8.8. A manufacturing company of light bulb claims that an
average light bulb lasts 500 days. A contractor randomly selects 30
bulbs for testing. The sampled bulbs last an average of 490 days,
with a standard deviation of 100 days. If the claim were true, what
is the probability that 30 randomly selected bulbs would have an
average life of no more than 490 days? [10]
Shoes Company Strategy: The strategy should include type of
strategy to pursue, vision, mission, and objectives (how you will
implement your strategy).
Shoes Company Strategy: The strategy should include type of
strategy to pursue, vision, mission, and objectives (how you will
implement your strategy).
(b) A light
bulb manufacturer requires no more than 10% defective light bulbs
if the manufacturing process is to be considered working.
Assuming the manufacturing process is producing only 10%
defectives, what is the probability that a sample of 20 randomly
selected light bulbs will contain exactly 2 defective
light bulbs?
Suppose the reliability of the manufacturing process is
unknown. In a random sample of 10 light bulbs 5 defectives
are found. Based on this result, the manufacturer wants to...
A light-bulb manufacturer advertises that the average life for
its light bulbs is 900 hours.
A random sample of 15 of its light bulbs resulted in the
following lives in hours.
995
590 510 539 739 917 571 555
916 728
664 693 708 887
849
At the 10% significance level, test the claim that the sample is
from a population with a
mean life of 900 hours. Use the P-value method of testing
hypotheses. Identify the null and alternative hypotheses,...
3a. What happens if we remove a light bulb from the circuit
having Light Bulbs in Series:
3a. What happens if we remove a light bulb from the circuit
having Light Bulbs in Parallel:
3c. Christmas lights sometimes come wired in parallel or in
series. Which variety do you prefer and state why?