In a survey conducted by CNN, 130 of the 250 people that were randomly surveyed have a savings account. (a) Construct a 90% confidence interval to estimate the true population proportion of people that have a savings account. (b) Suppose CNN is going to conduct this survey a second time. If we want our estimate to be within 3% of the true population proportion with 90% confidence, how many people do we need to sample?

Q: 2. Suppose that you take a random sample of 360 people who voted in the last election in a heavily…

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Q: uring an election, Kevin and Britney took a poll of 1,200 voters, and asked what the most…

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Q: Students at a certain college were asked if they have a car. After surveying 823 students, it was…

A: We know that a margin of error tells us how many percentage points our results will differ from the…

Q: In a telephone survey of 1100 adults, 740 adults expressed concern about the future health of social…

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Q: When constructing a confidence interval, if we construct a confidence interval with a 95% confidence…

A: The general formula for the width of the confidence interval is,

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

A: Given data, n=152 x=101 p=x/n =0.664 The 95% CI is Zc=1.96

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

A: We have given that,  Population proportion (p) = 0.53, margin of error (E) = 0.03 and confidence…

Q: You observe 60 customers at a coffee shop, and 82% of them tip. What is the 95% confidence interval…

A: Given : You observe 60 customers at a coffee shop, and 82% of them tip.

Q: 1. In a recent poll 62 out of 149 randomly chosen students at Allen High School say they plan to buy…

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Q: A company wants to know what proportion of their customers plan to repurchase their product in the…

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Q: In a recent poll, 310 people were asked if they liked dogs, and 40% said they did. Find the Margin…

A: Given data: n = 310p⏞ = 40100=0.40C.I = 99%      =0.99Then, calculate αα = 1-0.99   =0.01Now,…

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

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

A: Solution:There is no estimates available, hence the sample proportion is assumed to be 0.50.The…

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

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Q: A recent study indicated that 24% of women over 55 are widows. A researcher wishes to estimate with…

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Q: Part a and b

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Q: in a recent poll, 220 people were asked if they liked dogs, and 36% said they did . find the margin…

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Q: You would like to estimate the proportion of all residents in favor of a new law with 98%…

A: The sample proportion is 0.30, margin of error is 0.06, and the confidence level is 98%. Computation…

Q: A study sponsored by the American Savings Education Councilt included data from a survey of 1752…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: t poll, 240 people were asked if they liked dogs, and 35% said they did. Find the Margin of Error…

A: Given: n = 240 p^=35%=0.35 The value of z at 95% confidence level is 1.96, which can be obtained by…

Q: A researcher wants to estimate the actual proportion of citizens of a certain country who feel that…

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Q: What proportion of Law School applicants are accepted into Law School? In a survey of a random…

A: According to the given information in this question  We can say that the We are 95% confident the…

Q: 1. Online News In a Harris poll of 2036 adults, 40% said that they prefer to get their news online.…

A: Given that the sample size is n=2036 and sample proportion, p^=0.40. Confidence level=95%…

Q: A researcher wanted to compare the percentages of men and women who play the lottery.  They randomly…

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Q: A 95% confidence interval for the proportion of all statistics students from a large high school…

A: The objective of the question is to understand the relationship between the confidence level and the…

Q: wenty years ago, a very famous psychologist specializing in marriage counseling authored a book…

A: Solution: Given information n= 275 Sample size of couples who bought book. X= 217  stayed together…

Q: Students at a certain college were asked if they have a car. After surveying 601 students, it was…

A:

Q: You want to survey students to see what proportion of them have taken Statistics 101. This survey…

A: Margin of error(M) = 4% = 0.04 Confidence interval = 95%

Q: You want to determine if the proportion of people who will vote for the president next year has…

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Q: A recent survey of 349 people ages 18 to 29 found that 86% of them own a smartphone. Find the 99%…

A: The 99% confidence interval of the population proportion is obtained below as follows:   The formula…

Q: In a recent poll, 450 people were asked if they liked dogs, and 54% said they did. Find the Margin…

A: Solution

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

A: Given:Margin of error (E) = 0.09Confidence level = 90%Since, the proportion of people that support…

Q: You are interested in constructing a 99% confidence interval for the proportion of all caterpillars…

A: Given n=417 X=45

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.