“周末统计问题”系列:每次一个小问题，配备中英文解释
《英国医学会杂志》（BMJ）自2008年9月开始至2015年由两位流行病与统计学专家不间断地出了300多期statistical question系列。在这个系列中，两位学者每次出一道统计学选择题，进行选择并解释。作为高校统计学教师，我如获珍宝！
a) Scatter plot b) Box plot c) Histogram d) Hypothesis test
Scatter plots usually display the relation between two continuous variables plotted on the x and y axes. A one way scatter plot may be used to display a single continuous variable, but a disadvantage is that the plot may be difficult to read if too many points lie close together.
Box plots display only a summary of the data, and some of the information about the shape of the distribution is obscured. For example, a box plot may extend from the 25th centile to the 75th centile and contain a line representing the median. Lines projecting out from the box may be added (“whiskers”) to display more extreme parts of the distribution of values.
A histogram is perhaps the most commonly used graphical method of displaying either continuous data, such as height, or discreet data, such as mortality. The horizontal axis displays the limits that are used for each interval. For each interval a rectangular column centred on the midpoint is drawn rising from the horizontal axis. The vertical axis measures the number of values that fall within each interval or, if desired, the percentage of values that fall within each interval.
Hypothesis testing is not a method for displaying data.
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