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1. Still assuming equal variances, test the hypothesis of equal means using Student's t-test and the data in the last problem. Use α = .05.
2. Comparing the results for the last two problems, what do they suggest regarding the power of Welch's test versus Student's t-test when the sample variances differ sufficiently.
you are a real estate agent and you are trying to predict home prices for your clients that want to list their house
How long do new batteries last on a camping trip? A random sample of n1 = 42 small camp flashlights were installed with brand I batteries and left on until the batteries failed.
Given the following values of central tendency for each distribution, determine whether the distribution is symmetrical, positively skewed, or negatively skewed:
suppose x has density function 3x-4 for x is greater than or equal to 1.a find a function g so that gx is uniform on
The receiver is correct only 85% of the time. What is P(W), the probability of a wrong decision if the probabilities of receiving 0s and 1s are equally likely? What can you conclude from your result?
The gas price index for 1985 was 218.5 and the gas price index for 2000 was 276.8. If it cost $18.13 to fill your gas tank in 1985, how much would it have cost to fill the same tank in 2000?
The answers are not provided properly for b to f Use Excel to Answer the Following Questions The price of a share of stock divided by the company's estimated future earnings per share is called the P/E ratio. High P/E ratios usually indicate "grow..
we know that one way to characterize data is as either a parameter or a statistic. there is another way that data is
If a garage is robbed, what is the probability the doors were left open?
consider two independent random variables xsub1 and xsub2 having same cauchy distributionfx1pi1x2 from negative
Transparency and Stock Trading Activity Explain the relationship between transparency of firms and investor participation (or trading activity) among stock markets. Based on this relationship, how can governments of countries increase the amount o..
Consider repair costs for Car A and Car B. The mean repair cost for each is $500 per year. Which statistics about repair costs may play into your decision to purchase one of these cars? Which car would you choose? Explain.
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