In a random sample of 95 manufacturing firms, 67 indicated that their company attained ISO certification within the last two years. Find a 99% confidence interval for the population proportion of companies that have been certified within the last 2 years.

Q: Out of a random sample of 444 freshman at State University, 169 students have declared a major. Find…

A: Given information: Sample size of freshman at State University n=444 Number of students who have…

Q: In a survey of 1013 ​adults, a polling agency​ asked, "When you​ retire, do you think you will have…

A: From the provided information, Sample size (n) = 1013 Out of which 531 stated that they were worried…

Q: According to a survey, 66% of all students in the U. S. own a laptop. For a simple random sample of…

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Q: According to a survey, 66% of all students in the U. S. own a laptop. For a simple random sample of…

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Q: In a study of color perception, 278 men are tested, and 62 are found to have red/green color…

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Q: A simple random sample of 300 branches out of a total of 1200 branches of a UK travel agency found…

A: Given : Here population is total branches of a UK travel agency  Population Size (N) = 1200 Sample…

Q: In a study of the length of time that students require to earn bachelor's degrees, 100 students are…

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Q: In a random sample of 400 students at a university, 340 stated that they were nonsmokers. Based on…

A: Given; sample size n=400 and x : nonof non smokers =340  then to find 95% confidence interval of…

Q: In a sample of 325 college seniors, 263 responded positively when asked if they have spring fever.…

A: Given data, n=325 x=263 sample proportion p=x/n= 263/325 =0.81 z-value at 95% confidence is Zc=1.96…

Q: Of the 300 students randomly selected from LACC, 30 of them are full-time students. Construct a 99%…

A: Solution: Let X be the number of students at LACC that are full-time students and n be the sample…

Q: 3) In a sample of 172 JCC full-time students, 61 of them prefer to come to campus to take their…

A: Solution: Given information: n= 172 Sample size of JCC full time students x= 61 students prefer to…

Q: Of 127 randomly selected adults, 31 were found to have high blood pressure. Construct a 95%…

A: Given that, Of 127 randomly selected adults, 31 were found to have high blood pressure.  X = 31 N =…

Q: Of 58 bank customers depositing a check, 15 received some cash back.   (a) Construct a 90 percent…

A: (a) Obtain the 90% percent confidence interval for the proportion of all depositors who ask for cash…

Q: In a survey of 2255 randomly selected US adults (age 18 or older), 1787 of them use the Internet…

A: We want to calculate the 90% confidence interval for each of the following proportions

Q: In a study of 150 randomly selected accidents that required treatment in an emergency room, 36%…

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Q: A sample of 200 lightbulbs was tested and it was found that 11 were defective. Calculate a 95%…

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Q: A random sample of 300 graduating high school seniors was polled across a particular tristate area,…

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Q: A sample of 3048 randomly chosen people found that 341 of them were left-handed. Construct a 99%…

A: Sample proportion=p^=xn=3413048Critical value for 99% confidence interval is=z=2.576n=sample…

Q: Of 91 adults selected randomly from one town, 60 have health insurance. Find a 90% confidence…

A: From the provided information, Sample size (n) = 91 Out of which 60 have health insurance. Sample…

Q: Based on the results of a survey conducted by a group of researchers, the proportion of female…

A: Confidence interval is a process of inference which uses the sample statistics to find the range of…

Q: In a sample of 300 people, 48 identified as dog owners. Construct a 99% confidence interval for the…

A: Obtain the 99% confidence interval for the true proportion of people who are dog owners. The 99%…

Q: In a random sample of 500 people aged 20-24, 20% were smokers. In a random sample of 450 people aged…

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Q: A U.S. Travel Data Center survey of 500 adults found that 195 said they would take more vacations…

A: Solution: Let X be the number of adults who said that they will travel more this year and n be…

Q: ...... Construct a 95% confidence interval estimate of the population percentage of candies that are…

A: Given that Number of candies , n = 40 Number of red candies, X = 5 The critical value of Z at 95%…

Q: In a random sample of 145 students, we find that 53% have attended a baseball game at some point in…

A: Given,sample size (n)=145sample proportion(p^)=0.53α=1-0.95=0.05α2 =0.025z0.025 =1.96

Q: In a random sample of 532 individuals, 78% stated they needed a laptop in order to work from home.…

A: Given that  n=532 , p=78%=0.78 99% confidence level

Q: A bank randomly selected 249 checking account customers and found that 111 of them also had savings…

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Q: In a clinical study of an allergy drug, 108 of the 202 subjects reported experiencing significant…

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Q: In a random sample of 575 American goods, about 46.3% of them were transported by rail in 2017.…

A: Given,   Sample size = 575 Sample proportion = 0.463   Critical value: Using z-table, the z-critical…

Q: In a sample 215 out of 497 MSJC students work out. Construct the 95% confidence interval for the…

A: It is given that, In a sample 215 out of 497 MSJC students work out. So,  Sample proportion, p=…

Q: Out of 157 randomly selected adults in the United States who were surveyed, 77 exercise on a regular…

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Q: In a survey 800 randomly selected 16 to 18 years old living in USA were asked whether they have ever…

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Q: In a recent survey of 500 teenagers, 18.6% indicated that they had eaten junk food while watching TV…

A: Given Data: p^=0.186n=500

Q: In a random sample of 600 adults, 270 described themselves as vegetarians. Construct a 99%…

A: In a random sample of 600 adults, 270 described themselves as vegetarians.

Q: In a random sample of 100 drivers, 80 were using seat belts while driving. Construct a 95%…

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Q: In a random sample of 230 men , 18 or older , 142 were married. Construct and explain a 90%…

A: Solution: Let X be the number of married men 18 or older and n be the sample number of men. From the…

Q: A researcher who was interested in knowing how many people in a city supported a new retirement plan…

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Q: In a random sample of 120 large retailers, 85 used regression as a method of forecasting. In an…

A: Solution: Let X1 be the number of large retailers used regression as a method of forecasting, X2 be…

Q: Of 130 adults selected randomly from one town, 30 of them smoke. Construct a 90% confidence interval…

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Q: A magazine publisher wishes to determine what proportion of current subscribes will renew. The…

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Q: A recent study suggested that 70% of all eligible voters will vote in the next presidential…

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Q: Based on a sample of 1000 adult Americans, USA Today reported that 840 of them preferred cheese on…

A: Given that on a sample of 1000 adult Americans, USA Today reported that 840 of them preferred…

Q: Of the 300 students randomly selected from LACC, 300 of them are full-time students. Construct a 99%…

A: The confidence interval is range in which the true value of the unkown exist. where n is the sample…

Q: In a survey of 1020 adults, a polling agency​ asked, "When you​ retire, do you think you will have…

A: The known values are, The sample proportion is, Critical values: By using the standard normal…

Q: A survey of 2450 golfers showed that 281 of them are left-handed. Construct a 98% confidence…

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Q: In a random sample of 500 U.S. adults, 60% said that they believe that the U.S. Congress fails to…

A: Critical value: Using Excel formula “=NORM.S.INV(1-(0.05/2))”, the value of z at 95% confidence…

Q: An internet service provider sampled 540 customers and found that 75 of them had experienced an…

A: Proportion is almost similar to the concept of probability. Proportion is a fraction of population…

Q: In a random sample of 90 homeowners, 71% of them have received robocalls over an outstanding debt.…

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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.