We wish to estimate what percent of adult residents in a certain county are parents. Out of 600 adult residents sampled, 186 had kids. Based on this, construct a 90% confidence interval for the proportion of adult residents who ate perents in this county.

Q: Identify the t -scores for a 90% confidence interval if the sample size is 25?

A: Givensample size(z)=25α=1-0.90=0.10α2=0.05

Q: Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If…

A: Given information Error = 4% = 0.04 Confidence level = 0.95

Q: In a survey of 3005 adults aged 57 through 85 years, it was found that 81.7% of them used at least…

A: Given :  n = 3005 p̂=0.817

Q: Suppose the desired confidence level is fixed, then what is the effect of a larger sample size on…

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Q: What is meant by saying that a 1-a confidence interval is a. exact?b. approximately correct?

A: a.Confidence Interval:Confidence interval is the interval estimate of the population parameter. It…

Q: We would like to know: "What percentage of college students drink alcohol every day?" In a random…

A: Given that, N=500 X=75

Q: Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If…

A: Given information Error = 2% = 0.02 Confidence level = 0.95

Q: In a survey of 3234 adults aged 57 through 85​ years, it was found that 88.9% of them used at least…

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Q: Generally speaking, what is the difference between a confidence interval and a prediction

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Q: Is the difference between the two indicators significant at the 95% confidence level?

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Q: Suppose we want to estimate the proportion of teenagers (aged 13-18) who are lactose intolerant. If…

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Q: What is the impact on the confidence interval estimate if a larger sample is used?

A: Confidence interval:

Q: What is the t-value for a 95% confidence interval given that the sample size is 16? Write the exact…

A: Given: confidence level =95%  Sample size n=16  Then degree of freedom for t-test is =n-1  To find…

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

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Q: We wish to estimate what percent of adult residents in a certain county are parents. Out of 500…

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Q: Determine from a confidence interval whether a test is significant?

A: Null hypothesis states that there is no difference between populations or a set of given…

Q: What is the effect of sample size on the width of a confidence interval?

A: If the sample size is increased, then the corresponding margin of error is decreased. Hence, the…

Q: What is the margin of error for a 90% confidence interval?

A: It is given that Sample size n = 850 Number of residents support property tax, X = 410 The critical…

Q: While it is an uncommon confidence level, find the critical value that corresponds to a confidence…

A: It is given that the confidence level is 0.822.

Q: Professor Smith loves dark chocolate, and she would like to find out the proportion of the…

A: Given Information: Sample size (n) = 850 Out of which x = 600 people chose dark chocolate.…

Q: In a survey of 3473 adults aged 57 through 85​ years, it was found that 84.6% of them used at least…

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Q: To construct a confidence interval, we have to make three assumptions. explain what are those…

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Q: In a survey of 3485 adults aged 57 through 85​ years, it was found that 86.4​% of them used at least…

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Q: Suppose you are planning to construct a 23% confidence interval for a one sample population…

A: We have given that confidence level (c) = 23% = 0.23

Q: The following table shows the results of a survey in which 1017 adults from the United States, 1060…

A: (1)

Q: If a researcher uses 90% confidence level, what is the level of significance?

A: We have given that,  Confidence level  (C.I) = 90% = 0.90 Then,  We will find the level of…

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 A confidence interval for μ?

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Q: To determine the proportion of Americans who support affirmative action policies for minorities and…

A: The objective is to define the sample size for estimating the true proportion of Americans, who…

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: if you increase the sample size and confidence level at the same time. what will happen to the width…

A: The formula for the confidence interval (say) for population mean is :  C.I= x ± zα/2.s2n As the…

Q: Suppose we would like to estimate the proportion of all NBA fans who thought Aaron Gordon won the…

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Q: What is the difference between the different confidence interval formulas?

A: Confidence interval is the estimate of the interval of an unknown population parameter. It provides…

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

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Q: 1. How can you make a 95% confidence interval smaller without changing the confidence level?

A: Confidence interval is an interval such that the probability of the unknown parameter to be included…

Q: ) In a Gallup poll, 1011 adults were asked if they consume alcoholic beverages and 64% of them said…

A: 11. Given information: The sample size is 1011 adults. 64% of them said that they did. That is,…

Q: Your analysis of the raw data indicates that 16 of the 30 students reported driving no more than 20…

A: From the given information, let X be the number of students reported no more than 20 miles per day.…

Q: A quality control specialist wants to estimate the percentage of defective batteries within 5% from…

A: A quality control specialist wants to estimate the percentage of defective within 5% from the true,…

Q: It is known that the population range equals 60. With a 95% confidence level, the sample size that…

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Q: identify the population proportion, the value of margin of error E, and construct the confidence…

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Q: When computing a confidence interval, the size of the error term depends on what?

A: The formula to calculate the error term for confidence interval is as follow:

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

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Q: Wisconsin Public Radio wants to duplicate a survey conducted in 2011 that found that 68% of adults…

A: From the provided information, Sample proportion (p̂) = 0.68 The z critical value at 90% confidence…

Q: What is the relationship between confidence intervals and hypothesis tests?

A: Confidence Interval:Confidence interval is the interval estimate of the population parameter. It is…

Q: What is the t-value for a 90% confidence interval given that the sample size is 26? Write the exact…

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Q: A transportation planner wishes to estimate the proportion of commuters who drive to work within…

A: The provided information are: Margin of error (E) = 0.05 Confidence level = 90%

Q: What is meant by saying that a 1−α confidence interval is a. exact? b. approximately correct?

A: a) 1−α confidence interval is Exact means that the probability that the unknown value of population…

Q: If a retailer would like to estimate the proportion of their customers who bought an item after…

A: Solution: 3. From the given information, confidence level is 0.90 and E=0.03.

Q: According to a poll taken in a certain​ country, when adults were asked whether they were​ thriving,…

A: Sample size (n) = 439 240 of them said that they were struggling that is x = 240. The sample…

Q: What is a confidence interval

A: The confidence interval in statistics is a type of estimation computed from the statistics of the…