A market researcher selects a simple random sample of n .....
1. A market researcher selects a simple random sample of n .....
A market researcher selects a simple random sample of n = 100 users of a social media website from a population of over 100 million registered users.
2. There are 25 adults and 15 children in a bus. What is the proportion of the number of adults?
Jawaban:
[tex]\frac{5}{8}[/tex] portion.
Penjelasan:
There are 25 adults and 15 children on the bus. What is the proportion of the number of adults?
To get the proportion of the adults we just need to compare the number of adults (which is 25) to the number of all people there (it's 25 + 15 = 40).
So we can find the proportion of the number of adults as follows:
The Proportion of adults = [tex]\frac{25}{40}[/tex] [we should simplify this fraction]
= [tex]\frac{5}{8}[/tex] portion.
3. 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.
4. a letter is selected at random from each of the word 'NICE' and 'ICE' represent the sample space using a possibility diagram and find the probability two letters are the same and the vowels!
Jawaban:
Correct options are A) , B) and C)
(A) Total number of letters in the given word = 4, out of these O and E are two vowels.
Let S be the sample space, then
S={HO,HM,HE,OM,OE,ME}⇒n(S)=6
Let A1 be the event of taking two vowels, then
A1={OE}=n(S)n(A1)=61
(B) Let A2 be the event of taking at least one vowel, then we have
A2={HO,HE,OE,ME,MO}⇒n(A2)=5
Hence, required probability =n(S)(n(A2))=65
(C) Let A3 be the event of taking one letter as M, then we have A3={HM,OM,ME}⇒n(A2)=5
Hence,required probability =n(S)n(A3)=63=21
Penjelasan dengan langkah-langkah:
maaf kalau ada slah
5. There were 875 adults and 368 children at the carnival. Find the difference between the number of adults and the number of children.
Answer:
875-368
=507
----------------------------------------
So,the difference between the number of adults and the number of children is 507
----------------------------------------
[tex] \boxed{ \colorbox{black}{ \sf{ \color{lightgreen}{ answered\:by\:Duone}}}} [/tex]
Jawab:
875 - 368 = 489
the answer is 489
6. At a carnival, the number of adults to the number of girls to the number of boys is 4:7:9. There are 26 more boys than girls. How many adults are there at the carnival?
Penjelasan dengan langkah-langkah:
adults : girls: boys
4 : 7 : 9
26 + girls = boys
boys-girls= 26
girls = 7/2 × 26 = 91
adults = 4/7 × 91 = 52
7. write the sample of announcement
Jawaban:
Examples of announcements:
* It was announced to all student council administrators that they could gather in the school yard for a while after school, because there were things that needed to be discussed.
*It was announced that all school students who will join the marching band activities can gather
indonesia ny
Contoh pengumuman :
Diumumkan kepada seluruh pengurus osis supaya bisa berkumpul di halaman sekolah sebentar sepulang sekolah ,karena ada hal yeng perlu dibicarakan.
Diumumkan bagi seluruh siswa sekolah yang akan mengikuti kegiatan marching band supaya bisa berkumpul sekarang juga.
8. Q1. A small voting district has 101 female voters and 95 male voters. A random sample of 10 voters is drawn. What probability exactly 7 of the voters will be female?
saya tidak tahu artinya karena soalnya bahasa inggris
9. Police B City reports a lot of traffic citations were issued last month. A random sample of 25 of these citations showed the mean amount of the fine was $100.000 with a sample standard deviation of $4000. What is a 98% confidence interval for the mean amount of a citation of B City.
diketahui
n = 25
x bar = 100000
s = 4000
1-a = 98% => z = 2.33
maka interval Kepercayaan
x bar ± Z . s/√n
100000 ± 2.33 . 4000/√25
100000 ± 2.33 . 4000/5
100000 ± 2.33 . 800
100000 ± 1864
10. 2 There were 312 people in a theatre, 120 were children and the rest wereadults of the adults were menHow many adults were there in the theatre?How many men were there in the theatre?120312There wereadults in the theatre.
Jawaban:
How many adults were there in the theatre?
jawaban : 192
maaf cuma segitu doang yang aku tau
11. 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
12. give the sample of exposition text
Jawaban:
Cars are the most popular means of transportation. However, there are many causes of car accidents on the road.
Sometimes accidents are caused by bad weather. Ice or snow can make toads very dangerous.
Accidents can also result from problems with the car. Even a small problem like a flat tire can be serious. Bad roads are another cause of accidents.
Some accidents are caused by drinking too much alcohol. Knowing some of the factors that cause accidents is very important to prevent accidents when driving
Penjelasan:
semoga membantu y hyung ✨
13. 13. the amount of curvature in the type of wafer used in the manufacture of integrated circuits has a mean of 1.3 mm and a standard deviation of 0.1 mm. a random sample of 200 wafers is drawn. how many wafers must be sampled so that the probability is 0.05 that the sample mean exceeds 1.305?
Jawaban:
what you need and the bear brand new with best offer just love
14. 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
15. Were most of the victims children or adults
Apakah mayoritas korban anak-anak atau dewasa?
^^
16. Sixty percent of children in a school do not have cavities. Let x be the number of children in a random sample of 20 children selected from this school who do not have cavities. The standard deviation of the probability distribution of x is approximately: ?
Jawaban:
Let X Be The Number Of Children In A Random Sample Of 50 Children Selected From This School Who Do Not Have Cavities. The Mean ... ·
17. During the 2003 season, Major League Baseball took steps to speed up the play of baseball games in order to maintain fan interest (CNN Headline News, September 30, 2003). The following results come from a sample of 60 games played during the summer of 2002 and a sample of 50 games played during the summer of 2003. The sample mean shows the mean duration of the games included in each sample.
Jawaban:
Bantu terjemahin ya .. ...
Selama musim 2003, Major League Baseball mengambil langkah-langkah untuk mempercepat permainan baseball agar dapat mempertahankan minat penggemar (CNN Headline News, 30 September 2003). Hasil berikut berasal dari sampel 60 pertandingan yang dimainkan selama musim panas 2002 dan sampel 50 pertandingan yang dimainkan selama musim panas 2003. Sampel rata-rata menunjukkan durasi rata-rata permainan yang termasuk dalam setiap sampel.
18. leisure time survei of young adults in the uk..in our online poll we asked 1000 young adults aged between 16 and 24 how do you spend your free time?here are the results:1. ....percent of young adults use the internet every day2. the most popular leisure activity is going to the cinema.....percent say it is their favourite evening activity.82 percent of people say they watch tv for more than.3....... hours a week,but only 4.......... percent listen to the radio.38 percent of young people watch live music,but only 5........percent can play a musicaly instrument.only 6......percent of young adults play sport.football,swimming and cycling are the most popular sports.
Jawaban:
Travel me to the heaven
Penjelasan:
yes queen
19. Writing two examples of independent and dependent variables. Random samples help scientists collect accurate data. A random sample means that each object in the sample has an equal chance of being chosen from the overall set of objects being studied. For example, a farmer wantd to know how many insects are in his apple orchards. He would not have a good sample if he only selected trees near the road. A better option is to randomly select the trees from all over the orchard.
Jawaban:
Penulisan dua contoh variabel independen dan dependen. Sampel acak membantu ilmuwan mengumpulkan data yang akurat. Sampel acak berarti bahwa setiap objek dalam sampel memiliki peluang yang sama untuk dipilih dari keseluruhan kumpulan objek yang sedang dipelajari. Misalnya, seorang petani ingin mengetahui berapa banyak serangga yang ada di kebun apelnya. Dia tidak akan mendapatkan sampel yang baik jika dia hanya memilih pohon di dekat jalan. Pilihan yang lebih baik adalah memilih pohon secara acak dari seluruh kebun.
Penjelasan:
semoga membantu:)
20. There are 9 adults and 27 children at a party. What is the ratio of the number of children to the number of adults ? Give your answer in its simplest form.
[tex] \boxed {Jawab : } [/tex]
Ratio = Perbandingan
Ratio :
= 9 : 27
= [tex] \frac{9}{27} [/tex]
= [tex] \frac{3}{9} [/tex]
= [tex] \frac{1}{3} [/tex]
= 1 : 3
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