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A random sample of 36 radio stations is selected in order to estimate the avaerage charge for the same fixed-length spot announcement. The sample mean and standard deviation are $20.00 and $8, respectively. Assume that the charges made by all radio stations of the type sampled are approximately normally distributed. Construct the 95% confidence interval for the population mean.
for women age 25-34 with full-time jobs the average income in 2004 was 32000 and the sd for income was 26000. assuming
Calculate a four-quarter weighted moving average for the number of America Online (AOL) subscribers for the nine quarters of data. The data are reported in thousands.
Suppose that among workers exposed to asbestos in a shipyard in 1980, 33 died over a 10 year period from COPD, whereas only 24 such deaths would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excess..
Is there a significant difference in sales dollars of hats between the west side and east side stores at the 5 percent level of significance? (a) State the hypotheses. (b) State the decision rule and sketch it. (c) Find the test statistic and stat..
In 2002 the Supreme Court ruled that schools could require random drug tests of students participating in competitive after-school activities such as athletics.
assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of 2225
let a be the set of english words that contain the letter x and let b be the set of english words that contain the
Is this hardware retailer's sales significantly different from all retailers in the chain at p= .05? Are they significantly different at p= .01? Calculate a .95 confidence interval for the data in problem.
A table showing the season in which the first 36 U.S. presidents died. Research question: At alpha=0.10, Can you reject the hypothesis that presidents' deaths are uniformly distributed by season?
Suggests a survey of area restaurants to see if the situation is pervasive. What do you think of this research suggestion? How could you improve on your boss's formulation of the research question?
How many questions must the test contain in order to reduce the standard deviation of Julie's proportion of correct answers to one-fourth its value for an 100-item test?
a normal population has m 50 and s 8. a random sample of n 4 scores from this population has a mean of 54. what is
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