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QUESTION 1 Find the confidence level related to the critical value Za/2=1.555 O 88% O 12% O 93% 94% QUESTION 2 A research study reported a 95% confidence interval for the mean time of hip surgeries based on a sample of 91 patients as (116 minutes, 138 minutes). Which of the following statements is correct about the given interval? A. Incorrect B. Correct ✓ The mean time of hip surgeries of the 91 patients in the selected sample falls between 116 and 138 minutes. The mean time of hip surgeries of any sample of 91 patients will fall between 116 and 138 minutes. ✓95% of hip surgeries take between 116 and 138 minutes. We are 95% confident that the mean time of hip surgeries will be between 116 and 138 minutes. QUESTION 3 A survey of 64 popular restaurants is used to estimate the mean number of kitchen employees. Assume that the number of kitchen employees is right-skewed, which distribution should be used to construct the confidence interval? ONeither standard normal distribution nor t distribution Ot distribution with 63 degrees of freedom O Standard normal distribution t distribution with 64 degrees of freedom

QUESTION 1 Find the confidence level related to the critical value Za/2=1.555 O 88% O 12% O 93% 94% QUESTION 2 A research study reported a 95% confidence interval for the mean time of hip surgeries based on a sample of 91 patients as (116 minutes, 138 minutes). Which of the following statements is correct about the given interval? A. Incorrect B. Correct ✓ The mean time of hip surgeries of the 91 patients in the selected sample falls between 116 and 138 minutes. The mean time of hip surgeries of any sample of 91 patients will fall between 116 and 138 minutes. ✓95% of hip surgeries take between 116 and 138 minutes. We are 95% confident that the mean time of hip surgeries will be between 116 and 138 minutes. QUESTION 3 A survey of 64 popular restaurants is used to estimate the mean number of kitchen employees. Assume that the number of kitchen employees is right-skewed, which distribution should be used to construct the confidence interval? ONeither standard normal distribution nor t distribution Ot distribution with 63 degrees of freedom O Standard normal distribution t distribution with 64 degrees of freedom

MATLAB: An Introduction with Applications
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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QUESTION 1 Find the confidence level related to the critical value z 88% 12% 93% 94% Za/2=1.555 QUESTION 2 A research study reported a 95% confidence interval for the mean time of hip surgeries based on a sample of 91 patients as (116 minutes, 138 minutes). Which of the following statements is correct about the given interval? A. Incorrect B. Correct ✓ The mean time of hip surgeries of the 91 patients in the selected sample falls between 116 and 138 minutes. ✓ The mean time of hip surgeries of any sample of 91 patients will fall between 116 and 138 minutes. 95% of hip surgeries take between 116 and 138 minutes. We are 95% confident that the mean time of hip surgeries will be between 116 and 138 minutes. QUESTION 3 A survey of 64 popular restaurants is used to estimate the mean number of kitchen employees. Assume that the number of kitchen employees is right-skewed, which distribution should be used to construct the confidence interval? Neither standard normal distribution nor t distribution t distribution with 63 degrees of freedom Standard normal distribution Ot distribution with 64 degrees of freedom
Transcribed Image Text:QUESTION 1 Find the confidence level related to the critical value z 88% 12% 93% 94% Za/2=1.555 QUESTION 2 A research study reported a 95% confidence interval for the mean time of hip surgeries based on a sample of 91 patients as (116 minutes, 138 minutes). Which of the following statements is correct about the given interval? A. Incorrect B. Correct ✓ The mean time of hip surgeries of the 91 patients in the selected sample falls between 116 and 138 minutes. ✓ The mean time of hip surgeries of any sample of 91 patients will fall between 116 and 138 minutes. 95% of hip surgeries take between 116 and 138 minutes. We are 95% confident that the mean time of hip surgeries will be between 116 and 138 minutes. QUESTION 3 A survey of 64 popular restaurants is used to estimate the mean number of kitchen employees. Assume that the number of kitchen employees is right-skewed, which distribution should be used to construct the confidence interval? Neither standard normal distribution nor t distribution t distribution with 63 degrees of freedom Standard normal distribution Ot distribution with 64 degrees of freedom
QUESTION 5 The health department is estimating the percentage of smokers among adults aged between 18 - 22. A random sample of 50 students was used and 16 are reported as smokers. Find the corresponding critical value for calculating 97.5% confidence interval. Round your answer to three decimal places. QUESTION 6 A company owns 520 cars, the manager wants to know what is the mean distance traveled during the past 30 working days. So she gathered the information for 13 cars. Assuming the distances traveled are normally distributed. Find the corresponding critical value for calculating a 90% confidence interval. Round your answer three decimal places if needed. QUESTION 7 The daily electrical energy consumption (in Watts) during July for a random sample of 16 households was recorded. The mean was 3307 W and the standard deviation was 327 W. Assume the underlying distribution of the consumption is normal. Find the lower confidence limit (LCL) of the 95% confidence interval for the mean daily electrical energy consumption during that month. Round your answer to the nearest whole number (integer). QUESTION 8 The daily electrical energy consumption (in Watts) during July for a random sample of 49 households was recorded. The mean was 4377 W and the standard deviation was 335 W. Find the upper confidence limit (UCL) of the 95% confidence interval for the mean daily electrical energy consumption during that month. Round your answer to the nearest whole number (integer).
Transcribed Image Text:QUESTION 5 The health department is estimating the percentage of smokers among adults aged between 18 - 22. A random sample of 50 students was used and 16 are reported as smokers. Find the corresponding critical value for calculating 97.5% confidence interval. Round your answer to three decimal places. QUESTION 6 A company owns 520 cars, the manager wants to know what is the mean distance traveled during the past 30 working days. So she gathered the information for 13 cars. Assuming the distances traveled are normally distributed. Find the corresponding critical value for calculating a 90% confidence interval. Round your answer three decimal places if needed. QUESTION 7 The daily electrical energy consumption (in Watts) during July for a random sample of 16 households was recorded. The mean was 3307 W and the standard deviation was 327 W. Assume the underlying distribution of the consumption is normal. Find the lower confidence limit (LCL) of the 95% confidence interval for the mean daily electrical energy consumption during that month. Round your answer to the nearest whole number (integer). QUESTION 8 The daily electrical energy consumption (in Watts) during July for a random sample of 49 households was recorded. The mean was 4377 W and the standard deviation was 335 W. Find the upper confidence limit (UCL) of the 95% confidence interval for the mean daily electrical energy consumption during that month. Round your answer to the nearest whole number (integer).
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