what is the difference between histograms and bar charts? (4)

(1) there are no spaces between the bars on histograms (2) class intervals are not equal (3) y axis is labeled frequency density, not just frequency (4) it is the area of the bar that matters, not the height

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how do you answer a histogram question? (2)

(A) count the squares (B) calculate the area using frequency density = class width x density

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what are the types of data? (6)

primary (collected by you) secondary (taken from others) qualitative( words) quantitative (numbers) - discrete (can only be certain numbers) continuous ( could be any number)

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what must you always remember? (5)

title, labels, key, penil, ruler

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name the ways to display data? (9)

bar charts (bar charts, dual bar charts, composite bar charts) histograms, frequency polygons, vertical line graph, pictograms, stem and leaf, pie charts

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what are the types of sampling? (4)

random, stratified - cluster, quota and systematic

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what is random sampling

where there is no pattern or thought put into who is selected.everyone has an equel chance of being selected

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what is stratified sampling

the population is properly represented this is done by the sample size population size x stratum size

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describe cluster, quota and systematic sampling

cluster = where the population naturally splits into groups eg towns // quota sampling = when the population is selected due to certain characteristics eg age // systematic = when a random starting point then people are chosen at regular intervals

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describe symetrical, negatively skewed and positively skewed box plots

symmetrical = median is in the middle of the box plot // negatively skewed = median is closer to the upper quartile // positively skewed = median is closer to the lower quartile

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what must you avoid when designing a question? (4)

(1)over lapping groups (2) being biased / leading (3) may be too personal (4) being too vague - include figures!

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how do you find the mean of a frequency table?

the total of fx over the total of the frequency

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Other cards in this set

Card 2

Front

how do you answer a histogram question? (2)

Back

(A) count the squares (B) calculate the area using frequency density = class width x density

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