Confidence interval for mean all time for all timeport

Reference no: EM13128599

Talk Time on a Cell Phone Suppose Motorola wishes to estimate the mean "talk time" for its Timeport P8160 digital phone before the battery must be recharged. In a random sample of 40 phones, the sample mean talk time was 315 minutes with a standard deviation of 24 minutes.

(a) Why can we say that the sampling distribution of x is approximately normal?

(b) Construct a 94% confidence interval for the mean "talk time" for all Timeport P8160 digital phones.

Reference no: EM13128599

Questions Cloud

Social functions : Discuss the social functions/dysfunctions of deviance. Based on numerous theories, can society ever be free of deviance? Why or why not?

What is the molecular weight of the unknown : A 5.50 g sample of an unknown is dissolved in 251. g of benzene. The freezing point of the solution is 1.02 C below the normal freezing point of pure benzene.

Why is depreciation for income tax purposes an important : Why is depreciation for income tax purposes an important concern of taxpayers and how does tax depreciation differ from financial accounting depreciation?

What are corporate dividends : What are corporate dividends and how are they distributed and accounted for? Provide a discussion of all potential scenarios and the relevant accounting requirements.

Confidence interval for mean all time for all timeport : The sample mean talk time was 315 minutes with a standard deviation of 24 minutes. Why can we say that the sampling distribution of x is approximately normal?

What will be the equilibrium output for the industry : What will be the equilibrium price? What will be the equilibrium output for the industry? For each firm? What will profit or loss be per unit? Per firm? Will this industry expand or contract in the long run?

How can firms use transfer prices strategically : What role does GAAP play in how firms determine transfer prices?

Standard theorems on trigonometric limits : Using the definition of the derivative and any standard limiting theorems, show that the derivative of (sinx)^2 is sin(2x).

The fictional critique on art critique : read the fictional critique below. Then answer the subsequent questions. Art Critique

User Account

All Pages