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?

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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.

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

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

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Q: In a distribution with M = 3.40, SD = 1.47, what proportion of scores fall between 2.55 and 5.32?

A: Given that  M = 3.40, SD = 1.47 P(2.55<X<5.32)=?

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.…

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

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

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

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Q: The analysis of variance is a procedure that allows statisticians to compare two or more population:

A: To identify the correct option for the given statement.

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Q: 1. Consider a sample with data values of 2.20; 1.98; 1.95; 2.27; 2.25; 2,24; 2.31 Compute the mean.

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

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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.