7.12 The mean and standard deviation of a random sample of nmeasurements are equal to 33.9 and 3.3, respectively.a. Find a 95% confidence interval for u if n = 100.b. Find a 95% confidence interval for u if n = 400.c. Find the widths of the confidence intervals you calcu-lated in parts a and b. What is the effect on the widthof a confidence interval of quadrupling the sample sizewhile holding the confidence coefficient fixed?

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Answered: 7.12 The mean and standard deviation of…

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 study was conducted to measure the effectiveness of hypnotism in reducing pain. The measurements are centimeters on a pain scale before and after hypnosis. Assume that the paired sample data are simple random samples and that the differences have a distribution that is approximately normal. Construct a 95% confidence interval for the mean of the "before-after" differences. Does hypnotism appear to be effective in reducing pain? Before After 6.3 6.8 2.4 7.3 11.8 8.3 7.5 3.4 5.4 2.3 7.9 8.6 8.1 6.3 3.3 2.7 Construct a 95% confidence interval for the mean of the "before-after" differences. -0.40
Find a confidence interval for u or p. a. A random sample of 19 adults participated in a four-month weight loss program. Their mean weight loss was 9.2 lbs, with a standard deviation of 2.5 lbs. Use this sample data to construct a 99% confidence interval for the population mean weight loss for all adults using this four-month program. You may assume the parent population is normally distributed. Round to one decimal place. > l> b. In the year 2000, a survey of 977 U.S. adults were asked who they felt was the greatest President. Of those surveyed, 197 reported that Abraham Lincoln was the greatest President. Use this data to construct a 90% confidence interval for the population proportion of all U.S. adults who would say that Abraham Lincoln was the greatest president before the year 2000. Answer using decimals and round to four decimal places
2.5 A confidence interval estimate is constructed around a. the degree of confidence b. the population parameter C. the population mean d. the point estimate 2.6 The z value that is used to construct a 95% confidence interval is: a. 2,58 b. 1.65 C. 1.96 d. 1.28 2.7 Which of the following is NOT a property of the student'st distribution? a. It's exact shape (i.e., spread) is characterized by the degrees of freedom b. It is symmetric c. All of the above are properties of the t distribution d. As the sample size grows, it gradually approaches the normal distribution
he mean and standard deviation of a random sample of n measurements are equal to 34.1 and 3.5, respectively. a. Find a 99% confidence interval for μ if n=144. b. Find a 99% confidence interval for μ if n=576.
A random sample of 88 observations produced a mean x=25.8 and a standard deviation s=2.5. a. Find a 95% confidence interval for μ. b. Find a 90% confidence interval for μ. c. Find a 99% confidence interval for μ. a. The 95% confidence interval is (enter your response here,enter your response here).
Determine the sample size needed to construct a 95% confidence interval to estimate the population mean when the population standard deviation is 563.11, and the margin of error is 73.48. Use two decimal places for the critical value and round to the nearest integer for your final answer. Eg. 48.47 = 49
A statistics class is estimating the mean height of all female students at their college. They collect a random sample of 42 female students and measure their heights. The mean of the sample is 65.3 inches and the sample standard deviation is 5.4 inches. Find the 90% confidence interval for the mean height of all female students in their school? Assume that the distribution of individual female heights at this school is approximately normal. 1. The t value is 1.3025 2. The standard error has a value of -- 3. The margin of error has a value of 4. Find the 90% confidence interval for the mean height of all female students in their school
Solve for D
I have only 30 min. Please help
Suppose a random sample of 400 is selected from a population with a standard deviation of 5. If the sample mean is 25, the 98% confidence interval to estimate the population mean is between ____________. 24.34 and 25.68 24.49 and 25.51 24.42 and 25.58 24.75 and 25.26 24.76 and 25.25
A research scholar wants to know how many times per hour a certain strand of virus reproduces. He wants to construct the 80 % confidence interval with a maximum error of 0.17 reproductions per hour. Assuming that the mean is 12.7 reproductions and the variance is known to be 3.61. what is the minimum sample size required for the estimate? Round your answer up to the next integer. AnswerHow to enter your answer (opens in new window) E Tables E Keypad Keyboard Shortcuts Ne Prev 2021 Hawkes Learning JIS A
-A -B Choose one (Would/Would not) and Is/Is not)

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