Statistical Measures
Akopọ
Statistical measures let you summarise a data set with a single representative value and describe how spread out the data is. The mean, median and mode each capture a different sense of 'average', while the range and interquartile range tell you how much the values vary. Together they turn raw numbers into concise descriptions that can be compared across groups.
In this topic you will calculate averages and spread for both listed data and grouped frequency tables. At Higher tier you will also read medians and quartiles from cumulative frequency diagrams and use interquartile range to compare distributions.
Awọn Afojusun
- Understand the concept of average
- Calculate the mean, median, mode and range for a discrete data set
- Calculate an estimate for the mean for grouped data
- Identify the modal class for grouped data
- [Higher] Estimate the median from a cumulative frequency diagram
- [Higher] Understand the concept of a measure of spread
- [Higher] Find the interquartile range from a discrete data set
- [Higher] Estimate the interquartile range from a cumulative frequency diagram
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Oriire fun ipari ẹkọ lori Statistical Measures. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- What is the mean of: 4, 8, 6, 10, 2? A) 5 B) 6 C) 7 D) 8 Answer: B
- The data set 3, 5, 5, 7, 9 has which value as its median? A) 3 B) 5 C) 7 D) 9 Answer: B
- For grouped data, which value is used to estimate the mean? A) The lower class boundary B) The upper class boundary C) The class midpoint D) The class width Answer: C
- The interquartile range measures the spread of which portion of the data? A) The lower 25% B) The upper 25% C) The middle 50% D) The full 100% Answer: C
- If a data set has values 2, 2, 3, 4, 4, 4, 5, what is the mode? A) 2 B) 3 C) 4 D) 5 Answer: C
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Awọn Iwe Itọsọna Ti a Gba Nimọran
Ẹ̀kọ́ síwájú láti àwọn orísun ṣíṣí
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Abala ìwé ẹ̀kọ́
Measures of the Center of the Data
The "center" of a data set is also a way of describing location. The two most widely used measures of the "center" of the data are the mean (average) and the median . To calculate the mean weight of 50 people, add the 50 weights together and divide by 50. To find the median weight of the 50 people,
"Introductory Statistics: Measures of the Center of the Data" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/introductory-statistics/pages/2-5-measures-of-the-center-of-the-data. Access for free at https://openstax.org/books/introductory-statistics/pages/1-introduction
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Abala ìwé ẹ̀kọ́
Measures of the Location of the Data
The common measures of location are quartiles and percentiles Quartiles are special percentiles. The first quartile, Q 1 , is the same as the 25 th percentile, and the third quartile, Q 3 , is the same as the 75 th percentile. The median, M , is called both the second quartile and the 50 th percenti
"Introductory Statistics: Measures of the Location of the Data" by OpenStax, OpenStax, Rice University, licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Source: https://openstax.org/books/introductory-statistics/pages/2-3-measures-of-the-location-of-the-data. Access for free at https://openstax.org/books/introductory-statistics/pages/1-introduction
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