Construct the 95% confidence interval for mean life
a) The life hours of a 75-watt light bulb is known to be approximately normally distributed with standard deviation 25 hours. A random sample of 25 bulbs has a mean life of x 1050 hours.Construct the 95% confidence interval for mean life, .
Homework Answers
Request Answer!
We need at least 10 more requests to produce the answer.
0 / 10 have requested this problem solution
The more requests, the faster the answer.
The life in hours of a 75-watt light bulb is known to be normally distributed with...
The life in hours of a 75-watt light bulb is known to be normally distributed with = 23 hours. A random sample of 20 bulbs has a mean life of X= 1011 hours. Suppose that we wanted the margin of error in estimating the mean life from the two-sided confidence interval to be five hours at 95% confidence. What sample size should be used? Round up the answer to the nearest integer. Statistical Tables and Charts
The life in hours of a 75-watt light bulb is known to be normally distributed with...
The life in hours of a 75-watt light bulb is known to be normally distributed with σ = 27 hours. A random sample of 20 bulbs has a mean life of x Overscript bar EndScripts = 1015 hours. Suppose that we wanted the total width of the two-sided confidence interval on mean life to be six hours at 95% confidence. What sample size should be used? Round up the answer to the nearest integer.
= 25 hours. A random sample of 22 bulbs The life in hours of a 75-watt...
= 25 hours. A random sample of 22 bulbs The life in hours of a 75-watt light bulb is known to be normally distributed with has a mean life of K = 1014 hours. (a) Construct a 95% two-sided confidence interval on the mean life. Round your answers to the nearest integer (e.g. 9876). (b) Construct a 95% lower-confidence bound on the mean life. Compare the lower bound of this confidence interval with the one in part (a). Round your...
The quality control manager at a light bulb factory needs to estimate the mean life of...
The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 92 hours. A random sample of 64 light bulbs indicated a sample mean life of 360 hours. Complete parts (a) through (d) below. that the lightbulbs have a mean life of 410 hours. c. Must you assume that the population light bulb life is normally distributed? Explain. O A. Yes, the sample size is...
The life in hours of a 75-watt light bulb is known to be normally distributed with...
The life in hours of a 75-watt light bulb is known to be normally distributed with σ = 25 hours. Suppose that you wanted the total width of the two-sided confidence interval on the mean life to be six hours at 95% confidence. What sample size should be used?
Confidence Interval The quality-control manager at a light bulb factory needs to determine whether the mean...
Confidence Interval The quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of light bulbs is equal to 375 hours. The population standard deviation is 120 hours. A random sample of 64 light bulbs indicates a sample mean life of 350 hours. 1. At the 95% confidence level, what is the critical value? 39. What is the confidence interval based on this data? 2. Is there evidence that the mean life...
The mean life of a particular brand of light bulb is 1200 hours and the standard...
The mean life of a particular brand of light bulb is 1200 hours and the standard deviation is 75 hours. Tests show that the life of the bulb is approximately normally distributed. What is the range of hours that approximately 68% of the bulbs will last?
An electrical firm which manufactures a certain type of bulb wants to estimate its mean life....
An electrical firm which manufactures a certain type of bulb wants to estimate its mean life. The life of the light bulb is normally distributed with a standard deviation of 40 hours. A random sample of 36 bulbs resulted in a mean of 200 hours. a) (3 points) Construct a 92% confidence interval for the mean life of all light bulbs the firm manufactures. b) (4 points) How many bulbs should be tested so that we can be 92% confident...
An electrical firm which manufactures a certain type of bulb wants to estimate its mean life....
An electrical firm which manufactures a certain type of bulb wants to estimate its mean life. The life of the light bulb is normally distributed with a standard deviation of 40 hours. A random sample of 36 bulbs resulted in a mean of 200 hours. a) (3 points) Construct a 92% confidence interval for the mean life of all light bulbs the firm manufactures. b) (4 points) How many bulbs should be tested so that we can be 92% confident...
O CONFIDENCE INTERVALS AND HYPOTHESIS TESTING Confidence interval for the difference of population means: Use ......
O CONFIDENCE INTERVALS AND HYPOTHESIS TESTING Confidence interval for the difference of population means: Use ... A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 10 bulbs of model A showed a mean lifetime of 1240 hours and a standard deviation of 89 hours. Analysis of 14 bulbs of model B showed a mean lifetime of 1253...
The life in hours of a 75-watt light bulb is known to be normally distributed with = 23 hours. A random sample of 20 bulbs has a mean life of X= 1011 hours. Suppose that we wanted the margin of error in estimating the mean life from the two-sided confidence interval to be five hours at 95% confidence. What sample size should be used? Round up the answer to the nearest integer. Statistical Tables and Charts
= 25 hours. A random sample of 22 bulbs The life in hours of a 75-watt light bulb is known to be normally distributed with has a mean life of K = 1014 hours. (a) Construct a 95% two-sided confidence interval on the mean life. Round your answers to the nearest integer (e.g. 9876). (b) Construct a 95% lower-confidence bound on the mean life. Compare the lower bound of this confidence interval with the one in part (a). Round your...
The quality control manager at a light bulb factory needs to estimate the mean life of a large shipment of light bulbs. The standard deviation is 92 hours. A random sample of 64 light bulbs indicated a sample mean life of 360 hours. Complete parts (a) through (d) below. that the lightbulbs have a mean life of 410 hours. c. Must you assume that the population light bulb life is normally distributed? Explain. O A. Yes, the sample size is...
An electrical firm which manufactures a certain type of bulb wants to estimate its mean life. The life of the light bulb is normally distributed with a standard deviation of 40 hours. A random sample of 36 bulbs resulted in a mean of 200 hours. a) (3 points) Construct a 92% confidence interval for the mean life of all light bulbs the firm manufactures. b) (4 points) How many bulbs should be tested so that we can be 92% confident...
O CONFIDENCE INTERVALS AND HYPOTHESIS TESTING Confidence interval for the difference of population means: Use ... A light bulb manufacturer wants to compare the mean lifetimes of two of its light bulbs, model A and model B. Independent random samples of the two models were taken. Analysis of 10 bulbs of model A showed a mean lifetime of 1240 hours and a standard deviation of 89 hours. Analysis of 14 bulbs of model B showed a mean lifetime of 1253...
Most questions answered within 3 hours.
-
Why do men earn more money than women in America?
asked 1 minute from now -
Sales of tablet computers at Ted Glickman's electronics store
in Washington, D.C., over the past 10...
asked 9 minutes ago -
Short essay question:
First, discuss the anatomical differences between Paleocene
pro-primates and Eocene eu-primates and explain...
asked 8 minutes ago -
Suppose we have a binomial experiment in which success is
defined to be a particular quality...
asked 30 minutes ago -
march the type of cellular control with the description: enzyme
induction and the enzyme repression. How...
asked 40 minutes ago -
Brief Exercise 5-09 (Part Level Submission)
The following information relates to Blue Spruce Corp. for the...
asked 40 minutes ago -
An unknown amount of a compound with a molecular mass of 284.04
g/mol is dissolved in...
asked 45 minutes ago -
You are at rest at a stop sign. There is another stop sign that
is 100...
asked 46 minutes ago -
Calculate the equilibrium electrode potential for Fe3+/Fe2+
redox system, if the initial concentration of Fe2+ is...
asked 50 minutes ago -
Describe in detail with graph and diagram how bonding force,
bonding curves and bonding energy at...
asked 1 hour ago -
Gingerbread cookies become inedible if not eaten quickly enough.
Clarence is trying to determine how many...
asked 1 hour ago -
A
crane lifts a 200 kg block a height of 10 m in 18 seconds. What...
asked 1 hour ago