You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 39%. You would like to be 90% confident that your estimate is within 1.5% of the true population proportion. How large of a sample size is required? Hint: Video [-]

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: Givenmargin of error(E)=0.04confidence level(c)=95%

Q: Based on historical data in Oxnard college, we believe that 38% of freshmen do not visit their…

A:

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A:

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: Solution Critical value for Z: Refer Standard normal table/Z-table OR use excel function…

Q: Based on historical data in Oxnard college, we believe that 38% of freshmen do not visit their…

A:

Q: You wish to estimate, with 90% confidence, the proportion of tablet owners who use their tablets…

A: Solution: 1. From the given information, confidence level is 0.90 and E=0.02. Since the proportion…

Q: = 13 ould you expect to find the middle 50% of most pregnancies? and raw samples of size 45 from…

A: Given Mu=265 Standard deviation= 13

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A:

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A:

Q: Based on historical data at Oxnard College, we believe that 30% of freshman do not visit their…

A: Given Margin of error=E=0.05

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: Find z-critical value:…

Q: A simple random sample of 400 individuals provides 100 Yes response.  What is the estimate of the…

A: We know that,  If P is population proportion and  p^ is sample proportion then standard error of…

Q: Suppose that we wanted to estimate the true average number of eggs a queen bee lays with 99%…

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Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

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Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: Given Z=1.645 P=0.50 P cap=0.21

Q: You are interested in interviewing people who own both a cat and a dog.  The estimated incidence…

A: (1) The required sample size is calculated by using the formula, The critical value for 95%…

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: As per our guidelines we are supposed to answer only one question per post

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: Given data you work for a marketing firm that has large client. A margin of error 0.015 is given at…

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: a) When no prior research, the proportion (p̂) = 0.50 Margin of error (E) = 0.03 Confidence level =…

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A:

Q: Based on historical data in Oxnard college, we believe that 41% of freshmen do not visit their…

A: Given information Error = 4.5% = 0.045 Confidence level = 0.99 Proportion p = 0.41

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: Given Margin of Error, ME=0.04 Confidence=0.98

Q: Are Republicans less likely than Democrats to display the American flag in front of their residence…

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Q: Based on historical data in Oxnard college, we believe that 40% of freshmen do not visit their…

A: Given Data: p=0.4   z-value for 95% Confidence Interval=1.96   ME=0.04

Q: Provide an appropriate response. A researcher wishes to estimate the number of households with two…

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Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A:

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: The margin of error is, E = 0.04 If the prior information is unknown, assume that the sample…

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A:

Q: Based on historical data in Oxnard college, we believe that 78% of freshmen do not visit their…

A: Required margin of error = 0.015 78% of the freshmen do not visit their counselors regularly…

Q: You have been asked to estimate the proportion of households in Chicago that have two or more…

A: a) Given margin of error(ME)=4%=0.04 Confidence level=95% Significance level=5% The critical value…

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: Formula :

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: We have to find the sample size to estimate the proportion. In part (a), there is no prior research…

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

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

Q: etermine what percent of pre-kindergarten children ages 3 to 5 whose mother had a bachelor's degree…

A: When we don't have any prior information about the population proportion, we generally take it as…

Q: Based on historical data in Oxnard college, we believe that 33% of freshmen do not visit their…

A: Given that  Margin of error = 4.5%=0.045 Estimated population proportion pp = 33%=0.33…

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: here given , 0.015 margin of error and  level of confidence =0.98

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A:

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: Givenconfidence level = 80%Margin of error(E)=0.035

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: From the provided information, Margin of error (E) = 0.04 Confidence level = 90% Assuming the sample…

Q: The Nero Match Company sells matchboxes that are supposed to have an average of 40 matches per box,…

A: Given: μ = 40 σ = 8 n = 90 X = 43 α = 1% = 0.01 Formula Used: Test-statistic Z = X-μσn

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: From the provided information, Margin of error (E) = 0.02 Confidence level = 90% With prior research…

Q: What does brand loyalty mean to​ consumers? According to a recent research​ report, 38​% of…

A: From the provided information, Confidence level = 95% Margin of error = ±0.04

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: Givenmarign of error(E)=0.035level of confidence = 80%

Q: Based on historical data in Oxnard college, we believe that 30% of freshmen do not visit their…

A:

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A:

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: We have given that  Margin of error = 0.04 , and 95 % confidence level  Level of significance…

Q: You have been asked to estimate the proportion of households in Chicago that have two or more…

A: (a) Here, there is no information about the population parameter. Hence, use the conservative…

Q: What sample size is needed to give a margin of error within +2.5% in estimating a population…

A:

Q: You work for a marketing firm that has a large client in the automobile industry. You have been…

A: From the provided information, Margin of error (E) = 0.04 Confidence level = 90%

Q: Based on historical data in Oxnard college, we believe that 38% of freshmen do not visit their…

A: Find z-critical value: Refer Standard normal table/Z-table OR use excel function…

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.