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Q: 2. Why do we feel more confident with a 99 percent confidence interval than a 90 percent confidence…

A: It is needed to define the reason for being more confident for a 99% confidence interval than a 90%…

Q: What is the purpose of the confidence intervals in Statistics?

A: Confidence interval is derived from the Sample stastics for the estimatation of population…

Q: Suppose you want to produce an estimate on the percent of students who return to college after their…

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Q: In a survey of 1007 parents of children ages 8-14, 75% say they are willing to get a second or part…

A: The survey of 1007 parents of children 75% say they are willing to get a second or part time job…

Q: A biologist is studying fish diversity Lake Erie. The biologist knows that Black Carp are an…

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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: How to Construct a 99% confidence interval for the true proportion of all workers who believe that…

A: It is given that the sample size (n) is 130 and x is 100.

Q: A sociologist wants to construct a 94% confidence interval for the proportion of teenagers who uses…

A: Given, p=0.23 E=0.02 z value at 94% confidence is Zc=1.88 n=?

Q: What confidence interval will have the larger margin of error when using the same sample data and…

A: Since we know that, Confidence interval = the estimate ± the margin of error Margin of error is…

Q: Suppose we take a survey of 200 students and ask how much they study per week. The result is an…

A: From the above data  We are given that the  95% confidence interval is (10, 10.5). The population…

Q: In a survey of 800 parents, 632 said that music education has a positive effect on academic…

A: Sample size (n)=800 632 said that music education has a positive effect on academic performance We…

Q: Using the 99% level of confidence, what is the confidence interval for proportion of students…

A: Let X be the random variable such number of students attending home football games. X = 750 N: Total…

Q: Increasing the sample mean would cause a confidence interval to (a) shift left (b) shift right (c)…

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Q: 5) A polling company wants to conduct a poll that has a margin of error of no more than 3%. How many…

A: We know that formula for computing sample size is, n≥Zα2 E2  P×(1-P)   where,  n = sample size  P =…

Q: 2. n(1-P)= 3. N= If no N is given in the problem, use 1000000 N: Name the procedure The conditions…

A: Point and Interval estimate

Q: According to a survey conducted by Pew Research Center in June 2009, 44% of people aged 18 to 29…

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Q: Estimate 95% confidence interval for the proportion of household experiencing burglary in 2010."

A: 25.8 households per 1,000 were the victims of home burglary. These data are obtained from a survey…

Q: 7. In 2005 the New Jersey Adult Tobacco Survey found that 22.5% of 464 blacks surveyed said that…

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Q: It is believed that slightly over 50% of Americans own pets. A 95% confidence interval for the…

A: Confidence Interval: The form of the confidence interval is, CI = Point estimate ± Margin of error…

Q: What is the effect of increasing the confidence level on the margin of error?

A: The formula for calculating the margin of error is,   The margin of error is directly proportional…

Q: What is the relationship between α and the confidence level of a hypothesis test?

A: In hypothesis testing, α is the level of significance, which provides details about the chance of…

Q: In a survey of 1008 adults, a polling agency asked, "When you retire, do you think you will have…

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Q: In a survey of 1007 parents of children ages 8 to 14, 75% say they are willing to get a second job…

A: Given information- A proportion of parents say they are willing to get a second job or part-time…

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

A: Solution CI=95%

Q: The Nellie Mae organization conducts an extensive annual study of credit card usage by college…

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Q: What proportion of new drivers fail the written portion of their driver's license examination? You…

A: Given Data: p=196/500=0.392   n=500   z-value corresponding to 95% Confidence level=1.96

Q: In 2015 as part of the General Social Survey, 1131 randomly selected American adults responded to…

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Q: What is the difference between a prediction interval and a confidence​ interval? And when is it…

A: Confidence Interval :  Confidence intervals tell you how well you have determined a parameter of…

Q: You are trying to estimate the percent of people in California who have a college degree. You…

A: Given that  Sample size n =60 Favorable cases x =18 Sample proportion p^=x/n  =18/60 =0.3

Q: Suppose we take a survey of 400 students and ask how much they study per week. The result is an…

A: The 100 (1 – α)% confidence interval provides an interval estimation of the required population…

Q: 7. A recent survey of 500 women indicated that 29% of women over age 55 in the study were widows.…

A: Givensample size(n)=500p^=29%=0.29confidence level=90%

Q: How can someone recognize when an inferential statistics problem involves either a confidence…

A: Confidence interval is used to find the true value of the estimate of population parameter by using…

Q: % confidence interval for the mean percentage of airline reservations being canceled on the day of…

A: A 90% confidence interval for the mean percentage of airline reservations being canceled on the day…

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

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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: You wish to evaluate the differences in educational quality between two training centres (A and B).…

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Q: If there was a 95% confidence interval of say, (0.48, 0.68), about a product being preferred by…

A: The confidence interval at 100 (1 – α) % confidence level gives us an interval estimate about the…

Q: In a survey of 74 US females, 56 said they had gone to the dentist within the past year. What is…

A: Given X=56 n=74

Q: n 2013, the Gallup poll asked 1,039 American adults if they believe there was a conspiracy in the…

A: Given data, n=1039 x=634 sample proportion p=x/n =634/1039 =0.61   z-value at 90% confidence is…

Q: According to a survey conducted by Pew Research Center in June 2009, 44% of people aged 18 to 29…

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Q: On April 15th, 1912, the R.M.S. Titanic sank into the North Atlantic Ocean, resulting in the loss of…

A: Given, The proportion of survivors by each class here is computed as: p(crew) = 212 / 885 =…

Q: A Gallup poll of 1487 adults showed that 43% of the respondents have Facebook pages.  Construct a…

A: Confidence Interval: In statistics, we can say a range of values of the specified population…

Q: The national distribution of fatal work injuries in a country is shown in the table to the right…

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Q: A recent survey showed that 42% of US employers were likely to require higher employee contributions…

A: The proportion of all companies likely to require higher employee contributions for health care…