on: Jul 24, 2018
Answer to Question 1

D

Answer to Question 2

A


kfurse

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Reply 2 on: Jul 24, 2018
Great answer, keep it coming :)

milbourne11

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Reply 3 on: Yesterday
Wow, this really help

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