Estimation problems

1. 6.7 The data in the table below on left ventricular ejection fraction (LVEF) were calculated from a group of 27 patients with acute dilated cardiomyopathy. Calculate the standard deviation for LVEF for these patients.
   
2. (6.8 ) Calculate the standard error for the mean of left ventricular ejection fraction.
3. Calculate a 95% confidence interval (C.I.) for the mean LVEF
4. Calculate a 90% confidence interval for the mean LVEF

2 The data set LEAD is given in excel format. Children were classified according to blood lead level in 1972 and 1973 by the variable GROUP, where 1 equal blood level < 40 µg /100 mL in both 1972 and 1973, 2 = blood level greater or equal to 40 µg/ 100 mL in 1973, 3 = blood lead level greater than or equal to 40 µg per 100 mL in 1972, but less than 40 µg per 100 mL in 1973.

1. (6.78) Compute the mean, standard deviation and standard error and the 95% confidence interval for the mean verbal IQ for children with specific values at the variable GROUP. Provide a box plot comparing the distribution of verbal IQ are subject GROUP = 1, 2, and 3. Summarize your findings concisely.
2. 6.79 Answer Problem # 2(1) for performance IQ.
3. 6.80 Answer Problem #2(1) for full-scale IQ.

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Solution: The downloadable solution consists of 12 pages, 589 words and 7 charts.
Deliverable: Word Document