Give a 99.8% confidence interval, for μ₁ −μ₂ given the following information.n₁ = 35, x₁ =1 2.41, s₁ = 0.3981n₂ = 20, x₂ = 2.62, s₂ = 0.832-0.21 ✓0.69X Use Technology Rounded to 2 decimal places. A school administrator wants to see if there is a difference in the number of students per class for PortlandPublic School district (group 1) compared to the Beaverton School district (group 2). Assume thepopulations are normally distributed with unequal variances. A random sample of 25 Portland classes founda mean of 32 students per class with a standard deviation of 6. A random sample of 26 Beaverton classesfound a mean of 36 students per class with a standard deviation of 3.Find a 90% confidence interval in the difference of the means. Round answers to 4 decimal places.

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Answered: Give a 99.8% confidence interval, for ₁…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A retrospective study of 100 pairs of twins was performed. The twin pairs each had one male child and one female child. Their birth weights were studied to determine if the male twin was consistently heavier. The difference in weights was calculated by subtracting the female weight (in ounces) from the male weight (in ounces): d=xm−xfd=xm-xf After looking at 100 pairs of twins, the study finds the 95% confidence interval for the mean difference of weights (in ounces) is: 1.9 < μdμd < 6.7 Can we be reasonably sure that the male twins are heavier than the females? Yes No Why or why not?
A random sample of 500 patients with diabetes were weighed before and after switching to a new drug and the change in their weight is computed for each patient. The resulting 90% confidence interval for the average change in the weight of diabetes patients is (1, 5) expressed in pounds. Which of the following can be the 95% confidence interval generated from the same data?
Suppose a new treatment for a certain disease is given to a sample of 180 patients. The treatment was successful for 153of the patients. Assume that these patients are representative of the population of individuals who have this disease. Calculate a 98% confidence interval for the proportion successfully treated. (Round the answers to three decimal places.)
You have measured the systolic blood pressure of an SRS of 25 company employees. A 95% confidence interval for the mean systolic blood pressure for the employees of this company is (122, 138). Which of the following statements is true? 95% of the sample of employees have a systolic blood pressure between 122 and 138. 95% of the population of employees have a systolic blood pressure between 122 and 138. If the procedure were repeated many times, 95% of the time the sample mean systolic blood pressure would be between 122 and 138. If the procedure were repeated many times, 95% of the resulting confidence intervals would contain the population mean systolic blood pressure. If the procedure were repeated many times, 95% of the time the population mean systolic blood pressure would be between 122 and 138.
If n=�=25, ¯x=�¯=45, and s=�=6, find the margin of error E� at a 95% confidence level. Give your answer to at least two decimal places.
If n=20, ¯xx¯(x-bar)=43, and s=10, construct a confidence interval at a 98% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal place.
If n=16, x¯(x-bar)=48, and s=7, construct a confidence interval at a 98% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal place.
Construct both 95% and 90% confidence interval for B, based on the information given BA, = -8.4, SSE = 146, SSxx = 64, %3D n = 20 %3D
You are interested in constructing a 99% confidence interval for the proportion of all caterpillars that eventually become butterflies. Of the 407 randomly selected caterpillars observed, 43 lived to become butterflies. Round answers to 4 decimal places where possible.
If n-10, 2(xbar)-40, and s-4, construct a confidence interval at a 98% confidence level. Assume the data. came from a iormally distributed population. Give your answers to one decimal place.
If n=17, ¯xx¯(x-bar)=50, and s=20, construct a confidence interval at a 98% confidence level. Assume the data came from a normally distributed population.
From chapter 14, review activity #19. A recent survey of 200 households showed that 8 had a single male as the head of the household. Forty years ago, a survey of 200 households showed that 6 had a single male as the head of the household. Car it be concluded that the proportion has changed, based on a 95% confidence interval? Recall the confidence interval is calculated as (-0.0261, 0.0461) A) Yes, the proportion changed since 0 is in the interval. B) Yes, the proportion changed since O is NOT in the interval. C) No, the proportion did not change since 0 is in the interval. D) No, the proportion did not change since 0 is NOT in the interval. E) We cannot determine the conclusion from the confidence interval

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Give a 99.8% confidence interval, for ₁ - 2 given the following information.