I need help with these question Please help!

1) Hoekema et al. (A-3) studued the craniofacial morphology of patient diagnosed with obstructive sleep apnea syndrome (OSAS) in health male subjects. One of the demographic variables the researchers collected for all subjects was the Body Was INDEX (calculated by dividing weight in kg by the square of the patient's height's in cm). The following are the BMI values of 29 OSAS subjects.

33.57 27.78 40.81

38.34 29.01 47.78

26.86 54.33 28.99

25.21 30.49. 27.38

36.42 41.50 29.39

24.54 41.75 44.68

24.49 33.23 47.09

29.07 28.21 42.10

26.54 27.74 33.48

31.44 30.08

a) Use these data to construct:

A frequency distruction

A relative frequency distribuction

A accumulative frequency distribution

A histogram

A frequency polygram

b)What percentage of the measurements are less than 30?

c)what percentage of measurements are between 40.0 and 49.99 inclusive?

d)what percentage of the measurements are greater than 34.99?

e)describe these data with respect to symmetry and skewness as describe

f)How many of the measurements are less than 40?

2) The purpose of a study by Tem et al (A-15) was to investigate the wheelchair maneuvering in individuals with lower-level spinal cord injury (SCI) and health controls. Subject used a modified wheelchair to incoporate a rigid seat surface to facilitate the specified experimental measurements.Interface pressure measurement was recorded by using a high -resolution pressure-sensitive mat with a spatial resolution of 4 sensors per square centimeter taped on the rigid seat support. During static sitting conditions, average pressures were recorded under the ischial tuberosities . The data for measurements of the left ischial tuberosity (in mm Hg) for the SCI and control groups are shown below

Control 131 115 124 131 122. 117. 88. 114 150 169

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SCI 60 150. 130 180 163 130 121 119 130 148

a) Find the mean, median, variance, and standard deviation for the controls.

b)Find the mean, median variance, and standard deviation for SCI group.

c)Construct a box-and whisker plot for the controls.

d)construct a box-and whisker plot for the SCI.

e)Do you believe there is a difference in pressure readings for controls and SCI subjects in this study?

3)Johnson et al (A-16) performed a retrospective review of 50 fetuses that underwent open fetal myelomeningocele closure. The data below shw the gestational age in weeks of the 50 fetuses undergoing the prodecure.

25 25 26 27 29 29 29 30 30 31

32 32 32 33 33 33 33 34 34 34

35 35 35 35 35 35 35 35 35 36

36 36 36 36 36 36 36 36 36 36

36 36 36 36 36 36 36 36 37 37

a) construct a stem-and leaf plot for these gestational ages.

b)Based on the Stem- and leaf plot, what one worn would you use to describe the nature of the date?

c)why do you think the stem and leaf plot look the way it does?

d)compute the mean, median, variance, and standard deviation.

4)Krieser et al (A-17) examined glomerular filtration rate (GFR) in pediatric renal ransplant recipients GFR is an important parameter if renal function assessed in renal transplant recipents. The following are measurements from 19 subjects of GFR measured with dietylenetriamine penta-acetic acid (note some subjects were measured more than once.)

18 42

21. 43

21 43

23 48

27. 48

27 51

30. 55

32. 58

32 60

32 62

36. 67

37. 68

41. 88

42. 63

a)compute mean, median, variance, standard deviation, and coefficient of variation.

b)construct a stem-and leaf display

c)construct box-and whisker plot.

d)what percentage of the measurements is within one standard deviation of the mean? Two standard deviaiton ? Three standard deviations?