QUESTION 2

link : https://www.nature.com/articles/s41598-020-68862-x

1. In Lianget al, in theMethodssection, underStudy design and data sources, there is the statement that certain countries were excluded. Does their exclusion introduce the possibility of bias?

		No, because the authors adjusted their calculations to account for the exclusions
		Yes,because this is an example of volunteer bias
		No, because they were excluded for a legitimate reason
		Yes, because excluding data is always unjustified
		Yes, because countries that are excluded could have underlying similar characteristics

QUESTION 1

1. The first set of questions refer to Liang et al, "Covid-19 Mortality...", the paper that you read for the last problem set.

In Liang et al, in theMethodssection, under the headingVariables, there is information about the distribution of Covid-19 deaths. Based on this information, which of the following statements is most likely to be true?

		The data is normally distributed
		The mean is higher than the median
		The median is higher than the mean
		Any outliers would be on the left of the distribution
		The mode is higher than the mean