The head circumference is measured for a sample of 17 girls and a separate sample of 12 boys. The mean for the girls was 49 cm with a standard deviation of 1.25 cm. The mean for the boys was 50 cm with a standard deviation of 0.95 cm. What is the value of the pooled standard error for the difference in mean head circumference between girls and boys?
a. 0.41
b. 1.29
c. 0.43
d. 1.14
Question 2
For each study, decide if the two samples are independent samples or paired samples. In a random sample of 100 students (60 women and 40 men), the average hours of sleep during finals week were compared.
a. Independent samples
b. Paired samples
