For a specific confidence interval, the larger the sample size, the smaller the margin of error will be The best point estimator of the population mean is the sample mode. When the population standard deviation is unknown, value should be used in computing a confidence interval for a mean is Za/2. When a 99% confidence interval is calculated instead of a 95% confidence interval with n being the same, the margin of error will be larger.

Q: Find the critical value for the population mean if there are 756 cats in a sample and you want a 91%…

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Q: Suppose that the population standard deviation of students score is 20. what is the sample size so…

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Q: If a 92% Confidence Interval for the Population Mean is (67.8, 78.9), find its Margin of Error.

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Q: How large a sample should be selected to provide a 99% confidence interval with a margin of error of…

A: Given,standard deviation(σ)=50margin of error (E)=10α=1-0.99=0.01α2=0.005Z0.005=2.58

Q: he number of square feet per house are normally distributed with an unknown population mean and…

A: Given information- Sample size, n = 33 Confidence level, C = 90% Significance level, α = 0.1 So,…

Q: Suppose we know that a confidence interval is (27,35), with a margin of error of 4. Find the sample…

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Q: The standard deviation of the weights of elephants is known to be approximately 15 pounds.  We wish…

A: Sample mean = x̅ = 244 Sample size = n = 50 Population S.D = σ = 15 Standard Error = σ/√n  =…

Q: A research company wants to estimate the mean IQ score for the population of all high school…

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Q: A survey of 38 men found that the standard deviation is 3.3 and the average number of units for…

A: The sample size for men is 38, standard deviation is 3.3, and mean is 12.8. The sample size for…

Q: We test a new drug on 18 patients. We get a sample mean improvement of 15 with a standard deviation…

A: Introduction: The nature of the population distribution is not given here. The sample size of 18 is…

Q: researcher was interested in the mean corn yeild for farmers in Illinois. She took an SRS of 28…

A: Given that  Margin of error =E =3.5 Population standard deviation =13.25 95% confidence level.

Q: A random sample of 16 movies has been selected from a normally distributed population. If the mean…

A: Given that, a random sample of 16 movies has been selected from a normally distributed population.…

Q: How large a sample should be selected to provide a 95% confidence interval with a margin of error of…

A: Given : Margin of error = 5 α = 0.05 Population standard deviation = σ = 30 zα2 = z0.052 = 1.96

Q: Suppose that the population standard deviation of student scores is 20. What will be the sample size…

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Q: trol manager at a light bulb factory needs to estimate the mean life of a large shipment of light…

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Q: Suppose you want to plan a study where the margin of error for the true population mean height of…

A: 1. The margin of error for the true population mean height of adult women is 1 inch, and 4 inches as…

Q: In the general population, height is normally distributed with a mean of 168.7 cm and a standard…

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Q: hen you have two independent populations, explain the similarities and differences between the test…

A: Our aim is to explain the similarities and differences between the test of hypothesis for the…

Q: confidence interval for a population mean is (56,78), with a margin of error of 11. What is the…

A: From provided information, Confidence interval for population mean is (56, 78), with margin of error…

Q: The number of square feet per house are normally distributed with a population standard deviation of…

A: We have to calculate 80% confidence level margin of error.

Q: Suppose we need to construct a 95% confidence interval for the mean of a normal population with…

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Q: The mean diastolic blood pressure for a random sample of 70 people was 96 millimeters of mercury.…

A: given data  n = 70 x¯ = 96σ = 1190% ci for μ.

Q: A teacher gives a test to his class of 25 students. Since he wants to quickly obtain an estimate of…

A: The class of 25 students is considered as the population. Sample size n =12 Sample mean x¯=82 Sample…

Q: Find the critical value for a 94% confidence interval when the sample size is 51 and the population…

A: Given Level of significance ɑ=0.06 , n=51  Population standard deviations σ known

Q: the 95% confidence interval for estimating the population mean μ If sample mean X = 50, sample size…

A: We have given that  Sample size = 60 Sample mean = 50 Population standard deviation = 10.  95%…