A local firm in Quiapo Manila manufactures LED products that have a lifespan that is approximately normally distributed with a std. dev. of 40 hours. If a sample of 30 LED products has an average lifespan of 780 hours, find a 98% confidence interval for the population mean of all LED products produced by this firm. Choose 2 answers in nearest unit (ones) or in whole number. Example, if your answer is 888.83 SuS 899.56, choose 880 and 900. O 789 O 769 O 775 O 807 O 00E

A local firm in Quiapo Manila manufactures LED products that have a lifespan that is approximately normally distributed with a std. dev. of 40 hours. If a sample of 30 LED products has an average lifespan of 780 hours, find a 98% confidence interval for the population mean of all LED products produced by this firm. Choose 2 answers in nearest unit (ones) or in whole number. Example, if your answer is 888.83 SuS 899.56, choose 880 and 900. O 789 O 769 O 775 O 807 O 00E

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...

See similar textbooks

Similar questions

A local firm in Quiapo Manila manufactures LED products that have a lifespan that is approximately normally distributed with a std. dev. of 40 hours. If a sample of 30 LED products has an average lifespan of 780 hours, find a 98% confidence interval for the population mean of all LED products produced by this firm. Choose 2 answers in nearest unit (ones) or in whole number. Example, if your answer is 888.83 899.56, choose 880 and 900.
A local firm in Quiapo Manila manufactures LED products that have a lifespan that is approximately normally distributed with a std. dev. of 40 hours. If a sample of 30 LED products has an average lifespan of 790 hours, find a 98% confidence interval for the population mean of all LED products produced by this firm.
The population standard deviation for the height of college football players is 2.7 inches. If we want to estimate a 95% confidence interval for the population mean height of these players with a 0.65 margin of error, how many randomly selected players must be surveyed
The Excel file STATISTICSSTUDENTSSURVEYFORR contains the column YRAGE (a numerical variable that measures student age at the time of completing an online survey). For education purposes, consider this dataset to be a sample of size 60 taken from a much wider population for statistics students. Use R/Rcmdr to find a 97% confidence interval for the mean of the population. Choose the most correct (closest) statement below? a. Your confidence interval is (19.01790, 20.74877) yrs and it wider than a 90% confidence interval created from this data. b. Your confidence interval is (18.92152, 20.84515) yrs and is wider than a 90% confidence interval created from this data. c. Your confidence interval is (18.92152,20.84515)) yrs and is narrower than a 90% confidence interval created from this data. d. Your confidence interval is (19.01790, 20.74877) yrs and is narrower than a 90% confidence interval created from this data. YRAGE 25 18 19 17 20 19 18 21 18 17…
The World Bank reports that 1.7% of the US population lives on less than $2 per day. The Governor ofUtah wants to know if Utah differs from this national average. To investigate this question, researcherstake a random sample of 500 households in Utah and find that 10 of the 500 households live on lessthan $2 per day. Is there evidence that Utah differs from the national average? Use a 95% confidencelevel.
There is no prior information about the proportion of Americans who support free trade in 2018. If we want to estimate a 97.5% confidence interval for the true proportion of Americans who support free trade in 2018 with a 0.16 margin of error, how many randomly selected Americans must be surveyed?
A local department store took a random sample of 64 charge accounts and found that the average balance was $63.19 with a sample standard deviation (s) = $12.50. Find a 90% confidence interval for the average balance due at this store.
The operations manager of a large production plant would like to estimate the mean amount of time a worker takes to assemble a new electronic component. Assume that the standard deviation of this assembly time is3.6 minutes. a) After observing 120 workers assembling similar devices, the manager noticed that their average time was 16.2 minutes. Construct a 90% confidence interval for the mean assembly time. b) How many workers should be involved in this study in order to have the mean assembly time estimatedup to ±15 seconds with 90% confidence?
The operations manager of a large production plant would like to estimate the mean amount of time a worker takes to assemble a new electronic component. Assume that the standard deviation of this assembly time is 3.0 minutes. After observing 136 workers assembling similar devices, the manager noticed that their average time was 23.2 minutes. Construct a 95% confidence interval for the mean assembly time.