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A weekly trend is the trend of a certain security when looking in a chart with weekly time frame.
line chart
A bar graph is a type of chart in which data (usually absolute quantities) is shown as bars either vertically or horizontally. Each bar can further be split up into sections.Another chart type is the pie chart in which data (most often parts of a whole, percentages, etc.) is shown as wedges of a circular "pie".Another chart type is a scatter plot where data is plotted as discrete points perhaps connected with a trend line.
Sparkline
Generally, pie charts do not indicate trends. Line, bar and column charts are better for trends. They are designed to show how something is split up, so it does not have that purpose, so the answer would normally be no. However, a pie chart could indicate a trend if there was a pattern in the successive slices, like if each was getting larger and each represented a time period, like a month. A few pie charts shown together could also indicate a trend, by looking at how the same data changes from chart to chart.
reflects the long-term trend in a particular price level
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A line chart would be the best chart to do that. However, it could also be done with a bar or column chart. You can also add trendlines to them to help show a trend.
If you read through the names of the charts, only one of them has the word "line" in it. It is kind of obvious that the answer is a line chart!
Government spending
A line chart is often used to visualize a trend in data over intervals of time, thus the line is often drawn chronologically.
It indicates how the data is changing and can be used as a prediction for values in the future. If the values are increasing a trend line will show that and give an idea of what future values might be.