The IRS is interested in estimating the total number of tax accounts who has their own tax returns audited last year. If a random sample of 80 returns showed that 12 were audited, develop a 95% interval estimate for true proportion (population proportion) of tax accounts who had their returns audited last year.

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: (a) The proportions are 22.2% for males and 18.7% for females, The margin of error is 3%, and…

Q: For a repeated-measures ANOVA, if SSwithin treatments = 86, SSbetween treatments = 80, SSbetween…

A: F-Ratio = MSbetween treatmentsError

Q: In order to estimate the population proportion with a high school education,  you need a minimum…

A: It is given that margin of error (E) is 0.07 and the confidence level is 0.95.Here,

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A:

Q: An optometrist wishes to know the proportion of patients who undergo laser eye surgery who end up…

A:

Q: What percent of patients received pamidronate? What percent of patients experienced the occurrence…

A: Let us define some events A : patient receive pamidronate. B : patient experiences the occurrence of…

Q: A sample selected by taking the members of the population that are easiest to reach is called a…

A: Convenience samplingA sample that is made up by people that are easy and very convenient to reach is…

Q: In a sample of 4972 car owners, 2326 said that they would seriously consider purchasing an…

A: Given  n=4972, X=2326 Point estimate=p^

Q: How large must the sample size be in order to estimate a true proportion to within one precentsge…

A: Solution: From the given information, confidence level is 0.90 and E=0.01.

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: d. Glamour Magazine obtains sample data from readers who decide to mail in questionnaire printed in…

A: Introduction: It is required to identify the type of sampling used.

Q: During routine screening, a doctor notices that 20% of her adult patients show higher than normal…

A: Obtain the sample size of a preliminary estimate for p is 0.20 with the 95% confidence. The formula…

Q: What sample size should you gather to achieve a 0.7 hour margin of error?

A: here given , population standard deviation  = 4.2 hour  confidence level = 99% MOE  = 0.7

Q: Suppose a certain Statistics instructor wants to estimate the proportion of students who enjoy…

A: Given datamargin of error=0.03

Q: ucled a survey among randomly selected target market households and wanted to be 99% confident that…

A: Let us assume sample proportion (p^)=0.51-p^=1-0.5=0.5α=1-0.99=0.01α2=0.025Z0.025 =2.58 (from…

Q: To quantify the average discrepancy between sample means and population means, researchers compute

A: This part comes under estimator estimation

Q: A polling agency wants to determine the percentage of voters in favour of extending tax cuts. they…

A: Given information- Margin of error, E = 2% = 0.02 Confidence level, c = 95% Since nothing is known…

Q: A quality-conscious disk manufacturer wishes to know the fraction of disks his company makes which…

A:

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: In 2010, a survey was given to 822 teenagers, aged 13 to 17, randomly selected by the allup Poll.…

A: Solution: Given information: n= 822 Sample size p^=0.84 Sample proportionq^= 1-p^=0.16 Assume level…

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: Addmissions officer sampled 124 entering freshmen and found that 35 of them scored less than 530 on…

A: According to the provided information, x=35 n=124

Q: A company claims that 90% of its deliveries arrive on time. You take a sample of 74 deliveries, of…

A: Given,   The sample proportion is,

Q: intended population

A: A population is the entire group that you want to draw conclusions about   Intended population:…

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: a) Compute the required sample size using the formula: E=zα2 p⏞11-p⏞1n+p⏞21-p⏞2n   Where 'E' is the…

Q: You have been hired by a consortium of local car dealers to conduct a survey about the purchases of…

A: Given: Confidence level = 95% Margin of error = 0.03 Formula Used: n = ZαMargin of error2 p(1-p)

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: A political campaign manager wishes to survey a number of voters to estimate the proportion of those…

A:

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: A Chinese cell-phone manufacturer exclusively uses robots in one of its factories. A random test run…

A:

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: To estimate the male proportion P1 = 0.223 and female proportion P2 = 0.198 Margin of Error E = 0.02…

Q: If random samples, each with n = 16 scores, are selected from a normal population with µ = 100 and σ…

A: Here, the known values are n = 16 scores, µ = 100 and σ = 20.

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: 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: A physician recorded the number of seizures that each of 20 patients with severe epilepsy had during…

A: Introduction: It is required to identify the observational units and the population being studied.

Q: State the one-way ANOVA identity, and interpret its meaning with regard to partitioning the total…

A: One-way ANOVA identity is given below: SST=SSTR+SSE

Q: A state highway patrol official wishes to estimate the number of  legally intoxicated    drivers on…

A: It is given that margin of error (E) is 0.05 and the confidence level is 0.99.

Q: Assuming statistical testing was performed, what three items should be on every chart (in small…

A: A hypothesis test is carried out on the null hypothesis to determine if we have sufficient evidence…

Q: Seventy-four percent of Americans favor spending government money to develop alternative sources of…

A: According to the provided information, Sample size (n) = 120 Probability (p) = 0.74

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: Among 1815 randomly selected high school students surveyed by the Centers for Diseases Control, 300…

A: The sampling distribution of sample proportion is generated using the sample proportions of repeated…

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: 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: 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 news reporter stands on a street corner and obtains a sample of city residents by selecting five…

A: Correct answer : Convenience sampling

Q: An auditor revlewed 25 oral surgery Insurance clalms from a particular surgical office, determining…

A:

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) =…