What is the sample size if the outcome of interest has a 5% prevalence rate and the level of significance is equal to 5%? (Use Cochran's formula, e=5%) (Do not write any non-numeral character. Round-off to the nearest whole number)

Q: Because of practical considerations you ultimately decide to survey 100 people and find that 75 of…

A: Solution-: Number of people in survey =100 Number of people prefer to work at home = 75 We want to…

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

A: Introduction: The confidence interval for the population proportion, p at the 100 (1 – α) %…

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

A: Given: Refer Standard normal table/Z-table OR use excel function "=NORM.S.INV(1-0.005)" to find…

Q: According to past reports 48% of employees own a car. In a random sample of 250 employees, how many…

A: Total no.of employees=250 The percentage of employees own a car=0.48

Q: A random sample of 324 residents of a community revealed that 30% were very satisfied withthe…

A: Given that, Critical values: By using the standard normal table of Z, the critical value for two…

Q: After 5 points are added to each score in a sample, the mean is found to be M=45 . What was the…

A: Given data: c = 5 points are added to each score in a sample. New mean, M = 45 Let the original mean…

Q: According to College Board the scores on the AP History exam are normally distributed with N(72,…

A: It is given that the scores on the AP History exam are normally distributed with N(72, 7.5).

Q: The owner of a local bar specializing in alternative music wanted to determine the average age of…

A: t 95% confidence level, the z value is 1.96 which can be obtained by using the standard normal…

Q: I needed help with the questions I got wrong (marked by the red "X").

A: b) Probability=0.8415 c)σp̄=0.0189 d) Probability=0.9660 e)The probability of the sample proportion…

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

A: We have given that,  Population proportion (p) = 58% = 0.58, margin of error (E) = 4% = 0.04 and…

Q: A sample has SS= 20 and s2 =4. How many scores are in the sample?

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Q: A researcher wishes to estimate the proportion of corporate executives whose annual salary is over…

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Q: Suppose that Po * a = 75 and Po * a² %3D determine the value for a. Select one: O 0.73 O 22.22 O…

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

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Q: Use the expression in the accompanying discussion of sample size to find the size of each sample if…

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Q: What is the standard error of the sample proportion of people that like a product if you have a…

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Q: A recent survey amongst 240 randomly selected vendors in Durban showed that 84 of them felt that…

A: According central limit theorem, the sampling distribution of sample proportion follows the normal…

Q: A professor wishes to estimate the proportion of college students that have never cheated during a…

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Q: What percent of our campus is female? The Statistical Abstract of the United States, 112th edition,…

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Q: You recorded the time in seconds it took for 8 participants to solve a puzzle. The times were: 15.2,…

A: a.Obtain mean time took by participants to solve the puzzle.The data represents the time in seconds…

Q: In the population, the mean SAT score is 1000. Would you be more likely (or equally likely) to get a…

A: Given that the population mean is 1,000 and the samples sizes selected are 10 and 30.

Q: 0.4756 0.4756 z=? 0 z=?

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Q: How many households must you survey if you want to be 94% confident that your sample percentage has…

A: Margin of error  = 0.03 Confidence level =  94%

Q: Eric scored 107 on the IQ test. What is his exact percentile rank? M=100    s=15

A: Given, Mean, M=100 Standard deviation, S =15

Q: A sample of Reese's pieces contains the following: 23 Orange, 14 Brown, 18 Yellow.  What is the…

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Q: The data set {2,5, q, 10, 13, 16} has mean i = 9. Find the value of q.

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

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Q: if the 90% Ci for the population mean is (-1, 4.4) what is the sample mean a. can't be found b. 2.7…

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Q: what is the proportion of 12/10 and 18/15

A: let a=12/10 and b=18/15 then proportion of and b is written as=a:b=a/b

Q: How small are the smallest 2.5% of all bladders among women?

A: Given bladder volumes of women are normally distributed with mean 400 ml and standard deviation 75…

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

A: Given that p =0.68 , E =0.035 , alpha =0.05 n = ?

Q: 374 is 22% of the sample size. Find n

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Q: Using a random sample of 4300 TV households, a media research company found that 62.2% watched the…

A: n = 7100

Q: You are task to determine the number of respondents of a large population on a survey done by your…

A: Solution

Q: Use the expression in the accompanying discussion of sample size to find the size of each sample if…

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Q: What is the margin of error for a poll with a sample size of 2150 people? Round your answer to the…

A: The sample size is .The objective is to find the margin of error.

Q: A biologist wants to estimate proportion of humans who have a certain gene. He wants to be 95%…

A: We have to find sample size required.