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a study is performed

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Question

a study is performed to assess whether there is an association between exposure to second hand smoke in infancy

and delayed development. Fifty children with delayed development and fifty with normal development are selected for investigation. Parents are asked whether their children were exposed to second hand cigarette smoke in infancy or not. This study is an example of a:

A. prospective cohort study

B.retrospective cohort study

C. case control study

D. clinical trial

 
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mean PEF

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Question

An investigator conducts a study to investigate whether there is a difference in mean PEF in children with chronic

bronchitis as compared to those without. Data on PEF are collected and summarized below. Based on the data, is there statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without? Apply the appropriate test at alpha=0.05

1. Critical t value=

2. Computed t= 

3. Based on comparing the critical t value to the computed t value which of the following is (are) true?

A. There is statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without.

B. There is not statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without.

C. There is not enough date points to reach a conclusion.

D. Answers B and C.

 
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Which of the following is true?

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Question

Which of the following is true?A. In logistic regression, the predictors are dichotomous, and the outcome

is a continuous variable.

B. When calculating a correlation coefficient between two variables, the scales on which the variables are measured affect the value of the correlation coefficient.

C. It is more difficult to reject a null hypothesis if we use a 10% level of significance compared with a 5% level of significance.

D. The sample size is required to detect an effect size of 0.25 is larger than the sample size required to detect an effect size of 0.50 with 80% power and a 5% level of significance.

 
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biostatistics

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Question

I need help during a biostatistics quiz.  Can anyone help?  I need to start now.

 
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