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In the banking industry, the return on equity ratio or percentage is used to evaluate the financial performance of a bank. Such information is extremely valuable to investors. Calculate the return on equity (ROE) for a sample of 20 banks for the year before the Sarbanes-Oxley Act was enacted. For the same sample of banks, calculate the ROE for the year following the enactment of the Sarbanes-Oxley Act. Later, answer the following questions: • After the enactment of the Sarbanes-Oxley Act, was the average bank's ROE lower than it was before the act? If so, why do you think that was the case?
• What is the null hypothesis for this hypothesis test?
• What is the alternative hypothesis for this hypothesis test?
• Choose at least three different significant levels to conduct the hypothesis test. Is it possible that a Type I error occurred with the hypothesis test? Why or why not?
• Is it possible that a Type II error occurred? Why or why not?
a student takes a 20-question multiple choice exam and guesses on each question. each question has 4 choices only one
question which is relatively better a score of 85 on a psychology test or a score of 45 on an economics test? scores on
At a 0.05 level of significance, determine if there is a significant difference in the mean weekly units of production for the three types of work schedules (perform all six steps of hypothesis testing and show the ANOVA table).
In communication systems, the error probability P[E] may be difficult to calculate; however it may be easy to derive an upper bound of the form P[E] ≤ . In this case, we may still want to estimate P[E] using the relative frequency n(E) of E in n t..
Consider the AR(2) model: (B)Xt = Zt where (z) = 1 1z 2z2 and fZtg is white noise. Show that there exists a unique causal stationary solution if and only if the pair (1; 2) satises all of the following three inequalities:
National data show that, on average, college freshman spend 7.5 hours a week going to parties. President DeRosa doesn't believe that these figures apply at his school; he thinks freshman at his school party less.
If he were to randomly select 120 corks from the next box, then how many of these corks would John expect to be undersized?
according to a recent survey the average urban person consumes 1.5 kg of food per day. is this figure accurate for
question a pharmaceutical company manufactures large batches of analgesic caplets which are designated to contain 200
calculate the mean and variance for each portfolio's returns
children gender. a certain couple is equally likely to have either a boy child or a girl child. if the family has four
More precipitation for May is 12. Question: What is the probability that Rapid City has 18 days with .01 inch or more precipitation next May?
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