Answered: 1: Find the confidence level related to…

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter4: Equations Of Linear Functions

Section: Chapter Questions

Problem 8SGR

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Question

1: Find the confidence level related to the critical value z_α/2=1.555

2: 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?

3: 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.

4: 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 to three decimal places if needed.

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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