A federal report indicated that 17% of children under age 6 live in poverty in Nevada, an increase over previous years. How large a sample is needed to estimate the true proportion of children under age 6 living in poverty in Nevada within 2% with 99% confidence?

Q: Suppose you wanted to keep the confidence level at 90%, but you wanted to decrease the width of the…

A: The confidence interval depends on the three factors: Confidence level: The width of the confidence…

Q: A biologist is interested in studying the effect of vitamin supplements on deer mouse body length.…

A: Note: According to Bartleby, expert solve only one question and rest can be reposted.

Q: For any population, the sum of the deviation scores will be always equal to zero. true or false

A: Sum of deviation is given as: ∑i=1n(xi-a) Where, a=any arbitrary constant.

Q: A New York Times article reported that a survey conducted in 2014 included 36,000 ​adults, with…

A: A margin of error could be a statistical measurement that accounts for the difference between actual…

Q: Contrary to popular opinion, a psychologist claims that the mean IQ score of math instructors is…

A: The provided information is  n=25x¯=120σ=30µ=100 here the parameters are known then we use…

Q: According to Randall Financial, through April 25, 2018, 64% of companies reported profits had…

A: The proportion is 0.64, margin of error is 0.05, and confidence level is 95%. Computation of…

Q: Suppose you want to increase the level of confidence without reducing the precision. What can you…

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

Q: Your state is considering raising the legal age for consumption of alcoholic beverages to 21 years…

A:

Q: In a​ poll, 6969​% of the people polled answered yes to the question​ "Are you in favor of the death…

A: Obtain the value of the minimum number of surveyed people. The value of the minimum number of…

Q: In a​ poll, 69​% of the people polled answered yes to the question​ "Are you in favor of the death…

A: From the given question,69% of the people polled answered yes to the question.That means,…

Q: A marketing specialist wants to estimate the average amount spent by visitors to an online…

A:

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: a) Given,   Margin error = 0.02 Population proportion = 0.36   The objective is to find the sample…

Q: The principal of a school claims that 30% of grade 3 pupils stay in the playground after their…

A: Proportion is almost similar to the concept of probability. Proportion is a fraction of population…

Q: A federal report indicated that 22% of children under age 6 live in poverty in South Dakota, an…

A: Given,sample proportion(p^)=0.22margin of error(E)=0.04α=1-0.90=0.1α2=0.05z0.05=1.645

Q: The number of television sets coming off a production line each day is known to have a standard…

A:

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny . What…

A: A) Sample size obtained when he uses a previous estimate of 32%. As given he wishes the estimate to…

Q: In 2018, the General Social Survey asked a random sample of 1,414 adults "Have you ever been told…

A: a. A random sample of 1,414 adults are taken for a survey to ask question 'Have you ever been told…

Q: . A survey of folk music fans yields this 95% confidence interval estimate of the proportion of fans…

A: The 95% confidence interval for proportion of fans who love music of David Wilcox is 0.74 to 0.86

Q: A researcher wishes to be 95% confidence that her estimate of the true proportion of individuals who…

A: Given that  Confidence level (C) = 95%  The true proportion of individuals who travel overseas is…

Q: We want to estimate, with a maximum error of .02, the true proportion of all senior medical students…

A: compute sample size ( n ) = n=(Z/E)^2*p*(1-p)

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

A: Obtain the sample size. The formula of sample size is, Use EXCEL Procedure for finding the critical…

Q: It is often quoted that in a normal distribution, 95% of the data lies 1.96 deviations either side…

A: Let X be the random variable   X~ Normal (0, 1)

Q: (d) Develop a 95% confidence interval for this population proportion. (Round your answer to four…

A: The point estimate of proportion of respondent who lack confidence they will be able to afford…

Q: A federal report indicated that 14% of children under age 6 live in poverty in New Jersey, an…

A: Given information- Margin of error, E = 5% = 0.05 Confidence level, c = 90% Since we have given that…

Q: A nurse at a local hospital is interested in estimating the birth weight of infants. How large a…

A:

Q: It has been claimed that over 30 percent of entering college students have blood cholesterol levels…

A: The appropriate test for the given claim is one sample t test over the hypothesis, H0 : μ≥200 Ha ;…

Q: The test scores for a class of 155 students are computed. What is the location of the test score…

A: Given that  The test scores for a class of 155 students are computed n=155 Find the location of the…

Q: if the variance of the water temperature in a lake is 28°, then for how many days would a researcher…

A: It is given that margin of error (E) is 3 and the confidence level is 99%.

Q: A group of scientists are interested in finding out whether the days of rainfall during the spring…

A: Given: number of days of rainfall amount of maple syrup

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Solution: From the given information, confidence level is 0.99, p=0.25 and E=0.03.

Q: 4) Out of the 440 people surveyed, a 110 said they listen to Spotify at least one a month. With the…

A:

Q: Express the form of most of the confidence intervals that you will encounter in your study of…

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

Q: Your state is considering raising the legal age for consumption of alcohol beverages. How large a…

A: From the provided information, Margin of error (E) = 0.01 Confidence level = 99%

Q: Nearly one half of americans aged 25 to 29 are unmarried.  How large a sample is necessary to…

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

Q: A federal report indicated that 28% of children under age 6 live in poverty in Kentucky, an increase…

A: Given: The proportion of children under age 6 who live in poverty in Kentucky is p^=0.28. The margin…

Q: in a poll 51% of people polled answered yes to the question Are you in favor of the death penalty…

A: Given, p=0.51 M.E=0.02 α=1-0.94=0.06 As per z-distribution table, the critical value of z at 0.06…

Q: A quantitative data set has a size 50. At least how many observations lie within 3 standard…

A: Suppose X is a random variable with expectation, μ and standard deviation, σ. Then, for any positive…

Q: How many Biology students’ records need to be sampled to estimate the percentage who earn "A"s to…

A: The proportion is not provided therefore in worst case it can be assume as (p) 0.5. Margin of error…

Q: On a multiple choice test with 20 questions, each question has four possible answers, one of which…

A: We have to find the standard deviation for the number of correct answers.......

Q: A medical statistician wants to estimate the average weight loss of people who are on a new diet…

A: Solution: Given information: σ= 10  Population standard deviation E= 2 Margin of error C= 0.9=90%…

Q: How large a sample must be taken to be 99% confident that the estimate of the average time of…

A:

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny What size…

A:

Q: what sample size should a researcher take if he wants to estimate a population proportion to be 2%…

A: From the given information,   Margin error = 0.02 Assume sample proportion = 0.5   Critical value:…

Q: What percent of our campus is female? If no preliminary study is made to estimate, how large a…

A:

Q: How many people should I poll to guarantee the actual error on pN is less than e with 90%…

A:

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny . What…

A:

Q: A sample of n = 16 scores is selected from a population with μ = 80 with σ = 20. On average, how…

A: From the provided information, it is known that

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: a) Given that: p= previous estimate = 32% =0.32 e= error= 3%=0.03 z=critical value for confidence…

Q: How large a sample must be taken to be 99% confident that the estimate of the average time of…

A:

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.