L'Rglection Direction: Find the interval estimate of the following problem. 1. Aandom sample of 70 Grade 11 students at Lorma Colleges showed a mean monthly alowance of Php 3500.00 with a population standard deviation of Php. 100.00. On the assumption that the monthly allowance of the students is normally distributed a Construct a 90% confidence interval for the mean monthly allowance A Construct 95% confidence interval for the mean monthly allowance. 2 An electrical firm manufactures light bulbs for LCD projectors with life spans that are appronimately normally distributed. A randomly selected sample of 25 light bulbs have a mean life spen of 600 hours with a standard deviation of 50 hours. a Find 95% confidence interval for the population mean of all the light bulbs produced by the electrical firm? b. Find 99% confidence interval for the population mean of all the light bulbs produced by the electrical firm? 3. A marketing rescarcher randomly selects 20 female students in a certain university and found out that their average monthly expenditures for their cellphone loads is Php. 500.00 with a standard deviation of Php. 75.00. Find the 90% confidence interval for the average expenditures of female students for their cell phone loads.
L'Rglection Direction: Find the interval estimate of the following problem. 1. Aandom sample of 70 Grade 11 students at Lorma Colleges showed a mean monthly alowance of Php 3500.00 with a population standard deviation of Php. 100.00. On the assumption that the monthly allowance of the students is normally distributed a Construct a 90% confidence interval for the mean monthly allowance A Construct 95% confidence interval for the mean monthly allowance. 2 An electrical firm manufactures light bulbs for LCD projectors with life spans that are appronimately normally distributed. A randomly selected sample of 25 light bulbs have a mean life spen of 600 hours with a standard deviation of 50 hours. a Find 95% confidence interval for the population mean of all the light bulbs produced by the electrical firm? b. Find 99% confidence interval for the population mean of all the light bulbs produced by the electrical firm? 3. A marketing rescarcher randomly selects 20 female students in a certain university and found out that their average monthly expenditures for their cellphone loads is Php. 500.00 with a standard deviation of Php. 75.00. Find the 90% confidence interval for the average expenditures of female students for their cell phone loads.
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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Transcribed Image Text:L' Reflection
Direction: Find the interval estimate of the following problem.
1. A random sample of 70 Grade 11 students at Lorma Colleges showed a mean monthly
allowance of Php 3500.00 with a population standard deviation of Php. 100.00. On the
assumption that the monthly allowance of the students is normally distributed.
a Construct a 90% confidence interval for the mean monthly allowance.
b Construct 95% confidence interval for the mean monthly allowance.
2 An electrical firm manufactures light bulbs for LCD projectors with life spans that are
approximately normally distributed. A randomly selected sample of 25 light bulbs have a
mean life span of 600 hours with a standard deviation of 50 hours.
a Find 95% confidence interval for the population mean of all the light bulbs produced by
the electrical firm?
b. Find 99% confidence interval for the population mean of all the light bulbs produced by
the electrical firm?
3. A marketing researcher randomly selects 20 female students in a certain university and found
out that their average monthly expenditures for their cellphone loads is Php. 500.00 with a
standard deviation of Php. 75.00, Find the 90% confidence interval for the average
expenditures of female students for their cell phone loads.
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