Q1) The lifetime of electric bulbs for a random
sample of 10 from a large consignment gave
following
the
data
Can we accept
accept the hypothesis that the
average life of 영
bulbs 4,000 hours?
time
Answers
Answer:
)The life time of electric bulbs for a random sample of 10 from a large consignment gave the following data: 4.2, 4.6, 3.9, 4.1, 5.2, 3.8, 3.9, 4.3, 4.4, 5.6 (in 000 hours). Can we accept the hypothesis that the average life time of bulbs is 4, 000 hours.
B)The manufacturer of a certain make of electric bulbs claims that his bulbs have a mean life of 25 months with a standard deviation of 5 months. Random samples of 6 such bulbs have the following values: Life of bulbs in months: 24, 20, 30, 20, 20, and 18. Can you regard the producer’s claim to valid at 1% level of significance.
Answer:
This problem is solved by using R Output : Problem 1: Here we are interested in the following null and alternative Hypothesis : HO := 4 (in 000 hours) Ha:4 (in 000 hours)