Karteikarten
DA- week 2 - chapter 3
Karten in diesem Stapel (44)
- 1methods of organising, exploring and summarising data...-
- 2what is meant by visual data?provides charts and graphs
provides insight into characteristics of data without using mathematics - 3define numerical dataincludes statistics or tables (using maths)
- 4steam leaf displays and dot plots ...look in book for example
- 5what are the three main things that dot plots revealdispersion, central tendency, shape of distribution
- 6define distributionthe extent to which a distribution is stretched or squeezed
- 7define central tendencythe values of random variable to cluster around its mean, mode or median
- 8define shape of distributioncentre of location of distribution
- 9define a frequency distributionA representation that displays a number of observations within a given interval
- 10How do you calculate relative frequencyfrequency / total
x100 - 11Define a modal classA histogram bar that is higher than those on either side
- 12define unimodalA single modal class
- 13Define bimodal classTwo modal class
- 14define multimodalmore than two modal classes
- 15A histogram may suggest the shape of the population depending on the skewness. Define Skewnessindicated by the direction of the longer tail of the histogram
- 16Define left - skeweda longer left tail
- 17what is a left skewed also known asnegative skew
- 18What is a right skeweda longer right tail
- 19what is a right skewed also known asa longer right tail
- 20what does symmetric meanboth tails area are the same
- 21Define frequency polygonA line graph that connects midpoints of the histogram intervals
- 22what is important about the line at the beginning and end of the graphit needs to touch the x axis
- 23why is it more attractive than a histogrammore than one frequency polygon can be plotted on the same scale.
- 24What is am ogiveline graph of the cumulative frequencies
- 25what is it useful for- finding percentiles
- comparing shape of the sample using a benchmark such as the normal distribution - 26using excel to create charts-
- 27Define line charts- used to display a time series or spot trends, or to compare time periods
- 28how many variables can you display at onceseveral
- 29Define two-scale line chartused to compare variables that differ magnitude or are measured in different units.
- 30What's the difference between a column and a bar chart- column chart is a vertical
- bar chart is horizontal - 31define Pareto chartcontains both bars and a line graph, where individual values are represented in descending order by bars, and the cumulative total is represented by the line.
- 32define stacked column chartbar height with the sum of several subtotals. Areas may be compared by colour to show patterns in the subgroups and total.
- 33Define pie chartsa type of graph in which a circle is divided into sectors that each represent a proportion of the whole.
- 34define scatter plota graph in which the values of two variables are plotted along two axes, the pattern of the resulting points revealing any correlation present.
- 35How do you arrange information in a tableiv - left column
x axis
dv - right column
y axis - 36define independent variable- the variable that changes by itself
- 37define dependent variable- The variable we are measuring
- 38Deceptive graphs...-
- 39error 1 - what is the problem with a Nonzero originit exaggerates the trend
- 40error 2 - what should the aspect ratio be below...below 2.00
- 41error 3 dramatic titles name a feature that a title should have- short but adequate
- 42- error 4 3/D and novelty graphs why should pyramid charts be avoided?they distort the bar volume and make it hard to measure bar height
- 43error 5 rotated graphs - what is the problem with rotated graphs?trends appear to dwindle (diminish gradually in size,amount or strength) or loom towards you
- 44name other 5 errors- complex graphs (misleading)
- area trick
- unclear scales
- vague sources
- gratuitous effects (done without good reason)
- estimated data
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- Karteikarten am DA- week 2 - chapter 3, erstellt von Venisha Moothia am 09/11/2020.
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- Venisha Moothia
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