Stock Prices A random sample of stock prices per share (in dollars) is shown. Find the 90% confidence intervals for the variance and standarddeviation for the prices. Assume the variable is normally distributed. Round the sample variance and final answers to three decimal places.13.88 26.69 14.75 46.1210.87 40.25 60.50 28.0028.25 6.94 45.12Send data to Excel0< <00<<0XSeBo

From the provided information, Confidence level = 90% Sample size (n) = 11

Answered: Stock Prices A random sample of stock…

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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Lifetimes of Wristwatches A random sample of the lifetimes of 28 inexpensive wristwatches has a standard deviation of 4.6 months. Assume the variable is normally distributed. Use the chi-square distribution table to find any chi-square values to three decimal places. Round your final answers to one decimal place. Find the 98% confidence intervals for the variance and standard deviation
Fast-Food Bills for Drive-Thru Customers A random sample of 40 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $16.68 per car. The population standard deviation is $4.89. Estimate the mean bill for all cars from the drive-thru with 98% confidence. Round intermediate and final answers to two decimal places.
Fast-Food Bills for Drive-Thru Customers A random sample of 50 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $19.96 per car. The population standard deviation is $4.83. Estimate the mean bill for all cars from the drive-thru with 93% confidence. Round intermediate and final answers to two decimal places. A <μ
Wheaties cereal is claimed to have an average of 3 grams of dietary fiber per serving. We want to test this hypothesis and to see whether we believe that is true or that the mean amount of fiber is significantly different from 3 grams. A random sample of 25 servings was taken and it yielded a sample mean of 3.4 grams with the sample standard deviation in the amount of fiber, s = .8 grams. %3D Assume that software has determined the p-value to be.02. Carry out the test at the 5% level of significance. Be sure to state your decision rule and your decision for the test. O Fail to Reject the null hypothesis since the p-value is .05 O Fail to Reject the null hypothesis since the p-value is > .05
Home Ownership Rates The percentage rates of home ownership for 8 randomly selected states are listed below. Estimate the population variance and standard deviation for the percentage rate of home ownership with 98% confidence. Round the sample variance and the final answers to two decimal places. 47.2 76.8 70.3 70.2 58.4 69.5 70.4 66.6 Send data to Excel 2 <²<[ X
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High School Competency Test A mandatory competency test for high school sophomores has a normal distribution with a mean of 380 and a standard deviation of 81. Round the final answers to the nearest whole number and intermediate z-value calculations to 2 decimal places. The top 4% of students receive $500, what is the minimum.co (b) The bottom 2% of students must go to summer school. What is the minimum score you would need to stay out of this group? The minimum score needed to stay out of this group is 0 X $
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Give typing answer with explanation and conclusion Suppose that the duration of trouble-free operation of a new vacuum cleaner is normally distributed with a mean of 550 days and a standard deviation of 100 days. The research department randomly selects 25 customers who bought these vacuum cleaners and records the duration (in days) of trouble-free operation. Which of the following is NOT TRUE for the sample average of number of trouble-free operation days ()? P (x̄ < 500) = P(Z < -2.5) P (x̄ > 600) = P(Z > 2.5) P (x̄ < 520) = P(Z < - 1.5) P (550 < x̄ < 580) = 0.9332
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