Suppose a consumer advocacy group would like to conduct a survey to find the proportion p of consumers who bought the newest generation of an MP3 player were happy with their purchase. a) How large a sample n should they take to estimate p with 2% margin of error and 90% confidence? b) The advocacy group took a random sample of 1000 consumers who recently purchased this MP3 player and found that 400 were happy with their purchase. Find a 95% confidence interval for p. 4 decimal places lower limit = upper limit =

Q: 1) A sample of 532 Peanut Butter M&M's contains 74 yellow candies; write a 95% confidence statement…

A: In this case, the confidence level is 95%. The 95% confidence interval for the proportion/percentage…

Q: In a study of the accuracy of fast food​ drive-through orders, Restaurant A had 348 accurate orders…

A: Given information: There are 348 accurate orders and 69 that were not accurate. Total number of…

Q: A poll reported 30% support for a statewide election with a margin of error of 3.96 percentage…

A: Given  p^=30%, margin of error=e=3.96% , Level of the significance=0.05

Q: A local newspaper in a large city wants to assess support for the construction of a highway bypass…

A: given that,possible chances (x)=543size(n)=1152success rate ( p )= x/n = 0.4714point of estimate =…

Q: poll reported 41% support for a statewide election with a margin of error of 1.72 percentage points.…

A: We have given that  Population proportion p =41%=0.41 Margin of error =E =1.72%=0.0172 90%…

Q: A clinical trial tests a method designed to increase the probability of conceiving a girl. In the…

A: We have to find ci.

Q: find the sample size needed to estimate the percentage of democrats who have tattoos. Use a 0.05…

A:

Q: 3) A corporation employs 148 sales representatives. A random sample of 60 of them was taken, and it…

A: The sample proportion is computed as follows,

Q: Assume that 66 % of single women and 81.9 % of single men own cars. Also assume that these estimates…

A: Given data, p1=66%=0.66 n1=1640 p2=81.9%=0.819 n2=1800 z-value at 99% confidence is Zc=2.576

Q: A genetic experiment with peas resulted in one sample of offspring that consisted of 449 green peas…

A: Construct a 95​% confidence interval to estimate of the percentage of yellow peas. Find…

Q: A genetic experiment with peas resulted in one sample of offspring that consisted of 426 green peas…

A:

Q: Construct a 99% confidence interval estimate for the population mean, N = 36, ?̅= 135, σ = 24

A: As the population standard deviation σ is not known, we will use z-distribution.  The value of z at…

Q: Suppose you use simple random sampling to select and measure 47 dogs' weights, and find they have a…

A: Given, mean is 78 and standard deviation is 13.5. Sample number is 47. We with use one sample z…

Q: 8. In a survey of a simple random sample of students at a certain college, the sample mean time per…

A: Here we need to find whether the given statement is true or false. We need estimate the sample mean…

Q: The Malayo Colleges Mindanao recently conducted a study analyzing the privacy management habits of…

A:

Q: In hypothesis testing if the null hypothesis is rejected, _____.   a. no conclusions can be drawn…

A: Given statement is : In hypothesis testing if the null hypothesis is rejected, _____.

Q: 1) A consumer magazine polls cell-phone-users to see if they are happy with their phones and would…

A:

Q: Assume that a sample is used to estimate a population proportion p. Find the 95% confidence interval…

A:

Q: A company reported that 72​% of 1691 randomly selected college freshmen returned to college the next…

A:

Q: Suppose we observed 15 successes in a random sample of 60 subjects. What is the 99% confidence…

A:

Q: A New York Times article reported that a survey conducted in 2014 included 36,000​adults, with…

A: Given,According to the 2014 survey, proportion of success is p = 3.71% = 0.0371Confidence level, C =…

Q: A poll reported 37% support for a statewide election with a margin of error of 4.18 percentage…

A:

Q: After reading an article using research done by the Organization for Economic Co-operation and…

A: The 95% confidence interval for p is (0.25, 0.32).

Q: An online grocery company is researching the best location to start their new delivery service. They…

A: Number of residents in region A, nA=505 Number of residents in region B, nB=388 Proportion of…

Q: A manufacturer interested in estimating the fraction of defectivE units produced. A random sample of…

A: The answer is given using the formula of the confidence interval.

Q: A simple random sample is to be taken of 572 business majors in a college to estimate the proportion…

A: Given: Margin of error (E) = 0.04 Confidence level = 1.96 No information about the population…

Q: A restaurant owner, who owns fast food restaurants throughout Arkansas, Texas, and Oklahoma is…

A: Givensample size(n)=200x=118sample proportion(p^)=xn=118200=0.59confidence level=99%

Q: Out of 67,410 surgeries tracked in a study in the U.K., 2832 were followed by surgical site…

A: Given informationWe have given that out of 67,410 surgeries tracked in a study in the U.K., 2832…

Q: n a study on how people get to work, 360 employees are selected randomly in a city; it is found that…

A: Solution: Given information: n= 360 Sample size  p^= 0.092  Sample proportion  α=0.05 Level of…

Q: In a random sample of 200 people, 74% of them said that they do go to Truecar.com before they go…

A: It is given that 74% out of 200 people said that they do go to Truecar.com before they go shopping…

Q: If 64% of a sample of 550 people leaving a shopping mall claims to have spent over $25 create and…

A: Given,   Sample size = 550 Sample proportion = 0.64   Critical value: Using z-table, the z-critical…

Q: In a random survey of 510 college students, 342 indicated that they have student loan debt.  A…

A: It is given that a random survey of 510 college students, 342 indicated that they have student loan…

Q: In six attempts it took a looksmith 9, 14, 7, 8, 11, and 5 seconds to open a certain kind of lock.…

A: Given data: 9, 14, 7, 8, 11, 5 Confidence level = 95%

Q: Of 266 employees selected randomly from one company, 13.53% of them commute by carpooling. Find the…

A:

Q: A city is divided into 50 geographic subdivisions. An estimate was required of the proportion of…

A: The three random sample size is given as: 611, 521, 734. The no. of households who express in…

Q: assume that a sample is used to estimate population proportion p. find the 95% confidence interval…

A:

Q: A poll found 51% of a random sample of 1093 preschoolers said they saw Santa Claus. Determine the…

A: Suppose p is the true population proportion of pre-schoolers, who said they saw Santa Claus.

Q: In the past, 70% of a garage's business was with former patrons. Clarence Wade, the owner of the…

A: Solution: Given information: n= 600 Sample size  x = 432 Successes  p^=xn=432600= 0.72 Sample…

Q: A simple random sample of 1100 males aged 12 to 17 in the United States were asked whether they…

A: Given,sample size(n)=1100and (x)=775sample proportion…

Q: To decide what personnel requirements should be enforced, a hospital manager wants to estimate the…

A:

Q: In a sample of 95 recommendations, it is found that 56% of them made money. Determine the upper…

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

Q: A graduate student is interested in how viewing different types of scenes affects working memory.…

A: Given,⇒ 95% confidence interval for the mean difference is:     d± tn-1 , α/2sd     1.4±2.030×0.2667…

Q: What proportion of commercial airline pilots are more than 40 years of age? Suppose an analyst has…

A: Let p be the population proportion of commercial airline pilots who are more than 40 years of…