Hematocrit levels (g/dL) from healthy term infants form a normal distribution withm = 61 ands = 7. Several studies have shown that the risk of anemia (indicated by low hematocrit levels) is decreased with late cramping of the umbilical cord. Using clinical data, a researcher measured hematocrit levels from a sample of n = 100 healthy term infants with late cord cramping. The average hematocrit level (g/dL) for this sample wasx= 60. Do these data indicate that late cord cramping has a significant effect on hematocrit levels? Test withp=.05.

Note

= population mean

x = sample mean

s = standard deviation

Questions

1. State the null hypothesis in written and mathematical format?

2. State the alterative hypothesis in written and mathematical format?

3. Based on information in the scenario, what is the level of significance to be used?

4. Based on thelevel of significance (Question 3) and whether your alternative hypothesis is directional or non-directional, what is your decision rule? (In other words, what is your rejection region?)

5. Calculate the z statistic. Please show your work.

6. Do you reject or fail to reject the null hypothesis?

7. Does late cord cramping affect the hematocrit levels of healthy term infants?