A computer company randomly selects 100 computers from the production line to launch a new model, and finds that they have a standard deviation of 120 hours and an average runtime of 1800 hours. Find the confidence interval of 90% probability of the average lifetime of the computers manufactured by the company. O a) 2780.26-2819.74 O B) 1780.26-1819.74 OC) 1730.26-1839.74 O D) 1580.26-1919.74 O TO) 1760.26-1812.74

A computer company randomly selects 100 computers from the production line to launch a new model, and finds that they have a standard deviation of 120 hours and an average runtime of 1800 hours. Find the confidence interval of 90% probability of the average lifetime of the computers manufactured by the company. O a) 2780.26-2819.74 O B) 1780.26-1819.74 OC) 1730.26-1839.74 O D) 1580.26-1919.74 O TO) 1760.26-1812.74

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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A researcher surveyed 12 men who lost their fathers earlier in their lives. His survey included the age of the subjects when their fathers died and their confidence that they would someday be happily married themselves (100 point scale – higher score = more confidence). The results are shown below. Mx=15 My =60 SSx=348 SSy=5198 SPxy=933 Age Confidence Rating 12 34 8 30 11 89 21 69 15 55 7 38 18 78 23 66 22 89 19 79 9 35 15 58 Can you estimate a confidence rating for a man who lost his father at 30 years old? Why or why not?
A personal trainer determines that an individual will get the most benefit from a workout if they keep their heart rate at an average of 150 beats per minute during workouts. To determine if the individual is doing so successfully, a random sample of 30 workouts is selected from their fitness watch. A 95% confidence interval for these workouts reveals that the true mean heart rate while working out is between 158 and 167 beats per minute. Based upon this interval, what conclusion should be made about the hypotheses: Ho = 150 versus H 150 where u = this individual's true mean heart rate during working out at a = 0.05? Reject Ho. There is convincing evidence that the mean heart rate from these 30 workouts differs from 150. Reject Ho. There is convincing evidence that this individual's true mean heart rate while working out differs from 150. Fail to reject Ho. There is not convincing evidence that the mean heart rate from these 30 workouts differs from 150. Fail to reject Ho. There is not…
A random sample of 500 patients with diabetes were weighed before and after switching to a new drug and the change in their weight is computed for each patient. The resulting 90% confidence interval for the average change in the weight of diabetes patients is (1, 5) expressed in pounds. Which of the following can be the 95% confidence interval generated from the same data?
A researcher surveyed 12 men who lost their fathers earlier in their lives. His survey included the age of the subjects when their fathers died and their confidence that they would someday be happily married themselves (100 point scale – higher score = more confidence). The results are shown below. Mx=15 My =60 SSx=348 SSy=5198 SPxy=933 Age Confidence Rating 12 34 8 30 11 89 21 69 15 55 7 38 18 78 23 66 22 89 19 79 9 35 15 58 The effect size is equal to _____________ . This means it is a ______________ effect.
A manufacturer of MP3 players conducts a set of comprehensive tests on the electrical functions of its product. All MP3 players must pass all tests prior to being sold. Of a random sample of 700 MP3 players, 14 failed one or more tests. Find a 99% confidence interval for the proportion of MP3 players from the population that pass all tests.
Estimate the average number of years they stay at their current house for all citizens living in that area with 95% confidence.
An accounting firm annually monitors a certain mailing service's performance. One parameter of interest is the percentage of mail delivered on time. In a sample of 346,000 items mailed between Dec. 10 and Mar. 3—the most difficult delivery season due to bad weather and holidays—the accounting firm determined that 241,300 items were delivered on time. Use this information to make a statement about the likelihood of an item being delivered on time by that mailing service. Assuming a confidence level of 95%, the likelihood of an item being delivered on time (when it was mailed between Dec. 10 and Mar. 3) is in the interval (enter your response here,enter your response here). (Round to four decimal places as needed.)
4) Estimate the average number of years they stay at their current house for all citizens living in that area with 95% confidence.
According to a study, brain weights of men in country A are normally distributed with mean 1.49 kg and standard deviation 0.14 kg. Apply the empirical rule to complete each sentence. Complete parts (a) through (d). a. Complete the sentence "Approximately 68% of the men have brain weights between _____ kg and _____ kg." Approximately 68% of the men have brain weights between nothing kg and nothing kg.
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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