A population's standard deviation is 15. We want to estimate the population mean with a margin of error of 4, with a 98% level of confidence. How large a sample is required? (Round your intermediate calculations to 2 decimal places and round up your answer to the next whole number.)

Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…

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

A: Here, standard deviation is 37.4 and margin of error is 3. We will find samples by margin of error.…

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

A: σ=41.6,E=1,CI=99%=0.99α=1−CI=1−0.99=0.01

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

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Q: How many light bulbs must a company test to determine the mean number of hours that they will last?…

A: Given that, The company wants to be 90% confident that their mean is within 40 hours of the…

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

A: Answer: From the given data, Margin of error (ME) = 1.6 Standard deviation(σ) = 19.7 95% confidence…

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

A: Here, the estimate would be within 2 of the true population mean 95% of the time. Hence, the margin…

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

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Q: You throw a ball as far as you can 5 times, recording the distance for each throw: 165 feet, 184…

A: since only 5 observation is given we will consider them as sample (n = 5)and population (N = 100)…

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

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Q: Several anthropology students are unprepared for a surprise true/false test with 17 questions, and…

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Q: spending on the birthday parties. How many parents do you have to sample? n =

A:

Q: A normal population has mean  μ  =  51  and standard deviation  σ  =  7 . What is the  85…

A: Given:µ = 51σ = 7Find P85In TI-84 calculator (if you have). Step 1: Press "2nd" then "Vars"Step 2:…

Q: You want to obtain a sample to estimate a population mean age of the incoming fall term transfer…

A: The population standard deviation, The margin of error, The confidence interval is 95% (i.e. )

Q: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Find the IQ…

A: Excel formula: =NORMINV(0.305,0,1)=-0.5100

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: ou want to estimate the mean number of sentences in a magazine advertisement.  How many magazine…

A: Given : the sample mean is within an error of 3 sentences = Required margin of error = 33…

Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A:

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

A:

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

A:

Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A:

Q: the average grade is 84 with a standard deviation of 4. What is each grade for -1 2 0 1.5 -1.25

A: Given Mean μ=84Standard deviation σ=4 The formula for Z score isZ=X-μσX=Z×σ+μ

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

A: The standard deviation of the distribution of the population is given as: σ=66.3. The desired level…

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

A: Given Population standard deviation=σ=21.4 Margin of error=estimated population mean=5 Confidence…

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

A: Given Population standard deviation= σ=46.3 Margin of error=10 Confidence interval=99%

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

A: It is given that confidence level is 0.98, the population standard deviation is 66.1 and the margin…

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

A: It is given that confidence level is 0.99, the standard deviation is 37.4, and margin of error E is…

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

A: It is given that confidence level is 0.98, population standard deviation is 79.9 and margin of error…

Q: You want to estimate the mean number of sentences in a magazine advertisement. How many magazine…

A: From the provided information,Confidence level = 95%

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

A:

Q: A normal population has mean u = 58 and standard deviation o = 8.. What is the 83rd percentile of…

A: Here we need to find the 83rd Percentile of the given normal distribution.

Q: the mean is 146, and standard deviation is 35. A score of 181 is how many z-scores above the mean?

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Q: You wish to estimate the average weight of a mouse. You obtain 10 mice, sampled uniformly at random…

A: Given data is 21,23,27,19,17,18,20,15,17,22sample size(n)=10Standard error(SE)=0.25

Q: You plan to build a 95% confidence interval estimate of the mean of a large population. You want a…

A: Givenconfidence level=95%Margin of error(E)=10standard deviation(σ)=200

Q: A researcher is interested in finding a 95% confidence interval for the mean number minutes students…

A: Note: Hi there! Thank you for posting the questions. As there are several independent questions,…

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

A:

Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A: Given that  Margin of error=E=10 σ=24.3

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

A: Answer - The population standard deviation  = 61.8                99% confidence interval         ⇒…

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

A: We have to find sample size for given data.

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

A: Sample size = sample size is the number of completed responses your survey receives or (randomly…

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

A: Solution-: Given: σ=60.1,M.E.=E=1.5,c=0.90 We want to find n=?

Q: A researcher is 95% confident with the estimate of a sample, of standard deviation of 10, that the…

A: We want to find the sample