A marketing researcher for a phone company surveys 70 people and finds that the proportion of customers who are likely to switch providers when their contract expires is 15%. a) What is the standard deviation of the sampling distribution of the proportion?b) If she wants to reduce the standard deviation by half, how large a sample size would she need?

Q: Suppose the true proportion of voters in the county who support a new fire district is 0.42.…

A:

Q: It is known that 40% of all customers at a service station pay with a credit card. If a random…

A: Given  p=0.40, x=75, n=200

Q: The “best estimate” of the mean of a parent distribution, using a data set consisting of N samples,…

A: The given statement is,  The “best estimate” of the mean of a parent distribution, using a data set…

Q: Provide an appropriate response. A greenhouse in a tri-county area has kept track of its customers…

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Q: Samuel F.B. Morse (1791 – 1872), the creator of Morse Code, claimed that 12% of all letters used in…

A: The population proportion is 0.12. That is, p=0.12.

Q: 4)Incomes for production line workers in a certain city average $43.74 per hour with a standard…

A: We’ll answer the first question since the exact one wasn’t specified. Please submit a new question…

Q: Suppose the true proportion of voters in the county who support a specific candidate is 0.54.…

A: The proportion of voters in the country who support a specific candidate is =0.54.The sample number…

Q: 2. For a normal distribution, find the z-score location that divides the distribution as follows:…

A:

Q: Suppose the true proportion of voters in the county who support a school levy is 0.49. Consider the…

A:

Q: Find the standard deviation of the sampling distribution of p.

A: We have given that  n = 600 p̂ = 0.33

Q: Which statement is true? a. If the sampling plan is applied correctly there is no sampling risk b.…

A: attribute sampling - a statistical sampling plan used in test of controls. this is appropriate:…

Q: Historically, the proportion of car parks in a particular city that offer early discount fees is…

A: a. Consider that p is population proportion of car parks in a particular city that offer early…

Q: 4. Conduct a simple random sampling of 20 data points. Write them in the box. 98 98 99 99 99 99 99…

A:

Q: Suppose the true proportion of voters in the county who support a school levy is 0.65. Consider the…

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Q: en reported that 42.6 % of workers employed as purchasing managers are males. In a random sample of…

A: The sample proportion is calculated as: p^=xn=70200=0.35

Q: When working with the sampling distribution of a sample proportion, what do we need to require to…

A: Sampling Distribution of a Proportion There are several ways to calculate the sampling distribution…

Q: of adults are smokers. A random sample of 300 adults is obtained.

A: As given, Let X be the random variable such that number of adults who are smokers. According to the…

Q: 4. A sample mean has a z= +1.0 on the sampling distribution created from the population of…

A:

Q: Suppose that the efficacy of a certain drug is 0.53. Consider the sampling distribution (sample size…

A: Given data, p=0.53 n=105

Q: At a certain semiconductor manufacturing company in SBMA, the average salary of all final assembly…

A: Given:The research found out that the measures that descibe the width of distibution is.At a certain…

Q: The annual salary for one particular occupation is normally​ distributed, with a mean of about…

A: Population mean μ =136000 Population standard deviation =16000 Sample size n =30

Q: The U.S. Department of Transportation, National Highway Traffic Safety Administration, reported that…

A: Given , Sample size = n = 54 Number of intoxicated driver = x = 35 Sample proportion = p^ = 3554 =…

Q: It is known that 40% of all customers at a service station pay with a credit card. If a random…

A: Given : It is known that 40% of all customers at a service station pay with a credit card.

Q: A random sample of adult men was asked if they would return the money if they found a wallet on the…

A:

Q: Suppose the true proportion of voters in the county who support a specific candidate is 0.57.…

A: The mean is calculated by averaging all the observations. It is eventually calculated by summing all…

Q: (a) What is the level of significance? State the null and alternate hypotheses. о но: р 3D 0.77; H,:…

A: Since, you have posted a question with multiple sub-parts, we will solve the first three complete…

Q: Suppose the true proportion of voters in the county who support a new fire district is 0.35.…

A: the pdf of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

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Q: Suppose we are now interested in taking random samples of 800 US adults instead of 150 and…

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Q: The mean and variance of a sample of 25 data items are 78 and 100, respectively. Use Chebyshev's…

A:

Q: Suppose the true proportion of voters in the county who support a school levy is 0.39. Consider the…

A: Sample proportion is defined as the ratio of number of units that are favourable to a characteristic…

Q: 2.  A claim is made that the proportion of adults who text is less than 0.4.  Find the test…

A: Given that  p=0.40 , n=987 , X=398

Q: Suppose that 65% of the 310,000 citizens in a county are registered to vote. A non-profit…

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Q: If you were to draw 15 random samples of 100 residents in a city you may get 15 different mean…

A: statistical effect: The effect is the difference between the true population parameter and the null…

Q: In the textbook, a sampling distribution can be regarded as approximately normal when which…

A: Answer:-  Sampling data can be regarded as approximately normal when this conditions met:-

Q: Which of the following sampling methods was used in the study described below?  A researcher is…

A: There are various types of sampling procedures, which can be categorized into two groups:…

Q: Find the Mean and variance for the prompts below: State Farm Insurance Company reports that…

A:

Q: Consider a population proportion p = 0.27.  Calculate the standard error for the sampling…

A: It is given that population proportion p = 0.27.  The standard error of the sample proportion is…

Q: Compute the sample mean and sample deviation

A: The table that depicts the calculation is shown below: The mean can be calculated as: The variance…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.