A survey of 2321 adults in a certain large country aged 18 and older conducted by a reputable polling organization found that 403have donated blood in the past two years.  (a) Obtain a point estimate for the population proportion of adults in the country aged 18 and older who have donated blood in the past two years. ​

Q: A university dean is interested in determining the proportion of students who recieve some sor of…

A:

Q: A school district started using a new criteria for selecting which students entered their…

A: Given, The study found that under the new criteria about 75% of the students in the district were…

Q: In a recent election, 63% of all registered voters participated in voting. In a survey of 275…

A: The percent of participation of voters is equal to: In the given case; when the observation sample…

Q: In a survey of 399 randomly selected households conducted in the U.S., it was found that 158 of the…

A: Given, The objective is to find the best point estimate of the proportion of households that have…

Q: Based on the Nielsen ratings,the local CBS affiliate claims its 11 PM newcast reaches 41% of the…

A: Given Information: Based on the Nielsen ratings,the local CBS affiliate claims its 11 PM new cast…

Q: A survey of 2310 adults in a certain large country aged 18 and older conducted by a reputable…

A: Given information- We have given that in a survey of 2310 adults in a certain large country aged 18…

Q: In an October 2003 poll conducted by the Gallup organization, 684 of 1006 randomly selected adults…

A: Point estimate:The point estimate of population proportion is sample proportion.

Q: A survey of 2390 musicians showed that 398 of them are left-handed. Find a point estimate for p, the…

A: We have find population left handed..

Q: .In sampling a large number of electronic chips manufactured by a machine, the mean number of…

A: First we have to find the probability of atleast 3

Q: According to the Government Accountability Office, 80% of all college students ages 18 to 23 nad…

A:

Q: Suppose that in a large class, the instructor announces that the average grade on an exam is 75.…

A: According to the definition of estimation, a sample mean is equal to the population mean.

Q: In a sample of 137 leopards selected randomly from one preserve, it is found that 7 of them have…

A: H0 : p = 0.13 H1: p ≠ 0.13

Q: A random sample of 260 workers in a high rise office building revealed that 30% were very satisfied…

A: Let the proportion of workers who are satisfied with the quality of work be p^ p^ = 0.30 (point…

Q: Fifty people are selected randomly from a certain population and it is found that 12 people in the…

A: From the given information, There are 50 people and 12 people in the sample are over six feet tall.…

Q: Do teachers find their work rewarding and satisfying? An article reports the results of a survey of…

A:

Q: The IRS is interested in estimating the total number of tax accounts who has their own tax returns…

A: A random sample of 100 returns showed that 15 were audited; n=100 x=15 α=0.95

Q: In order to estimate attendance at a music festival, management counts the number of people entering…

A: it is follow A,P with first term a = 2250, d = 2250 , n = 20

Q: A marketing manager for a cell phone company claims that more than 35% of children aged 10-11 have…

A: Assume that p is the true proportion of all children aged 10-11 that have cell phones.

Q: the american association of individual investors conducts a weekly survey of its members to measure…

A: The population proportion p is 0.39. The null and alternative hypotheses are given below. Z-test is…

Q: Among the first-year resident students, eight students were randomly selected, and their body…

A: Given: weight at the beginning of the semester (X) End of term weight (Y) 45 52 61 65 62 64…

Q: If a manufacturer conducted a survey among randomly selected target market households and wanted to…

A: From the provided information, Margin of error (E) = 6% that is 0.06 Confidence level = 95% The…

Q: In a recent election, 54% of all registered voters participated in voting. In a survey of 350…

A: Writing the sample population as a percentage i.e. 217 of 350:

Q: 5 Just prior to jury selection for O. J. Simpson's murder trial in 1995, a poll found that about 20%…

A: Given that  Let X denotes the number of jurors believing in Simpson's innocence  20% of the adult…

Q: In a study of the relationship between birth order and college success, an investigator found that…

A: Given that  Sample sizes n1=180 , n2=100 Favorable cases x1=126 , x2=54

Q: ple of 1000 Americans, it was discovered that 920 of them lived in neighborhoods with acceptable…

A: The point estimate (sample proportion) of the sample of size n can be defined as: p^=xn  Here, x =…

Q: An education official is interested in the percentage of the adult population over 20 years, in his…

A: Given, An education official is interested in the percentage of the adult population over 20 years,…

Q: In 2015, the average duration of long-distance telephone calls from a certain town was 3.9 minutes.…

A: given that N=50 sample mean= summation of x/N

Q: The Los Angeles City Controller's office calculated that in 2013, the city employed 4703047030…

A: Given: 2013 Number of full time employees = 47030 Number of part time employees = 10142 p denotes…

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: Given: Margin of Error ME= 0.06 Confidence level c= 0.90

Q: 4. Out of 450 randomly selected people in a soccer match, 225 of them were students. Compute the…

A: 450 people are selected randomly; n=450 225 of them were students; x=225

Q: In order to study the mean blood pressure of people in his town, Richard samples the population by…

A: We know that stratified sampling involves dividing the population into groups and randomly selecting…

Q: the american association of individual investors conducts a weekly survey of its members to measure…

A:

Q: A sample of n = 64 scores is selected from a population with µ = 80 and with σ = 24. On average, how…

A: Givenn=64μ=80σ=24

Q: In a random sample for 56 professional actors, it was found that 46 were extrovert.let p represent…

A: Given that in a random sample for 56 professional actors, it was found that 46 were extrovert. i.e.…

Q: A study is to be made to estimate the proportion of residents of a certain city and its suburbs who…

A: Given: Confidence level = 0.95, margin of error = E = 0.08.

Q: A survey of 120 fatal accidents showed that in 24 cases the driver at fault was inadequately…

A: Point estimate:   The population parameter which is estimated by using sample statistic is termed as…

Q: In a sample of 88 children selected from a city, 8 children suffer from asthma. What is the P-value…

A: Statistical hypothesis testing is an important method in inferential statistics. Statistical tests…

Q: A poll found that 83% of people out of a survey of size 127 watch at least three hours of TV per…

A: Given: A poll found that 83% of people out of a survey of size 127 watch at least three hours of TV…

Q: Question 20

A: From the provided information, The hypotheses can be constructed as: Null hypothesis: H0: p = 0.38…

Q: A survey of 2322 adults in a certain large country aged 18 and older conducted by a reputable…

A: Solution: Let X be the number of adults in the country aged 18 and older who have donated blood in…

Q: the american association of individual investors conducts a weekly survey of its members to measure…

A: We are given the following results about the stock market The proportions for bullish, bearish, and…

Q: In a random sample of 500 teenagers 12 to 17 years old, it was found that 330 have regular access to…

A: A random sample of 500 teenagers 12 to 17 years old; n=500 It was found that 330 have regular access…

Q: Using the data, estimate the proportion of new car buyers who prefer foreign cars.

A: It is given that Sample size n = 383 Numver of car buyers prefer foreign over domestic, X = 137

Q: The manager of a city recreation center wants to estimate the percent of city residents who favor a…

A: The confidence interval for the population proportion (single sample) is obtained by using the…

Q: A researcher wants to determine the percentage of American teenagers who send or receive text…

A:

Q: The local sheriff has staked his campaign for re-election on the claim that that at least 88% of the…

A: Givensample size(n)=66p^=80%=0.80p=88%=0.88

Q: The IRS is interested in estimating the total number of tax accounts who has their own tax returns…

A:

Q: A poll found that 71% of people out of a survey of size 130 watch at least three hours of TV per…

A: From the given information,   A poll found that 71% of people out of a survey of size 130 watch at…

Q: Fifty people are selected randomly from a certain population and it is found that 12 people in the…

A: Sample size = n = 50 Sample number of events = x = 12 Sample proportion = p̂ = x/n = (12/50) =…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.