In a survey, the planning value for the population proportion is p*=0.25 . How large a sample should be taken to provide a 95% confidence interval with a margin of error of 0.08 ? Round your answer to next whole number. _____

Q: You measure 47 watermelons' weights, and find they have a mean weight of 80 ounces. Assume the…

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Q: You are conducting an experiment to examine the anxiety levels of a group of Psychology students.…

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Q: How large a sample should be selected to provide a 90% confidence interval with a margin of error of…

A: Given,population standard deviation(σ)=60margin of error(E)=9α=1-0.90=0.1α2=0.05Z0.05=1.645

Q: A sample of 15 Math SAT scores for women was collected. The mean score for the sample was 472 and…

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Q: You want to obtain a sample to estimate a population mean. based on previ evidence, you believe the…

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Q: Assume that you want to construct a 95% confidence interval estimate of a population mean. Find an…

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Q: Find a 95% confidence interval for a mean, µ, where n = 324, x̄ = 2.7, s = .91, and se = .06.

A: Given: n = 324, x̄ = 2.7, s = .91, se = .06.

Q: 61 students are asked in a survey how many hours they work during a week. Their responses have a…

A: The random variable X follows normal distribution. The sample size is 61. The sample mean is 24. The…

Q: a 95% confidence interval estimate for population mean is determined to be 75.38 to 86.52. if the…

A: We have  to find the confidence level is reduced to 90%, the confidence interval will....

Q: How large a sample should be selected to provide a 95%  confidence interval with a margin of error…

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Q: If n=380 and X = 304, construct a 90% confidence interval. Give your answers to three decimals…

A: Given,n=380 ,x=304p^=xnp^=304380=0.81-p^=1-0.8=0.2α=1-0.90=0.1α2=0.05Z0.05=1.645     (from Z-table)

Q: The following sample data are from a normal population: 11, 9, 13, 16, 14, 12, 7, 6.   What is the…

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Q: You want to obtain a sample to estimate a population mean. based on previous evidence, you believe…

A: 99% ci for μ.E = 1.1σ = 18.2n = ?

Q: Find the margin of error for the confidence interval of population proportion. Lower bound  0.135.…

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Q: A sample of the reading scores of 30 fifth graders has mean of 62.the standard deviation of the…

A: Given,   Sample size = 30 Sample mean = 62 Population standard deviation = 15   The objective is to…

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Population standard deviation, sigma is 50. The z-critical value for 95% confidence interval is…

Q: Determine the t score used for the confidence interval. Report to 3 decimal places. n 3 6 and 95%…

A: Solution: 23. From the given information, n=6 and the confidence level is 0.95.

Q: you want to obtain a sample to estimate a population mean. based on previous evidence, you believe…

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Q: You measure the weights of a simple random sample of 64 people from a population. The sample mean is…

A: Provided information is ; sample size(n) = 64 sample mean(x¯ ) = 55 kg Population standard deviation…

Q: Assume that population mean is to be estimated from the sample described. Use the sample results to…

A: Given95% confidence interval N=361 x = 59.1 seconds. z= 4.9 SecondsFind the margin of error?

Q: An IQ test is designed so that the mean is 100 and the standard deviation is 17 for the population…

A: For the distribution of IQ scores for normal adults at the population level, it is given that:…

Q: A Gallop Poll in 2015 found that 75% of respondents believed in an afterlife, 15% were not sure or…

A: Given Information :  A Gallop Poll in 2015 found that 75% of respondents believed in an afterlife,…

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Givenconfidence interval(c)=95%margin of error(E)=8standard deviation(σ)=10

Q: We would like to determine the mean value for a population. Given that the a sample of size 100 has…

A: The range where the population parameter is likely to occur is calculated using the confidence…

Q: ow large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Given Information: Confidence level = 95% = 0.95 Margin of Error = 5 Population standard deviation…

Q: A statistics practitioner took a random sample of 43 Note: For each confidence interval, enter your…

A: n = 43 standard deviation = 27 mean = 104 95% confidence interval for mean is given by  x±zα2*σn 104…

Q: Suppose you want to do a confidence interval for the mean age of your clients when X has a normal…

A: Given that, Critical values: Using the z-table, the critical value at 95% confidence level is

Q: If n = 180 and X = 144, construct a 99% confidence interval for the population proportion, p. Give…

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Q: Which of the following would result in the narrowest confidence interval? A sample size of 30 with…

A: Here we will use the concept of confidence interval  and using the formula of confidence interval we…

Q: Which of the following is the best estimate of the range of a population value given the sample…

A: Confidence interval is known as the probability that a population parameter will lie between a set…

Q: Last Wednesday, a random sample of 16 students were surveyed to find how long it takes to walk from…

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Q: 20. Suppose a 90% confidence interval is stated as (0.3011, 0.4189). What is the sample proportion…

A: The given 90% confidence interval for population proportion is, (0.3011, 0.4189) The upper limit is,…

Q: magine that you conduct a study and estimate that the prevalence of hypertension among employees of…

A: From the provided information, Sample proportion (p̂) = 0.24 Margin of error for a 95% confidence…

Q: Which one of the following statements about confidence intervals is false?   Given the same sample…

A: In this case, we need to identify the false statement for confidence interval.

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: The confidence level is 95%. Margin of Error, ME = 5 Population Standard deviation, σ=48.   With…

Q: The t-value (t - score) that would be used to construct a 99% confidence interval given a sample…

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Q: Using an ? = 0.04, a confidence interval for a population proportion is determined to be 0.55 to…

A: Answer  Given  level of significance [α] =0.04 a confidence interval for a population proportion is…

Q: A market surveyor wishes to know how many energy drinks teenagers drink each week. They want to…

A: Population standard deviation()=1.3Margin of error(E)=0.06

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated. The…

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Q: How large a sample should be selected to provide a  95% confidence interval with a margin of error…

A: It is given that the confidence level is 95% and the margin of error is 1. Assumed population…

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.