How large a sample is needed (p= 0.70) if we wish to be 96% that our sample will be within 0.04 of the true fractions of population studied?

Q: By how many times does the sample size have to be increased to decrease the margin of error by a…

A:

Q: An epidemiologist is worried about the prevalence of the flu in East Vancouver and area. She will…

A: The smapleproprotion is caculated as: p = x/n=36/330 =0.1091   At a 95% confidence level, the z…

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A:

Q: You want to obtain a sample to estimate the proportion of a population that possess a particular…

A: Given that   Proportion having genetic marker (p) = 18% = 0.18 Confidence level (C) = 90%  The…

Q: Question 2: For the purpose of illustrating the procedures, assume we know that 70% of a population…

A: Sample 1:There are 21 individuals in the first sample who believe in climate change The sample…

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A:

Q: question 18 You want to obtain a sample to estimate a population proportion. Based on previous…

A:

Q: How large the sample size should be in order to be 98 percent confident, if the sample proportion is…

A: Given data, p=0.78 E=0.16 z-value at 98% confidence is Zc=2.326 n=?

Q: A sample with a mean of M=8 has an EZ= 56  how many scores are in the sample?   the number of…

A: Given that, Mean = M = 8 EZ= 56  n = ?   Definition of mean :  Mean is defined as sum of all…

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: a.Given no preliminary sample is taken to estimate proportion of small businesses that declared…

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: Solution: a. From the given information, confidence level is 0.99 and E=0.08. Since the proportion…

Q: You want to obtain a sample to estimate a population proportion. At this point in time, you have no…

A: We have to find out answer of given question....

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: a.   Formula for sample size is, Let us consider the population proportion is 0.5. Given that…

Q: You want to obtain a sample to estimate a population proportion. At this point in time, you have no…

A:

Q: Blood pressure Diastolic blood pressure in adults is normally |distributed with µ = 80 mm Hg and o =…

A: Solution: Given information: Let X be the diastolic blood pressure in adults is normally distributed…

Q: John has integers 1:10. He randomly draws 5 without replacement and reasons that he could estimate…

A: Introduction: When the man chooses a sample of five numbers between 1 and 10, both inclusive,…

Q: What percentage of the variation in  can be explained by the corresponding variations in  and  taken…

A: X1 is the dependent variable  X2 and X3 are the independent variables.

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: From the given information, the margin of error (E) is 0.12 and the confidence level is 0.98.

Q: Determine what proportion (n) of a population N of 4,000 will make your research work scientific in…

A: Given : Population Size (N) = 4000 Level of significance = 0.05 i.e Confidence level = 95% It means…

Q: Diastolic blood pressure in adults is normally distributed with m = 80 mm Hg and s = 12 mm Hg. In a…

A: The probability that diastolic blood pressure below 70 mm Hg is,

Q: What percentage of scores is between a z of ‐2 and a z of +2? Why is this important?

A: Use Empirical rule to solve it

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: Given Information :  The National Council of Small Businesses is interested in the proportion of…

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: Given no primilinary sample is taken to estimate proportion of small businesses that declared…

Q: Researchers conducted a survey among 400 doctors to ask the question; "Are you willing to treat your…

A: Given Sample size, n = 400  For a conservative case, we assume that the proportion of  patients…

Q: sample proportion is calculated from a sample size of 201. How large of a sample would we need in…

A:

Q: When estimating the true proportion, how large a sample is needed to be 95% confident that the error…

A: It is given that Margin of error E = 0.06 Level of confidence = 0.95 The critical value of Z at 95%…

Q: S For n= 15, the margin of error for an estimate at an alpha level of 2% is +2.249 15

A:

Q: a. What percentage of adult men can fit through the door without bending?

A: Let , X be the height of men. Here , X→N(μ=67.1 , σ=3.6) Since , the door height is 56.2 in. Our aim…

Q: a sample of ore is found to be 0.0012% diamond and 0.033% copper. What is the percentage of matter…

A: Given:- A sample of ore is found to be 0.0012% diamond and 0.033% copper To find:- The percentage of…

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A:

Q: You want to obtain a sample to estimate a populat proportion. Based on previous evidence, you belie…

A: We have given that,  Population proportion (p) = 68% = 0.68, margin of error (E) = 0.05 and…

Q: Repeat the process that you performed on the last problem for a) samples of size 20. Note the SE of…

A: From the given information we find the standard error and compare for sample size .

Q: The lengths of pregnancies in a small rural village are normally distributed with: μ = 269 0 = 15 In…

A: Given Mean=269 Standard deviations=15 Z=99.7%

Q: A researcher claims that the incidence of a certain type of cancer is less than 5%. To test this…

A: Test statistic calculation:In this context, a researcher claimed that the proportion of incidence of…

Q: By how many times does the sample size have to be increased to decrease the margin of error by a…

A:

Q: In a population with o = 8, a score of X = 44 corresponds to a z-score of z= -0.50. What is the…

A: Here, standard deviation is 8, X = 44, and z = –0.50.

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: (a) Given: Sample Size for 98% CI , E=0.12 without p^ Confidence level =98% Desired Margin of…

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: From the provided information, Margin of error (E) = 0.11 Confidence level = 95%

Q: When estimating the population proportion, how large a sample is needed to be 95% confident that the…

A: Here  sample proportion = 42/120= 0.35

Q: You want to obtain a sample to estimate a population proportion. At this point in time, you have no…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is, Here,…

Q: What is the value of SS for this sample?

A: Given: n = 4  Σ X = 4 Σ X 2 = 32 The formula to calculate the SS is as follows:

Q: 1. What percentage of scores fell within ±1 SD for ZADHD?

A: Introduction: The "ZADHD" values indicate the z-scores of ADHD.

Q: For this problem, carry at least four digits after the decimal in your calculations. Answers may…

A: It is given that confidence level is 0.98, and margin of error E is 0.10.

Q: You want to obtain a sample to estimate a population proportion. At this point in time, you have no…

A:

Q: You want to obtain a sample to estimate a population proportion. At this point in time, you have no…

A:

Q: Suppose that we want to estimate what proportion of gift items purchased at a department store are…

A: Given ME= 0.05 Confidence level=95℅

Q: (d) How high a score must you have in order to be in the top quarter of the population in social…

A: (d) The high score for order to be in the top quarter of the population in social insight is,…

Q: You want to obtain a sample to estimate a population proportion. At this point in time, you have no…

A: Given, Margin error (E) = 0.01 Assume sample proportion = 0.5   The objective is to find the sample…

Q: A recent study indicated that 24% of the 150 women over age 55 in the study were widows. Round up…

A: Given That  Margin of error =E =0.02 Population proportion p=24%=0.24 90% confidence interval.

Q: A sample of n = 9 scores has EX = 108. What is the sample mean? %3D The sample mean is

A: Given: Formula: