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20 pts Do singers of di erent voice parts have di erent heights? The observations were made in 1979 on heights in inches of male singers of the NY Choral Society. MTB oneway c1 c2; SUBC tukey. What test has been performed here? What are the hypotheses H0 and H1 ? What are general assumptions necessary for the above procedure to be valid. What is your decision about H0 and H1 at = 0:05? Give the orderings of the population means according to the tukey procedure. Is H0 : 2 = 4 a contrast?
At a 5% level of significance, is there sufficient evidence that the population mean waiting time is now less than 3.7 minutes?
Rodney partida is an American who is of Mexican ancestry. He was convicted of burglary with intent to commit rape. Use the "rule of thumb" to find the minimum usual number and the maximum usual number of Mexican-americans.
The director of admissions at a large university advises parents of incoming students about the cost of textbooks during a typical semester.
Standard deviation is 35 hours. Is the company making acceptable light bulbs? Assume life spans are normally distributed.
Use factoring, the quadratic formula, or identities to solve the following equations:
Assuming that the goal of 4% undersized tomatoes is reached, what is the probability of getting no more than 1 undersized tomato in a randomly selected sample of 20 tomatoes?
The true proportion of all current B of A customers who would respond with a 9 or 10. Are we 95 % confident that this proportion exceeds .48 the historical proportion of customer delight for B of A?
The data consists of random sample of 30 households from the 2007 American Community Survey. Construct a frequency distribution and a histogram for each data set.
Find the 95 percent confidence interval for the mean score on each exam. Do the confidence intervals overlap? If so, what does this suggest?
Results show access to health care was increased at p
You obtain the data shown below for 30 girls with anorexia who were treated with psychodynamic therapy. Using the data below and the data above compare the outcomes for CBT and psychodynamic therapy.
Using P-values for hypothesis testing they are intuitively easy and dont require critical values in charts. In real world terms, what is the best way to describe how P-values work and how to explain this to someone?
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