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Researchers have developed a filament that should add to the life expectancy of light bulbs. A sample of n=100 bulbs is prepared using the new filament. The average life for this sample is x¯ = 780 hours with σ =15.
a. Use the sample data to make a point estimate of the mean life expectancy for the new filament.
b. Make an interval estimate so that you are 80% confident that the true mean is in your interval.
c. Make an interval estimate so that you are 99% confident that the true mean is in your interval.
if we were randomly drawing a sample of one organizaiton from a population of 15 where five are high performers and
Describe the event you intend on watching and provide the website link. Include the key speakers of the event/panel in your description.
the local municipality claims that since the percentage of intersections that had an accident last year decreased from
A cabinet has four drawers. Two of the drawers each contain two envelopes, each containing $10, one drawer contains one envelope with $5 and one envelope.
a couple is getting married on june 20th at an outdoor ceremony. in recent years it has rained only 5 days in june.
How does sample size affect the interpretation of survey results?- Distinguish between haphazard and quota sampling.
what other factors influence an individual to choose one job over another and What jobs do you think have the best mix of salary and other characteristics
a new analytical method to detect pollutants in water is being tested. this new method of chemical analysis is
Draw the standard normal distribution, label the axis, locate both z-scores on the axis (z7 = -1.5, z15 = 2.5), and shade an area equal to the probability that a randomly chosen croaker fish will be b/t 7 and 15 inches.
Compute the effect size with gender as the grouping variable and ADDSC as the dependent variable.
Write null and alternative hypotheses about the relationship between the two variables in this situation. Make your hypothesis statements specific to this situation.
A random sample of 56 fluorescent light bubs has a mean life of 645 hours with a standard deviation of 31 hours.
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