In 2012 the Centers for Disease Con Vitamin population of Americans 8% suffer fr

Question

In 2012 the Centers for Disease Con Vitamin population of Americans 8% suffer from Vitamin D deficiency trol and Prevention reported that in a sample of4349 African Americans 31% were D deficient. A 90% confidence interval based on this sample is (030, 032). It is believed that among the general 10) 10) Define the appropriate parameter and state the appropriate hypotheses for testing the claim that, among African Americans Vitamin D deficiency occurs at a rate other than 8%. A) Ho: p> 0.08 Ha:p 0.08 B)Ho: p z 0.08 Ha:P-0.08 C) Ho: p 0.0s Hai p 0.08 D) Hop-0.08 Ha:p> 0.08 11) Does this confidence interval provide evidence that among African Americans Vitamin D deficiency occurs at a rate other than 8%? what significance level is being used to make this decision? A) Yes, at the 10% significance level C) Yes. at the 90% significance level B) No, at the 10% significance level D) No, at the 90% significance level A study suggests that exposure to UV rays through the car window may increase the risk of skin cancer.The study reviewed the records of all 1050 skin cancer patients referred to the St. Louis University Cancer Center in 2004. Of the 42 patients with melanoma, the cancer occurred on the left side of the body in 31 patients and on the right side in the other 11. 12) Is this an experiment or an observational study? 12) A) Experiment B) Observational study 13) Of the patients with melanoma, what proportion had the cancer on the left side? Round your answer to three decimal places. A) p-o030 B) p-0.738 ce-o 738 D) P-0.262 14) Suppose the question of interest is whether melanomas are more likely to occur on the left side than 14) on the right. State the null and alternative hypotheses. ?) ??: ?-0.5 Ha: P

Explanation / Answer

(10) H0:p=0.08 v/s Ha:p?0.08; Hence, option(c) is correct.

(11) (A) Yes, at the 10% significance level.

(12) Experiment

(13) p^=(31/42)=0.738

(14) H0:p=0.5 v/s Ha:p<0.5

(15) (B) left tailed

(16) (A) Reject H0.

(17) (A) Reject H0, there is evidence that melanomas are more likely on the left side.

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