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a. Nonpregnant women have an average fasting blood glucose level of about 80 mg/100mL of blood....

a. Nonpregnant women have an average fasting blood glucose level of about 80 mg/100mL of blood. Researchers want to determine if pregnancy causes a change in blood glucose level. They take a random sample of 25 third trimester women and find their average fasting blood glucose level is 75 mg/100mL with sample standard deviation of 9.68. Find 90% and 95% confidence intervals for average fasting blood glucose level of third trimester women.

b. Repeat the previous question, but this time it is known that the true standard deviation is σ = 9.68.

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