Bronchopulmonary dysplasia (BPD) is a chronic respiratory disease that can occur in infants. The data included in bpd.xlsx are from a study of low birth weight infants in a neonatal intensive

care unit. The study was designed to examine the development of BPD by day 28 of life in a sample of 223 infants weighing less than 1750 grams. The data set has the following variables:

• bpd = BPD (1 = yes, 0 = no)
• bweight = birth weight (grams)
• gestage = gestational age (weeks)
• toxemia = mother had toxemia during pregnancy (1 = yes, 0 = no)

The bpd.xlsx data set and SAS will be used to answer the last 4 questions on this exam.

1. Getting a feel for the data is an important first step when doing data analysis.
   1. Provide appropriate descriptive statistics and graphical displays for each of the four variables in the data set for the whole sample of 223 infants.
   2. BPD is the primary variable of interest for this study. Provide appropriate descriptive statistics for birth weight, gestational age and toxemia status for those infants with and without BPD separately.
   3. Create plots to visually compare birth weight, gestational age and toxemia status between those infants with and without BPD.

bpd	bweight	gestage	toxemia
1	850	27	0
0	1500	33	0
1	1360	32	0
0	960.000061	35	1
0	1560	33	0
0	1120	29	0
1	810.000061	28	0
0	1620.000122	32	0
1	1000	30	0
1	700	26	0
0	1330	31	0
0	1410	31	0
1	1520	31	0
1	910.000061	29	0
0	1650	33	0
0	1460	32	0
1	1000	28	0
1	710	25	0
1	1220	28	0
1	820	28	0
0	1060	29	0
0	1240	30	0
0	1440	33	0
0	1470	32	0
0	790	29	0
1	910.000061	29	0
0	1020	29	0
0	1340	28	0
0	1140	34	0
0	1450	34	0
1	1670.000122	30	0
0	1690	33	0
0	950	31	0
1	810.000061	29	0
1	730	27	1
1	730	26	0
1	650	30	0
0	900	26	0
0	1690	32	0
0	1200	28	0
1	700	26	0
1	750	29	0
1	1000	31	0
0	1500	31	0
1	1310	31	0
1	1310	31	0
1	989.999939	29	0
1	910.000061	28	0
0	1500	33	0
1	1030	27	0
1	1000	28	0
0	1300	30	0
0	1560	32	0
0	1040	29	0
1	760	27	0
0	740	28	1
1	930	28	0
1	860.000061	28	0
1	880	30	0
1	860.000061	29	0
0	930	30	0
0	850	30	0
0	889.999939	27	0
1	1560	30	0
1	1560	32	0
0	880	31	1
0	1629.999878	32	0
0	1550	32	0
0	1130	30	0
0	1180	30	0
0	935.999939	27	1
0	1360	30	0
0	1000	27	0
0	1170	29	0
0	1160	30	0
0	1570	33	0
0	1540	33	0
0	889.999939	28	0
0	1030	30	0
1	1200	30	0
1	650	26	0
0	1729.999878	34	0
0	1370	33	0
0	1670.000122	36	0
0	1530	34	0
1	1600	33	1
1	650	28	0
0	1530	33	0
0	1600	36	0
0	1510	33	0
0	1260	31	0
0	1320	31	0
0	1330	32	0
0	1720.000122	32	0
0	1500	30	0
1	570	27	0
0	870	29	0
0	1320	30	0
1	1420	30	0
1	860.000061	27	0
0	1500	31	0
0	1610	34	0
1	1600	33	0
0	1310	29	0
1	1580	30	0
1	1060	29	0
1	889.999939	26	0
1	870	30	0
0	820	29	1
0	1700	32	0
1	800	26	0
1	1020	28	0
0	1180	31	1
1	700	25	1
0	790	29	0
1	850	27	0
0	1400	32	0
0	1280	32	0
0	1190	32	1
1	880	28	0
1	930	30	0
0	1040	33	0
0	1030	32	0
0	1350	33	1
1	1030	26	0
1	550	25	1
0	1070	33	0
0	1490	30	0
0	1000	29	0
0	1530	31	0
1	760	26	0
0	1470	33	0
1	989.999939	29	0
1	860.000061	30	0
1	870	29	0
1	1050	29	1
1	1040	28	0
0	1400	29	1
0	730	31	0
0	1240	34	0
0	1000	29	0
0	1660	31	0
1	1060	30	0
0	1050	28	0
0	1520	31	1
1	820	26	0
0	1380	32	1
0	1250	32	0
0	1020	32	1
0	1200	30	0
0	1260	30	0
0	1120	30	0
1	1350	31	0
0	1330	30	0
0	1340	30	1
0	1590	30	1
0	1370	33	0
0	1650	33	0
0	1550	33	1
1	770	26	0
1	870	28	0
0	1120	31	1
1	820	26	0
1	450	28	1
0	520	28	1
1	850	30	0
0	1230	32	1
0	1520	33	0
0	1370	32	0
0	1430	30	0
0	980	29	0
0	1090	28	0
0	1720.000122	32	0
0	1350	28	0
1	910.000061	29	0
1	860.000061	28	0
0	1720.000122	30	0
1	750	27	0
0	740	27	0
1	900	29	0
0	820	28	0
0	960.000061	29	0
0	1020	33	0
0	1150	32	0
0	1040	29	1
0	1280	32	0
0	1090	29	0
0	1110	28	0
0	1430	29	0
0	1600	34	0
0	1629.999878	32	0
0	1670.000122	31	1
1	839.999939	30	0
0	1420	32	0
0	1560	37	0
0	1500	29	0
0	1020	28	0
0	1650	32	0
0	1180	32	0
0	1100	28	0
0	1410	30	0
0	1720.000122	34	0
0	1070	30	0
0	1200	29	0
0	1679.999878	30	0
1	845	26	0
0	1340	29	0
0	800	34	0
0	970	31	1
0	950	31	0
0	1560	36	0
1	839.999939	31	0
0	1400	30	0
1	665	27	0
0	1600	31	0
0	1679.999878	32	0
0	1640	31	1
0	1120	28	1
1	700	27	0
0	1380	33	0
0	989.999939	30	0
0	1220	29	0
0	1480	32	0