1.The distribution of height in a large class of studentsis roughly bell-shaped or normal.The average height is68 inches,and approximately95% of the heights are between 62 and 74 inches(lecture 3A).Based on this information, onestandard deviationshould be equal to:

A)9 inches

B)6 inches

C) 3 inches

D)2 inches

2.For a study evaluating exposure to pesticides and possible association with cancer of thyroid gland, 1,888 people with thyroid cancer and 3,501 people without thyroid cancer were selected. Among those who had thyroid cancer, 345 reported recent or past exposure to pesticides whereas those without thyroid cancer 118 reported exposure to pesticides either recently or in the past. Taking into account the design of this study, please calculate thesuitablemeasure of association/effect(type in your final answer withtwo decimalsplease).

3.At the end of a Randomized Controlled Trial, the outcome was measured as a continuous variable and normality checks revealed it to be highly skewed. To investigate whether there is significant difference between the treatment and control group that is not due to chance alone, what should be the suitable approach?

A)This outcome variable is of no good use; either choose another variable or conduct the whole trial once again.

B)Carry out data transformation (into natural log or other options) and then use One Sample t test.

C)Carry out data transformation (into natural log or other options) and then conduct Independent Samples t Test.

D)No need to worry about data transformation just carry out theIndependent Samples t Test and hope for the best.

E)Carry out data transformation (into natural log or other options) and then use Pearson'sChi Squared test.

4.Please identifyTWO CORRECTstatements:two answersare required.

A)Findings are not practically significant if there is no statistical significance.

B)Findings have statistical significance if 95%CI of Odds ratio doesnot include 1.

C)Findings have statistical significance if 95%CI of mean difference doesnot include 0.

D)Findings have statistical significance if 95%CI of Odds ratio doesnot include 0.

E)Findings have statistical significance if 95%CI of mean difference doesnot include 1.

F)Findings have statistical significance if p value is .05 or higher.