NOTE: Assume we are testing at α = 0.05 for all statistical tests

1. In a study of the role of dietary fats in the etiology of ischemic heart disease, the patients were 60 males between 40 and 60 years of age who had recently had a myocardial infarction. The outcome variable of interest was the proportion of linoleic acid in the subjects’ plasma triglyceride fatty acids.
   [DATA: eab_703_exam2_linoleic_acid]
   Construct the 90%, 95%, and 99% confidence intervals for this data set ( 3 )
2. For multiple sclerosis patients we wish to estimate the mean age at which the disease was first diagnosed. We want a 90% confidence interval that is 8 years wide. If the population variance is estimated to be 85 from previous research, how large a sample should be taken? (6)
3. Planning Parenthood ®, a national organization that assists teenage mothers with pregnancy, estimates that approximately 37% of the women coming into the center had contracted a sexually transmitted infection. They wish to plan a study to obtain a more statistically relevant estimate.
   How many samples are required if we wish a 95% confidence interval that is within 0.03 of the true population proportion? (3)
4. Can we conclude that the intraocular pressure (mmHg) values recorded for a sample of 21 elderly subjects is equal to 16? (10)
   [DATA: eab_703_exam2_eye_pressure]
   Ho:
   Ha:
   Test statistic & value:
   p-value:
   Statistical conclusion:
   Practical conclusion:
5. Can we conclude that, on the average, lymphocytes and tumor cells differ in size? The data represent the cell diameters (μm) of 40 lymphocytes and 50 tumor cells obtained from biopsies of tissue from patients with melanoma. (10)
   [DATA: eab_703_exam2_lymphocytes_tumor]
   Ho:
   Ha:
   Test statistic & value:
   p-value:
   Statistical conclusion:
   Practical conclusion:
6. Vitacca et al. conducted a study to determine whether the supine position or sitting position worsens static, forced expiratory flow volumes. The data represent FEV percent values for 15 patients measured twice – when sitting and when in the supine position.
   [DATA: eab_703_exam2_FEV]
   Does FEV differ between sitting and supine positions? (10)
   Ho:
   Ha:
   Test statistic & value:
   p-value:
   Statistical conclusion:
   Practical conclusion:

7. ---

   An article in Adolescent Health stated that of the 1250 boys in a study of eating habits, 217 indicated evidence of binge eating behavior when under stress.
   Is there evidence to suggest that less than 20% of boys engage in binge eating behavior? (10)
   Ho:
   Ha:
   Test statistic & value:
   p-value:
   Statistical conclusion:
   Practical conclusion
8. The number of UNLV students meeting the criteria for problem or pathological gambling was studied by an MPH student. Of the 107 students in the study, 34 met the criteria. The numbers were distributed as shown in the table below.

   Gender	N	Number meeting gambling criteria
   Male	54	24
   Female	53	10

   
   Is there evidence to suggest that there is a difference in the proportion of male and female problem/pathological gamblers in this study? (10)
   Ho:
   Ha:
   Test statistic & value:
   p-value:
   Statistical conclusion:
   Practical conclusion:
9. A study by Licciardone et al. on osteopathic manipulation as a treatment for chronic back pain was conducted to compare osteopathic manipulative Therapy (OMT), sham manipulation (SHAM), or non-intervention (CONTROL). Patients rated back pain from 0 = no pain to 10 = worst possible pain.
   [DATA: eab_703_exam2_osteopath]
   Can we conclude, based on these data that, on average, pain levels differ in the three treatment groups? (10)
   Ho:
   Ha:
   Test statistic & value:
   p-value:
   Statistical conclusion:
   Practical conclusion:
   IF post hoc tests are appropriate, provide a summary of the results below. \
10. Hartman-Maier et al. were interested in evaluating awareness deficits among stroke patients undergoing rehabilitation treatment. Of the 54 patients in the study, 35 had right hemisphere lesions and 19 had left hemisphere lesions. Lesions were grouped according to size (2 = 1-3cm diameter; 3 = 3-5cm diameter; 4 = 5+ cm diameter). Higher scores on the unawareness scale indicate more stroke damage. Using the unawareness score as the dependent variable, provide an ANOVA to examine the potential significant effects of the two independent factors in the study (i.e., Factor 1 = Lesion group size; Factor 2 = Hemisphere where damage occurred). (15)
    [DATA: eab_703_exam2_brain_damage]
11. If the average systolic blood pressure of normal adult males is approximately normally distributed with a mean of 121 mmHg and a standard deviation of 11.3 mmHg, find the probability that a sample of size 16 will yield a mean:

Greater than 125 mmHg (5)

Between 117 mmHg and 127 mmHg (5)

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