What is the definition of variable ? What the definition from population and sample ?.
1. What is the definition of variable ? What the definition from population and sample ?.
Definition of variable
1 a : able or apt to vary : subject to variation or changes variable winds variable costs
b : fickle, inconstant
2 : characterized by variations
3 : having the characteristics of a variable
4 : not true to type : aberrant —used of a biological group or character
Populations
In statistics the term "population" has a slightly different meaning from the one given to it in ordinary speech. It need not refer only to people or to animate creatures - the population of Britain, for instance or the dog population of London. Statisticians also speak of a population of objects, or events, or procedures, or observations, including such things as the quantity of lead in urine, visits to the doctor, or surgical operations. A population is thus an aggregate of creatures, things, cases and so on.
Samples
A population commonly contains too many individuals to study conveniently, so an investigation is often restricted to one or more samples drawn from it. A well chosen sample will contain most of the information about a particular population parameter but the relation between the sample and the population must be such as to allow true inferences to be made about a population from that sample.
Consequently, the first important attribute of a sample is that every individual in the population from which it is drawn must have a known non-zero chance of being included in it; a natural suggestion is that these chances should be equal. We would like the choices to be made independently; in other words, the choice of one subject will not affect the chance of other subjects being chosen. To ensure this we make the choice by means of a process in which chance alone operates, such as spinning a coin or, more usually, the use of a table of random numbers. A limited table is given in the Table F (Appendix), and more extensive ones have been published.(1-4) A sample so chosen is called a random sample.The word "random" does not describe the sample as such but the way in which it is selected.
In programming, a variable is a value that can change, depending on conditions or on information passed to the program.
In biology, a population is all the organisms of the same group or species, which live in a particular geographical area, and have the capability of interbreeding
A sample, in the context of scientific research and statistics, is a representative subset of a population
2. What is the smallest sample size required to provide a 90% confidence interval for a mean, if it important that the interval be no longer than 2 cm? You may assume that the population is normal with variance 16 cm².1. Population mean or
Jawaban:
Printtech inc. is introducing a new line of inkjet printers and would like to promote the number of pages a user can expect from a print cartridge. a sample of 10 cartridges revealed the following number of pages printed the smallest sample size required to provide a 90% confidence interval for a mean, if it important that the interval be no longer than 2 cm Dottie Kleman is the ""Cookie Lady."" She bakes and sells cookies at 50 different locations in the Philadelphia area. Ms. Kleman is concerned about absenteeism among her workers Population mean or
3. 1. The following results come from two independent random samples taken of two populations. Sample 1 Sample 2 n1 5 50 n2 5 35 x1 5 13.6 x2 5 11.6 s1 5 2.2 s2 5 3.0 a. What is the point estimate of the difference between the two population means? b. Provide a 90% confidence interval for the difference between the two population means. c. Provide a 95% confidence interval for the difference between the two population means.
Jawaban:
pikir dewek aja pinter e nurun
4. Printtech inc. is introducing a new line of inkjet printers and would like to promote the number of pages a user can expect from a print cartridge. a sample of 10 cartridges revealed the following number of pages printed. 2,698 2,028 2,474 2,395 2,372 2,475 1,927 3,006 2,334 2,379 a.what is the point estimate of the population mean? b.develop a 95% confidence interval for the population mean.
Jawaban:
mean= 2,408.8
Penjelasan:
thanks for this
5. What will happen to the following food chain if the population of the producer increase : Spinach Plant - Grasshopper - Sparrow. a. The population of the grasshopper will decrease. b. There is less population of sparrow. c. The population of sparrow will increase. d. Nothing happen to the food chain.
Jawaban:
c. The population of sparrow will increase.
6. Data were collected on the fiber diameter and the fleece weight of wool taken from a sample of 20 sheep. the data are shown in the following graphs. graph 1 is a scatterplot of fleece weight versus fiber diameter with the respective least-squares regression line shown. graph 2 is the associated plot of the residuals versus the predicted values.
Penjelasan dengan langkah-langkah:
Pengambilan data diameter serat dan berat bulu domba diambil dari sampel sebanyak 20 ekor domba. data tersebut disajikan dalam grafik berikut. grafik 1 adalah sebaran berat bulu domba versus diameter serat dengan masing-masing garis regresi kuadrat terkecil ditampilkan. grafik 2 adalah plot terkait dari residu versus nilai yang diprediksi
7. Biologists have debated whether the decrease in the elk from 18,000 in 1995 to 7,000 in 2009 is due to the reintroduction of wolves. What other factors might account for the decrease in the elk population? 3. Consider the long-term changes in the elk and wolf populations. Are these cyclic changes reasonable? Why is there a lag between the time when the elk begins to decline and the wolf population begins to decline? Are the minimum values for the wolf population realistic? Plot the elk population versus the wolf population and interpret the results. What does the initial-value problem
Jawaban:
Penjelasan:when the wolves numbers increase , they will need more food to consume ,so they gon be huntin' the elk ,which resulted in the declining of the elkiez' population
8. 2. Construct a 95% confidence interval for a normally distributed population mean for each of the following samples: Sample a: 1,1,1,2,7,8,8,8 Sample b : 1,2,3,4,5,6,7,8 Explain why these two samples produce different confidence intervals even though they have the same mean and range?
Jawaban:
Buat interval kepercayaan 95% untuk rata-rata populasi yang terdistribusi normal untuk setiap sampel berikut:
Sampel a: 1,1,1,2,7,8,8,8
Sampel b: 1,2,3,4,5,6,7,8
Jelaskan mengapa kedua sampel ini menghasilkan interval kepercayaan yang berbeda meskipun memiliki mean dan range yang sama?
Penjelasan dengan langkah-langkah:
itu artinya kak seterusnya saya gak bisa
9. Which of the following conditions tends to increase the size of a population??
Yes or no, yes..........
10. What will happen to the following food chain if the population of the producer increase : Spinach Plant - Grasshopper - Sparrow. a. The population of the grasshopper will decrease. b. There is less population of sparrow. c. The population of sparrow will increase. d. Nothing happen to the food chain.
C. The population of sparrow will increase
Jawaban:
a. The population of the grasshopper will decrease.
Penjelasan:
semoga membantu
11. what are the types of population mobility
tipe dari populasi
#SemogaMembantu
12. 1. The books in the library, most which are about English literature, are put on the shelves.... a. most of whomb. some of whomc. most of whichd. in whiche. for which2. Jakarta,.....is about 10 million people, is the capital city of Indonesiaa. the population whichb. whom the populationc. whether the populationd. the population of ite. the population of which
Jawaban:
1.Buku-buku di perpustakaan, yang kebanyakan tentang sastra inggris, diletakkan di rak-rak …
A. kebanyakan dari siapa
B. beberapa dari siapa
C. sebagian besar yang
D. di mana E. untuk yang√
2.Jakarta, … Adalah sekitar 10 juta orang, adalah
A. populasi yang
B. siapa populasi √
c apakah populasi
D. populasi itu
E. populasi yang
13. Bacteria are living things that are single cell. Rashan was investigating two samples of bacteria. One sample came from a pond. The other came from composted leaves that were falling apart. Later, he noticed that the pond sample formed bubbles when it was left in a sunny window. A) What were the bubbles that appeared in the pond sample? What process was taking place?
a)Oxygen gas
b)Photosynthesis
Explanation :
Noted that some bacteria uses light energy from the sun to make 'food' from process call photosynthesis . Photosynthesis uses CO2, water and light source to produce or synthesis oxygen and glucose as food .
Thus the bubbles appeared is oxygen gas.
and the process involved is photosynthesis.
14. A sudden event drastically changes the habitat of each population such that most of the normal vegetation and insects are replaced by other vegetation and insects. One of the scientists claims that population 2 will be the most severely affected. Predict the most likely effect of the event on population 2. Provide reasoning to justify your prediction.
Jawaban:
apa
Penjelasan:
ia mungkin saja lah begitu
15. A national team of researchers is studying depression among women. Several samples are taken across the country, and the mean score on a depression inventory is computed for each sample. The data are summarized in the following table. What is the mean depression score for all women?
Jawaban:
computed for each sample.
16. The mean annual cost of automobile insurance is $939 (CNBC, Febbruary 23, 2006). Assume that the standard deviation is o = $245 a) what is the probability that a simple random sample of automobile insurance policies will have a sample mean within $25 of the population mean for each of the following sample sizes : 30, 50, 100 and 400? b) What is the advantage of a larger sample size when attempting to estimate the population mean?
apa artinya itu? maaf ya jika tidak memberi jawaban.
17. In a public opinion poll, 624 people from a sample of 1,100 indicated they would vote for a specific candidate. How many votes can the candidate expect to receive from a population of 40,000?
To solve this problem the best way is
624/1100 = x/40000
x = 624*40000/1100
x = 24960000/1100
x = 22690 votes
18. 2. You are given a food sample in food class of the tood sample ? powder form. How do you determine the food sample
Jawaban:
You are given a food sample in powder form. How do you determine the food sample? to determine by adding the water to the powder. then a powder form would be easier to determine the food class.
Penjelasan:
Untuk menggunakan makanan dalam bentuk bubuk, kita dapat menambahkan air kedalamnya lalu memasaknya, sehingga bahan makanan bubuk tersebut dapat menjadi makanan, contoh makanan bubuk tersebut yaitu agar-agar atau minuman powder.
Pelajari lebih lanjut materi tentang makanan dan munuman larutan dan campuran https://brainly.co.id/tugas/13800108
#BelajarBersamaBrainly
19. In a hypothetical population, 16% have sickle-cell anemia. The population is in Hardy-Weinberg equilibrium. ( sickle-cell anemia is recessive) a. What is the frequency of the allele for sickle-cell anemia? b. What is the frequency of the allele for normal hemoglobin? c. What percentage of the population produces only normal hemoglobin? d. What percentage of the population is heterozygous?
Jawaban:
Dalam populasi hipotetis, 16% menderita anemia sel sabit. Populasi berada dalam ekuilibrium Hardy-Weinberg. (anemia sel sabit bersifat resesif) a. Berapa frekuensi alel untuk sel sabit an
20. 4. The population of a city is 67.721 and the neighboring city has a population of 52,103. The difference between two cities is______a. 13,000 b. 14,00 C. 16,000 5. In 2016, the population of a region was 91,274. In 2017, the population was increased by 6,015. In 2017, the population was about__________ a. 85,000 b. 97,300 c. 99,800 6. There are 26,358 children living in this town. Half of the children are boys. There are about____________boys living in this town. a. 12,800 b. 13,000 C. 13,300
Penyelesaian:
67.721-52.103
=15.618
Dibulatkan
=16.000(C.)
----------------------------------------
91.274+6.015
=97.289
Dibulatkan
=97.300(B.)
----------------------------------------
26.358×1/2
=26.358/2
=13.179
Dibulatkan
=13.000(B.)
----------------------------------------
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Jawaban:
4. C. 16,000
5. B. 97,300
6. B. 13,000
Penjelasan dengan langkah-langkah:
[tex]\color {cyan}{\huge \boxed {\fcolorbox {black}{pink}{SEMOGA \: MEMBANTU}}}[/tex]
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