A simple random sample of 60 items resulted in a sample mean of 80. The population standard deviation is o = 15.(a) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.)to(b) Assume that the same sample mean was obtained from a sample of 120 items. Provide a 95% confidence interval for the population mean. (Round your answers to twodecimal places.)to(c) What is the effect of a larger sample size on the interval estimate?A larger sample size does not change the margin of error.A larger sample size provides a smaller margin of error.A larger sample size provides a larger margin of error.

Answered: A simple random sample of 60 items…

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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COMPUTE FOR THE MARGIN OF ERROR OF THE FOLLOWING AND SHOW THE STEP-BY-STEP SOLUTION. 1. Confidence level = 99%, standard deviation (s) = 25, sample size (n) = 300 FILL IN THE TABLE WITH SOLUTIONS. STEPS SOLUTION STEP 1: STEP 2: STEP 3: STEP 4: STEP 5: Margin of Error: Conclusion:
During the 2009 holiday season, 436 randomly sampled American adults were surveyed regarding their average spending on Black Friday. A 95% confidence interval based on this sample is ($80.31,$89.11). (c) Determine the sample mean x and the sample standard deviation s of the sample. (d) Which would be the confidence level corresponding to an interval ($81.27,$88.15) for the data found in (c)? (e) If the values of the sample mean and sample standard deviation found in (c) do not change, find the sample size N for which a 99% confidence interval would have a margin of error smaller than 5.
When finding the upper bound, UU, of a confidence interval given the lower bound, LL, and the margin of error, EE, we use the formula U=L+2EU=L+2E. Find the upper bound for the proportion of babies that are born preterm if the lower bound is L=0.364L=0.364 and the margin of error is E=0.176E=0.176. Round your answer to 3 decimal places.U=
A researcher is trying to estimate the population mean (μ) of anxiety based on his sample of n = 16 scores. His sample M = 58 and the s = 5.36. Construct the 95% confidence interval for μ.
The interval [40 50] represents a 90% confidence interval for a population mean. Which of the following is most likely to be the corresponding 95% confidence interval? (Hint: in a normal distribution, close to 90% of the values are within 1.65 standard deviations of the mean and close to 95% of the values are within 2 standard deviations of the mean) O A. [42 48] В. [36 54] OC. [40 54] D. [30 60]
A researcher from a national reading program conducted a poll of 650 American adults over the age of 30-years-old and asked how many books they read over the past year. The researcher reported that American adults over the age of 30-years-old read a mean number of 13.5 books. The report included a margin of error of 1.25 books. (Assume 95% confidence was used.) Step 2 of 3 : Express the confidence interval mathematically. Do not round answers.
Q.4.1 Construct a 99% confidence interval for the true proportion of all employees ofPeople Plus Pty who believe that they should be given a raise by the company,given that 115 out of a sample of 135 employees support this suggestion.Interpret your answer.
Solve question #9 for part D only.
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
Please solve the a, b, c, and d.

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