How large a sample should be selected to provide a 95% confidence interval with a margin of error of 6? Assume that the population standard deviation is 20. Round your answer to next whole number.
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How large a sample should be selected to provide a 95% confidence interval with a margin of error of 6? Assume that the population standard deviation is 20. Round your answer to next whole number.
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- In a survey, the planning value for the population proportion is p* = 0.25. How large a sample should be taken to provide a 95% confidence interval with a margin of error of 0.03? Round your answer up to the next whole number.If we want a 96% confidence interval on population mean with a sample size of 23, find z α/2 or t α/2 Group of answer choices: A) t = 2.183 B) z = 1.96 C) t = 2.177 D) z = 2.05Assume the mean and standard deviation of sample returns are 8% and 10% respectively. Assuming that the returns are normally distributed, what is the probability of an actual return below 8%?
- In a simple linear regression based on 20 observations, it is found b1 = 3.05 and se(b1) = 1.30. Consider the hypothesis : H0 : β1 = 0 and HA : β1 ≠ 0 . Calculate the value of the test statistic.Suppose that a sample is taken with an average of 110 and a standard deviation of 15. Calculate the z-score associated with a value of 130. Round your answer to two (2) decimal points.What is the mean of a binomial distribution in which the number of trials n = 100 and the probability of success p = 0.5? 550.0 500.0 0.500 50.00 100.0
- (2 points) Suppose that we are to conduct the following hypothesis test: Ho p H₁ == 1050 1050 στ == Suppose that you also know that σ = 250, n = 95, 1090, and take a = 0.1. Draw the sampling distribution, and use it to determine each of the following: A. The value of the standardized test statistic: Note: For the next part, your answer should use interval notation. An answer of the form (-00, a) is expressed (-infty, a), an answer of the form (b, x) is expressed (b, infty), and an answer of the form (-00, a) U (b, c) is expressed (-infty, a)U(b, infty). B. The rejection region for the standardized test statistic: C. The p-value is D. Your decision for the hypothesis test: A. Do Not Reject H₁. B. Do Not Reject Ho- C. Reject Ho D. Reject H₁.What is the standard deviation of a random variable q with the following probability distribution? (Do not round intermediate calculations. Enter your answer in numbers not in percentage. Round your answer to 4 decimal places.) Value of q 0 1 2 Probability 0.30 0.22 0.48 Standard deviationRound each z-score to the nearest hundredth.A data set has a mean of x = 6.2 and a standard deviation of 2.2. Find the z-score for each of the following. (a) x = 6.2(b) x = 7.2(c) x = 9.0(d) x = 5.0
- Suppose we have the following values for variables X and Y: XY 06 1 3 20 What is the value for the sample correlation coefficient (or r)? -0.9520 1Use @RISK's Define Distributions tool to draw a normal distribution with mean 500 and standard deviation 100. Then answer the following questions. Round your answers to three decimal places, if necessary.An investor experiences the following 5 annual returns. Calculate the sample variance of these returns. Write down the sample standard deviation, leaving your answer under the radical symbol. A)2% B)-3% C)-3% D)-2% E)1%