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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.
We will examine the association between the weight of the car (in thousand of pounds) and the fuel efficiency (in miles per gallon). Shown is the regression output.
question a sample of 65 observations is selected from one population with a population standard deviation of 0.75.
A gambler knows that red and black are equally likely to occur on each spin of a roulette wheel. He observes five consecutive reds occur and bets heavily.
Although he expects the two ends to weigh the same, they might differ slightly. What's the probability the difference is more than a quarter of a pound?
question assume that a procedure yields a binomial distribution with n trials and the probability of success for one
While it can't be denied that advertising impacts sales, it is also true that advertising is expensive and companies want to advertise in ways that have the greatest benefit for the amount of money spent.
A large number of digits are reported for the means and the standard deviations. Do you think that all these digits are necessary? Give reasons for your answer and describe how you would report these results.
Calculate mean and SS for sample of difference scores.
1. * Give an example of a density function on Œ0; 1] by giving a formula such that the density is finite at zero, unbounded at one, has a unique minimum in the open interval .0; 1/, and such that the median is .5.
What are the advantages of ANOVA over the mean test and what are the disadvantages? Where would I use this in my everyday life?
Complete this exercise by hand. A famous brand-name manufacturer wants to know whether people prefer Nibbles or Wribbles. They sample each type of cracker and indicate their like or dislike on a scale from 1 to 10. Which do they like the most?
Dice. The seller of a loaded die claims that it will favor the outcome 6. We don't believe that claim, and roll the die 200 times to test an appropriate.
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