The quality-control manager at a light bulb factory needs

Assignment Help Basic Statistics

Reference no: EM13623743

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 385 hours. The population standard deviation is 84 hours. A random sample of 49 light bulbs indicates a sample mean life of 367 hours.

A: at the 0.05 level of significance, is there evidence that the mean life is different from 385 hours?

B: Compute the p-value and interpret its meaning

C: Construct a 95% confidence interval estimate of the population mean life of light bulbs

D: Compare results of (a) and (c). What conclusions do you reach?

a) no meaningful conclusions can be reached

b) the results of (a) and (c) are no the same

c) the results of (a) and (c) are the same

Reference no: EM13623743

Questions Cloud

Suppose that the probability that a person between the ages : suppose that the probability that a person between the ages of 19 and 24 checks their daily horoscope is 0.12. if 400

For a hypothetical magazine the probability that the reader : for a hypothetical magazine the probability that the reader is male given that the reader is at least 35 years old is

Is the number of visits significantly less for the dog : siegal found that elderly people who owned dogs were less likely to visit the doctor after upsetting events than were

A previous study indicates that the percentage of chain : a previous study indicates that the percentage of chain smokers p who have lung cancer follows a beta distribution with

The quality-control manager at a light bulb factory needs : the quality-control manager at a light bulb factory needs to determine whether the mean life of a large shipment of

Now suppose the incidence of the disease in another : a test for a certain disease is found to be 96 accurate meaning that it will correctly diagnose the disease in 96 out

A machine produces ball bearings is set so that the average : a machine produces ball bearings is set so that the average diameter is .50 inch. a sample of 10 ball bearings was

The equation of the estimated regression line that relates : to determine whether the cash bonus paid by a company is related to annual pay data were gathered for 10 account

The null and alternate hypotheses is h micro 20 h micro : a random and indepently chosen sample of four bags of marbles each labeled 20 pounds had weights of 20.5 19.8 20.8 and

User Account

All Pages