or below the 8th grade level. In an early study the population proportion was estimated to be 0.21. How long how large a sample would be required in order to estimate the fraction of 10th graders reading at or below the 8th grade level at the 90% confidence level with an error of at most 0.03? Round your answer up to the next integer

Q: Kim wants to determine a 99 percent confidence interval for the true proportion of high school…

A: From the given information, Margin error (E) = 0.03 Assume sample proportion = 0.5   The objective…

Q: A random sample of  46  four-year-olds attending day care centers provided a yearly tuition average…

A: Solution

Q: Find the value of the sample size needed if the confidence interval is 95% that the sample…

A: Given that  Margin of error =E =0.04 Sample proportion p^=0.45

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A:

Q: You sample 36 families to find out how much they spent on groceries last month. Your sample mean is…

A: Given data,n=36x=540s=82α=0.05

Q: 37. In a sample of 34 full size down comforters, the average Welght with a variance of 2.6. Give a…

A: Given,

Q: Kim wants to determine a 80 % confidence interval for the true proportion ? of high school students…

A:

Q: A researcher found a 90% confidence interval for the proportion of restaurants which earned a profit…

A: From the provided information, Confidence interval is (0.489, 0.6518)

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

A:

Q: If n=27, (x-bar)=34, and s=3, find the margin of error at a 90% confidence leve Give your answer to…

A:

Q: Remember the formula for the 80% confidence interval of a single proportion(see picture) : what is…

A:

Q: A poll found that 78% of a random sample of 1085 adults said that they believe in ghosts. .***. a.…

A: Solution-: Given: We find margin or error (a) for 99% C.I.…

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: uct a survey on your college campus to learn about the political awareness of students. You want to…

A: The critical value from standard normal table at 95% confidence level will be:

Q: Suppose you survey a random sample from a large population to understand the population proportion.…

A: Given information- Margin of error, E = 6% = 0.06 Confidence level, c = 98% Since nothing is known…

Q: A confidence interval was constructed to approximate a population proportion. The interval was from…

A: We have given that,  Let p̂ represents the sample proportion and E represents the margin of error,…

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A:

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

A: Givensample size(n)=1421Americans who smoke(x)=454confidence level=90%

Q: Q15 The systolic blood pressures (in mmHg) of a random sample of adults have been recorded. A 95%…

A: Given that  95% confidence interval is (100, 125) Margin of error =E  Sample mean =X̄

Q: Heve, olsering f vslne (0:3502) < cntical frime [FI). There for, fails to rejaec the mill hyprtheis…

A: We know that, If Calculated F value is less than tabulated F i.e. (Fcal&lt; Ftab) then we fail to…

Q: survey, the planning value for the population proportion is p=0.3. How large a sample should be…

A: p=0.3 , margin of error=0.08

Q: Suppose you calculate a 95% confidence interval for a proportion to to be: 0.39 to 0.78. Determine…

A: Given,   Lower bound = 0.39​ Upper bound = 0.78   Here, we use to determine the margin of error.

Q: Statistics Canada wants to know the unemployment rate in Vancouver during any part of last year. How…

A: confidence level=90% Margin of error(E)=0.012

Q: Cora wants to determine a 90% confidence interval for the true proportion of high school students in…

A: Confidence level=90%Margin of error(E)=0.02Assuming that we have no prior estimate of the proportion…

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

A:

Q: A sample of 1100 observations taken from a population produced a sample proportion of 0.36 . Make a…

A: Given information Sample proportion = 0.36 Sample size (n) = 1100

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A:

Q: We are collecting data on the patients that have been vaccinated for the coronavirus, and the…

A: Given :The initial data shows a 90% success. We want the margin of error to be no more than 3%. We…

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…

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A:

Q: What sample size is needed to give a margin of error within +3% in estimating a population…

A:

Q: It is desired to estimate the proportion of cannabis users at a university. What is the sample size…

A: Here, CL=0.95 and E=0.10.

Q: Tina catches a 14-pound bass.  She does not know the population mean or standard deviation.  So she…

A: From the provided information, The data values are as follow: 9, 12, 13, 10 and 10 Sample size (n) =…

Q: In a survey, the planning value for the population proportion is p* = 0.25. How large a sample…

A: Given : Population proportion (p*) = 0.25 Confidence level = 95% So ; significance level (α) =…

Q: marine biologist would like to estimate the mean weight of all mahi mahi on the Treasure Coast,…

A: Formula for the sample size needed to estimate a population mean is