Don't need explanation just the answers please and thank you!
a) Explain why the researcher may be wrong and the duration may be skewed to the left. Choose the correct answer below. A. Each pregnancy a woman has becomes shorter than the previous, so women with multiple children contribute more to shorter pregnancies. O B. The actual mean duration of the average pregnancy is slightly less than 263 days. O C. There are more premature births than very long pregnancies. Modern practice of medicine stops pregnancies at about 2 weeks past normal due date. O D. Some women are not immediately aware of when they become pregnant, producing smaller durations than expected. b) The researcher finds that 18.6% of pregnancies should last from 267 days to 277 days. If the correct model for the duration of pregnancies is in fact skewed, does that change this finding? A. Yes, the Normal model cannot be used if it's very skewed. B. No, the Normal model can still be used because this range is less than the standard deviation. O C. No, the Normal model can still be used because this range is to the right of the mean, which shape does not change. O D. No, the Normal model can still be used because this range is close to the mean. c) The researcher finds that the longest 25% of pregnancies should last 275.8 days or more. If the correct model for the duration of pregnancies is in fact skewed, does that change this finding? O A. Yes, the Normal model cannot be used if it's very skewed. O B. No, the Normal model can still be used because this is a percentage, which is not effected by a skewed model. C. No, the Normal model can still be used because this value is within one standard deviation of the mean. O D. No, the Normal model can still be used because this finding refers to values to the right of the mean, which shape does not change. d) Suppose a certain obstetrician is currently providing prenatal care to 60 pregnant women. Let y represent the mean length of their pregnancies. The researcher assumes that the distribution of this sample mean, y, is a Normal model with mean of 263 days and standard deviation of 2.45 days. If the correct model for the duration of pregnancies is in fact skewed, does that change this finding? O A. Yes, the Normal model cannot be used because this sample distribution is very skewed. B. No, this is a sample distribution that is independent of the population distribution. O C. No, the Central Limit Theorem guarantees a Normal model for this large sample size. O D. Yes, the Normal model cannot be used for a sample distribution if the population model is very skewed
