An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 800 hours and a standard deviation of 44 hours. Test the hypothesis that u = 800 hours against the alternative, u* 800 hours, if a random sample of 32 bulbs has an average life of 779 hours. Use a P-value in your answer. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Find the test statistic. O(Round to two decimal places as needed.) Find the P-value. O (Round to three decimal places as needed.) What is the appropriate conclusion for this test? Do not reject Ho and conclude that there is not sufficient evidence to conclude that the mean lifetime of the lightbulbs is not equal to 800 hours. In general, H, would be rejected for significance levels less than the P-value.

An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 800 hours and a standard deviation of 44 hours. Test the hypothesis that u = 800 hours against the alternative, u* 800 hours, if a random sample of 32 bulbs has an average life of 779 hours. Use a P-value in your answer. Click here to view page 1 of the standard normal distribution table. Click here to view page 2 of the standard normal distribution table. Find the test statistic. O(Round to two decimal places as needed.) Find the P-value. O (Round to three decimal places as needed.) What is the appropriate conclusion for this test? Do not reject Ho and conclude that there is not sufficient evidence to conclude that the mean lifetime of the lightbulbs is not equal to 800 hours. In general, H, would be rejected for significance levels less than the P-value.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Assume that adults have IQ scores that are normally distributed with a mean of 96.9 and a standard deviation of 17.3. Find the probability that a randomly selected adult has an IQ greater than 116.5.
The typical amount of sleep per night for college graduate students has a normal distribution with a mean of 5 hours. What is the standard deviation of this distribution if 16% of students sleep more than 6.5 hours? A. -1.52 B. -1.55 C. 1.52 D. 1.55
Someone claims that the systolic blood pressure of adults in the USA is nearly normally distributed with a mean of 125. The population standard deviation is 18. A random sample of 45 adults having systolic blood pressure of 160. Find the test statistic. Z = (Round to one decimal)
An analyst found that the average amount of money in bank accounts at his/her bank is $2,000 with a standard deviation of $150. What would be the variance?
The life of a toy is normally distributed. Suppose that 92.51% of the items have lives exceeding 2,160 hours and 3.92% have lives exceeding 17,040 hours. Find the mean and standard deviation of the toy lifetimes.
Assume that the time a student stays in school is normally distributed with a mean of 5 hours and a standard deviation of 0.5 hours. Every day, Ian stays in school for 5.5 hours. What proportion of student stays less than 5.5 hours?
The weight loss for the first six months of a diet program is normally distributed with an average 40 pounds and a standard deviation of 20 pounds. How much weight would a participant have to loss to be in the 90th percentile?
The probability that a patient recovers from a rare blood disease is 0.4. If 15 people are known to have contracted this disease, find the mean and standard deviation of the number of recoveries among 15 patients.
The playing life of a Sunshine radio has a Normal distribution with a mean of 600 hours and a standard deviation of 100 hours. What time frame would be considered unusual? What rule did you use to decide this?
The Alpha company takes a survey of the age for all employees. The average age is 35 with a standard deviation of 3.2 years. The results for a normal distribution curve. If the company has 985 workers, how many are over 44 years old?
The mean time it takes a group of students to complete a statistics final exam is 98 minutes, and the standard deviation is 9 minutes. Within what limits would you expect approximately 95% of the students to complete the exam? Assume the variable is approximately normally distributed.