Hypothesis testing mean lifetime of light bulbs

Reference no: EM13110317

A manufacturer claims that the mean lifetime of its light bulbs is 55 months. The standard deviation of these lifetimes is 6 months. Twenty-two bulbs are selected at random, and their mean lifetime is found to be 56 months. Assume that the population is normally distributed. Can we conclude, at the 0.05 level of significance, that the mean lifetime of light bulbs made by this manufacturer differs from 55 months?

Perform a two-tailed test. Then fill in the table below.

Carry your intermediate computations to at least three decimal places, and round your responses as specified in the table. (If necessary, consult a list of formulas.)

Please answer:

Ho=

H1=

Type of test?

The values of the test statistic?

The two critical values at the 0.05 level of significance?

Can we conclude that the mean lifetime of light bulbs made here differs from 55 months?

Reference no: EM13110317

Questions Cloud

Remission time-depressed individuals : Medical researchers interested in determining the relative effectiveness of two different drug treatments on people with a chronic mental illness established two independent test groups.

Importance of strategic plan for success of defined business : Develop an argument supporting the importance of a strategic plan for the success of the defined business.

How many days will it take to become a palpable mass : Apply the principle of exponential growth to the cells in a multicellular organism where a cancer arises in a lymph node. Assume the tumor cells double every 18 hours and none die. How many days will it take to become a palpable mass (approximatel..

Why antibioticresistant bacteria donot demonstrate evolution : Explain why examples such as the peppered moth, pesticide-resistant insects, and antibiotic-resistant bacteria do not demonstrate evolution.

Hypothesis testing mean lifetime of light bulbs : A manufacturer claims that the mean lifetime of its light bulbs is 55 months. The standard deviation of these lifetimes is 6 months. Twenty-two bulbs are selected at random, and their mean lifetime is found to be 56 months.

Hypothesis testing-one-tailed test : A rental agent claims that the mean monthly rent,u, for apartments on the east side of town is less than$725 . A random sample of 13 monthly rents for apartments on the east side has a mean of$714

Calculate the expected inventory turnover : The owner of Genuine Reproductions (GR), a company that manufactures reproduction furniture, is interested in measuring inventory effectiveness.

What is the phenotype of the original parents : A fly with curly wings is mated with a fly that has straight wings. The curly-winged fly lays 350 eggs that hatch, make larvae, then pupae, then adult flies.

Write objective coefficient ranges for three components : Write down the objective coefficient ranges for three components? Interpret these ranges for company management.

User Account

All Pages