QUESTION 6 In a random and independent sample of 1000 students 80% of them were in favor of longer hours at the school library. What is the value of the upper bound ( 95% confidence interval level)? Write your answer as a decimal.

Q: Isabel Myers was a pioneer in the study of personality types. According to one of her surveys, in a…

A: Solution

Q: Why does increasing the confidence level result in a larger margin of error?

A: We know that the Margin of error is directly proportional to the test statistic's critical value,…

Q: Several years ago, 36% of parents who had children in grades K-12 were satisfied with the quality of…

A:

Q: When you construct a 95% confidence interval, what are you 95% confident about?

A: Confidence intervals: Confidence intervals are the limits for the point estimate of population…

Q: A magazine provided results from a poll of 500 adults who were asked to identify their favorite pie.…

A: It is given that: p^ (proportion of adults, who lie chocolate pie at the sample level)=11% (i..e,…

Q: The American Heart Association is about to conduct an anti-smoking campaign and wants to know the…

A: Given that, The sample size, n=1421 There are 454 peoples who smoke. x=454 The sample proportion is…

Q: In a random and independent sample of 4000 students 35% of them were in favor of more online coures.…

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Q: Information about a sample is given. Assume that the sampling distribution is symmetric and…

A: Given,   Sample mean = 60 Standard error = 3   The objective is to construct the 95% confidence…

Q: You're considering going to graduate school, and you would like to know how many people would…

A: From the provided information Sample size (n) = 29, People who recommend x = 9 The sample proportion…

Q: 13 The dala In a study, 137 children of a certain race in a certain city were randomly assigned to…

A: Step 1: Calculate PercentagesWe need to calculate the proportion of children who graduated from high…

Q: Question The heights of American men are normally distributed. If a random sample of American men is…

A: The confidence interval = 66.2,74.6

Q: Out of all the students that attend Yale University, 1,982 were selected to participate in a school…

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Q: A survey of 26 individuals found that they spent an average of $39.21 on exercise attire for the…

A: Confidence interval is an inference process which is used to estimate the population parameter. The…

Q: Illustrate the formula for the confidence interval?

A: confidence interval is defined as a range of values so defined that there is a specified probability…

Q: cording to a report in USAToday, more and more parents are helping ndom sample of 40 young adults…

A: The formula to construct confidence interval is, p^±Zα/2*p^(1-p^)n The formula for margin of error…

Q: 116 students at a college were asked whether they had completed their required English 101 course,…

A: Given that, n = 166 x = 82 Confidence level 99%

Q: A telephone poll of 1,000 adult Americans was reported in an issue of a news magazine. One of the…

A: A telephone poll of 1,000 adult Americans was reported in an issue of a news magazine. One of the…

Q: You sample 33 people to see if they own a dog, and find that 42% of them (rounded) do own a dog.…

A: The random variable X follows binomial distribution. X ~ B (n, p) = > X ~ B (33, 0.42). We have…

Q: What is the impact of changing from the 95% confidence interval to the 90% confidence interval? The…

A: Confidence Interval Confidence Interval refers to the range of the value that we expect our estimate…

Q: Hearts College found that 50 students out of a sample of 600 students take the subway to school.…

A: Given data is fit for difference of proportions. we need to find the confidence interval for 90%.

Q: You plan to conduct a survey to find what the proportion of the workforce has two or more jobs. You…

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Q: A health insurance firm wants to estimate the proportion of a population that would receive the flu…

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Q: Researchers conducted a survey to examine the difference between the proportion of females who vote…

A: Given that  X1= 85 n1= 200 X2= 124 n2= 220 p= x/n So p1= X1/n1 = 85/200 p1= 0.425 p2= 124/220 p2=…

Q: Several years ago, 43% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given  Several years ago, 43% of parents who had children in grades K-12 were satisfied with the…

Q: Graduation, again As in Exercise 29, we hope to esti-mate the percentage of adults aged 25 to 30 who…

A: It is given that, Where, C and E denote the confidence level and margin of error respectively. The…

Q: Construct the 90% confidence interval for the difference p1-p2 when x1=45, n1=85, x2=20, and n2=65.…

A: Given Information: x1=45n1=85x2=20n2=65c=90%=0.90

Q: Several years ago, 44% of parents who had children in grades K-12 were satisfied with the quality of…

A: We have given that 44% of parents who had children in grades K-12 were satisfied with the quality of…

Q: Hello, can you please help me solve this question ? This is a confidence interval level question :…

A: Confidence interval: The (1-α) % confidence interval for proportion p is given by,

Q: What does the 95% represent in a 95% confidence interval

A: Solution CI=95%

Q: A major grocery store chain is trying to cut down on waste. Currently, they get peaches from two…

A: Option (d) We are 95% confident that the proportion of on-sell able items for Whole Fruits is…

Q: You are going to construct a 99% confidence interval for the proportion of hip replacement…

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Q: A 95% confidence interval is narrower than a 90% confidence interval for the same data set. O True O…

A: We have to find given probability.

Q: A statistics instructor was interested in the proportion of all Kent State students who live on…

A: The proportion that students at Kent State live on campus is obtained below:From the given…

Q: If n = 440 and p = 0.52, construct a 90% confidence interval. %3D Give your answers to three…

A: Given information- Sample size, n = 440 Confidence level, c = 0.90 So, significance level (α) = 0.1…

Q: A psychologist asked a random sample to complete a depression questionnaire. On average, children…

A: The 95% confidence interval for the population mean depression score of children, will signify that,…

Q: A study was being done to estimate the proportion of students who receive financial aid. If the…

A:

Q: Each man in a random sample of n = 16 men between 30 and 39 years old is asked to do as many sit-ups…

A: We have given that,  Sample mean (x̄) = 24.2, standard deviation    (s) = 8 and sample size (n) = 16…

Q: What is the effect on the size of the confidence interval if a T score is used instead of a Z score?…

A: The formula for calculating confidence interval using Z score is as follow:

Q: Several years ago, 43% of parents who had children in grades K-12 were satisfied with the quality of…

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: Briefly describe the relationship between confidence interval and hypothesis testing.

A: Briefly describe the relationship between confidence interval and hypothesis testing.   A 95% CI…

Q: 59% of 81 delegates in a political convention favored changing the rules to restrict the number of…

A: n= 81P^ = 0.59CI = 0.95P(-z < P <z) = 0.95∴z= 1.96    (∵ z- table)

Q: Several years ago, 46% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given  p=0.46, n=1055, X=488

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.