Find out a confidence interval for the true mean lifetime

Assignment Help Business Management

Reference no: EM13108869

Q. The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 52 hours. Assume that a random sample of 90 bulbs of this brand has a mean lifetime of 494 hours. Find out a 90% confidence interval for the true mean lifetime of all light bulbs of this brand. Then complete the table below.

Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.

Reference no: EM13108869

Questions Cloud

Explaining whether the renovation should occur : clearly labels the pre and post renovation analysis using an Excel work sheet. Do a comparative analysis in a Word document not to exceed 200 words explaining whether the renovation should occur.

Estimate the break even point : A manager must decide how many machines of a certain type to purchase. Each machine can process 100 customers per day. One machine will result in a fixed cost of $2000 per day.

Alternative hypothesis for a null hypothesis : What is the alternative hypothesis for a null hypothesis stating that the average time a person keeps a cell phone is, at most, three years?

How many grams of mgso4 would you need : If you wanted to make a 0.5M solution of MgSO4, how many grams of MgSO4 would you need? Assume the volume of the solution is one liter. Show your work.

Find out a confidence interval for the true mean lifetime : Find out a 90% confidence interval for the true mean lifetime of all light bulbs of this brand. Then complete the table below. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.

Determine the molar mass of the nonelectrolyte : Determine the molar mass of the nonelectrolyte if the osmotic pressure of the solution = 23.6 atm, also express your answerin g/mol?

Hypothesis testing using samples : A study by Hewitt Associates showed that 79% of companies offer employees flexible scheduling. Suppose a researcher believes that in accounting firms this figure is lower.

Explain the black x pink tail and black x black crosses : In rats, a black-tailed mutant was discovered. When it was crossed to a pink long-tailed rat, 4 offspring were black-tailed and 3 were pink tailed. Two of these black-tailed rats were crossed and they produce 6 black tailed and 3 pink-tailed rats.

Determine the new volume of balloon : Determine the new volume of a 1.3 L balloon if it is taken from room temperature that is twenty five degree celsius and placed into a freezer at the temperature of -11.5 degree celsius.?

User Account

All Pages