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
قد تكون المبيدات الحشرية الحل الأمثل والسريع للتخلص من وجود النمل في البيت، وذلك من خلال اختيار النوعيات الجيدة وذات التأثير القوي من المبيدات الحشرية، ورشها مباشرةً عل النمل حال رؤيته في المنزل مع ضرورة البحث عن الحفر والمخابئ التي يخرج منا ورشّها أيضاً بالمبيدات الحشرية من أجل القضاء على ما تبقى منها، ويراعى عند استخدام المبيدات الحشرية إبعاد الأطفال عن أماكن رشّها، وتنظيف المنطقة بالماء والصابون بعد التأكّد من موت النمل.
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