An automotive manufacturer wants to know the proportion of new car buyers who prefer foreign cars over domestic. In an earlier study, the population proportion was estimated to be 0.31. How large a sample would be required in order to estimate the fraction of new car buyers who prefer foreign cars at the 95% confidence level with an error of at most 0.03?

Q: A federal report indicated that 22% of children ages 2 to 5 years had a good diet, an increase over…

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Q: Find the value of ta for a 99% confidence interval when sample size is 30

A: Hi! Thank you for the question, As per the honor code, we are allowed to answer one question at a…

Q: A poll conducted in 2013 found that 52% of U.S. adult Twitter users get at least some news on…

A: Solution: From the given information,

Q: A recent study among 120 street hawkers in Johannesburg showed that 42 of them are of the opinion…

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Q: A company wants to estimate, at a 95% confidence level, the proportion of all families who own its…

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Q: Kim wants to determine a 80 percent confidence interval for the true proportion of high school…

A: Given: Margin of error, E=0.04 Confidence level=80%

Q: A May 2000 Gallup poll found that 38% of a random sample of 1012 adults in the United States said…

A: (a)   Obtain the 96% confidence interval to estimate the true proportion of all U. S. adults who…

Q: In a study of government financial aid for college​ students, it becomes necessary to estimate the…

A: formula for the sample size :

Q: A consumer agency wants to estimate the proportion of all drivers who wear seat belts while driving.…

A:

Q: A pew Poll conducted in 2013 surveyed a random sample of 2003 adult Americans, and 18% of them said…

A: The random variable X follows normal distribution. We have to construct 90% confidence interval.…

Q: In a random sample of 500 people eating lunch at a cafeteria on various Fridays, it was found that…

A: Given that Sample size n= 500  Favorable cases x=160 Sample proportion p^=x/n

Q: music fans yields this 95% confidence interval estimate of the proportion of fans who love the music…

A: The sample proportion can be calculated as: Sample Proportion=LowerLimit+UpperLimit2 Thus, Sample…

Q: Suppose that you will be taking a random sample from a population and that you intend to find a 95%…

A: Solution: The confidence interval for the population mean is calculated by using the following…

Q: . If she wants to make a 95% confidence interval for the mean with the margin of error of 5 cm, at…

A: here from given information , σ = 17 cm MOE = 5cm here Z-critical for 95 % confidence level = 1.96…

Q: By means of a pilot survey, it is already known that the proportion of residents in opposition to…

A: Formula for sample size is,

Q: For a group of 45 students taking a PSDTF test, the mean heart rate was 96 beats per minute, and the…

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Q: A poll conducted randomly in 2014 found that 52% of U.S. adult Twitter users get at least some news…

A: Proportion is 0.52. The standard error 0.024 The absolute value of Zα/2 is 2.5758 using the Excel…

Q: kendall wants to estimate the percentage of vegetarians who are also vegan. She surveys 150…

A: The margin of error for the 95% confidence interval of population proportion is given as follows :…

Q: Seventy-three percent of a sample of 1000 students drive a used car as opposed to a new car or no…

A: Given: Proportion  = 73 % Confidence level  = 80 %

Q: Suppose that a 95% confidence interval for a population p = the population proportion of men who…

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Q: The figure to the right shows the results of a survey in which 999 adults from Country​ A, 1006…

A: Hey, since there are multiple subparts posted, we will answer the first three subparts. If you want…

Q: A quality controller wants to estimate the proportion of high quaity goods out of a batch of…

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Q: Cora wants to determine a 80 percent confidence interval for the true proportion of high school…

A: GivenMargin of error(E)=0.04cofidence level(c)=80%assume population proportion (p)…

Q: What value of z should be used to calculate a confidence interval with a 95% confidence level?

A: The z value which is used to calculate 95% confidence interval is defined as P(-zvalue < Z <…

Q: Beth wants to determine a 95 percent confidence interval for the true proportion p of high school…

A: Here we need to find the required sample size inorder to construct a 95% confidence interval for the…

Q: An investigator computes a 95% confidence interval for a population mean on the basis of a sample of…

A: To find half of width, We need to calculate 4 times the sample Size.

Q: An automotive manufacturer wants to know the proportion of new car buyers who prefer foreign cars…

A:

Q: Suppose you survey a random sample from a large population. How large must your sample be if you…

A: According to the provided data, the margin of error is 0.06 and the confidence level is 0.98. Since,…

Q: From a recent survey, the 90% confidence interval estimate of the proportion of students who have…

A: Note: As per the guidelines only one question can be answered. Kindly,  resubmit the question with…

Q: Suppose we know that a confidence interval for a population proportion is (0.572, 0.662), with a…

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Q: We plan to sample parents in order to construct a 99% confidence interval for the proportion who…

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Q: A company wants to estimate, at a 95% confidence level, the proportion of all families who own its…

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Q: In the previous example, you learned that the 95% confidence interval for the true proportion of all…

A: Calculate the point estimate and margin of error used to create this confidence interval.

Q: For many years businesses have struggled with the rising cost of health care. But recently, the…

A: Obtain the margin of error. The value of the margin of error is obtained below as follows: Use…

Q: A poll commissioned by the Center on Addiction and Substance Abuse at Columbia University found that…

A: Given that, X = 1340 N = 2000 98% confidence level

Q: A large trucking company wants to estimate the proportion of its tracker truck population with…

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Q: A confidence interval for a population proportion p is 0.635 to 0.700. What is the margin of error?

A: We have given that confidence interval for a population proportion p is 0.635 to 0.700.

Q: Michael wants to make a confidence interval estimate for the proportion of community members in…

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Q: find tc for a 95% confidence level when the sample size is 6.

A: level of significance, alpha = 0.05from standard normal table, two tailed t alpha/2 with n-1 = 6 d.f…

Q: The Pizza Shop wanted to determine what of its customers ordered an only cheese pizza. Out of 90…

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Q: Suppose a 90 percent confidence interval to estimate a population proportion was calculated from a…

A: The confidence interval for proportion can be calculated as follows:

Q: For the same sample statistics, which level of confidence would produce the widest confidence…

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Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: The formula for the sample size is as follows:

Q: A consumer agency wants to estimate the proportion of all drivers who wear seat belts while driving.…

A: It is given that the margin of error (E) is 0.49.

Q: The owner of the Gas station wishes to determine the proportion of customers who use credit card. he…

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Q: Suppose you compute a confidence interval with a sample size of 37. What will happen to the…

A: If the sample size increases from 37 to 70 then, the margin of error of the confidence interval…

Q: Beth wants to determine a 99% confidence interval for the true proportion of high school students in…

A: Suppose p is the true proportion of high school students in that area who attend their home…

Q: A study of 150 randomly selected accidents that involved trips to the emergency room found that 36%…

A: Given 99% confidence level, significance level α=1-0.99=0.01

Q: What would be the standard error in computing a confidence interval for the difference of…

A: It is given that For population 1, sample size n1 = 49, sample proportion = 0.682 For population 2,…

Q: A survey was conducted to determine the proportion of adults who approve of attempts to clone a…

A: Given,   Lower bound = 0.09 Upper bound = 0.13   The objective is to find the point estimate of the…