# Project #16656 - Biostatistics

**PLEASE SEE ONLINE ANNOUNCEMENT AND SPSS TUTORIAL FOR MORE DETAILED INSTRUCTIONS

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

The local health district conducted a workshop for teenagers to educate them about sexually transmitted infections (STIs).  For 16 year-olds, 21 attended; for 17 year-olds, 50 attended; for 18 year-olds, 44 attended; and for 19 year-olds, 40 attended.  [DATA: EAB_703_ps9]*

* You will need to weight cases by frequencies first for both of these problems then run by group

Is there evidence to suggest that the number of teenagers who attended were equally distributed across the four age groups? – Hint - use nonparametric, chi-sq option

Ho:

Ha:

Test statistic and value:

p-value:

Statistical conclusion:

Written conclusion:

The following table shows 200 males classified according to social class and headache status measured over the past 12 months. [DATA: EAB_703_ps9]*

 Social Class Headache group A B C No headaches 6 30 22 Simple headaches 11 35 17 Unilateral headache 4 19 14 Migraine 5 25 12

Are social class and headache group related based on these data?

Hint – use cross-tabs option

Ho:

Ha:

Test statistic and value:

p-value:

Statistical conclusion:

Written conclusion:

Skinner et al. conducted a clinical trial to determine whether treatment with melphalan, prednisone, and colchicine (MPC) is superior to colchicines (C) alone in treating amyloidosis.  Fifty were treated with C and 50 with MPC.  Eighteen months after the last person was admitted to the trial and six years after the trial began, 44 of those receiving C and 36 of those receiving MPC had died. (check out the epi-max calculator online tool to get the ORs and 95% CIs here – just fill in the cells at: http://www.healthstrategy.com/epiperl/epiperl.htm)

Complete the following table.

 Died Yes No C alone MPC

Compute the relative risk and the 95% confidence interval for relative risk for patients receiving C alone.

 RR 95% CI for RR [               ,               ]

Provide an interpretation of these values.

Voskuyl et al. investigated patients with rheumatoid arthritis (RA).  The investigators were interested in knowing if vasculitis was associated with development of RA in a group of those with RA compared to a group without RA.  The subjects were 207 patients, 169 of which had been diagnosed as having vasculits and 38 patients who did not have the condition.  There were 32 patients who had been diagnosed as having both RA and vasculitis and 21 patients who had neither condition.

Complete the following table.

 RA Yes No Vasculitis positive Vasculitis negative

Compute the odds ratio and the 95% confidence interval for odds ratio for the vasculitis positive patients.

 OR 95% CI for OR [               ,               ]

Provide an interpretation of these values.

 Subject Mathematics Due By (Pacific Time) 11/14/2013 05:00 pm
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