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A certain commodity is known to have a price that is stable through time and does not change according to any known trend. Price, however, does change from day to day in a random fashion.
If the price is at a certain level one day, it is as likely to be at any level the next day within some probability bounds approximately given by a normal distribution. The mean daily price is believed to be $14.25.
To test the hypothesis that the average price is $14.25 versus the alternative hypothesis that it is not $14.25, a random sample of 16 daily prices is collected. The results are x‾ = $16.50 and s = $5.8. Using α = 0.05, can you reject the null hypothesis?
a college believes that 24 of applicants to that school have parents who have remarried. how large a sample is needed
If 49 participants (49 = size of the sample) are chosen randomly, what is the probabilty that their mean spent amount will be in $6 of population mean? (mean+/-6).
a biologist has found that 40 of all brown bears are infected with trichinosis. 10 brown bears are tested for
Refer to the simple linear regression of number of employees y and age x for fast-growing firms, Exercises 9.21,9.29, and 9.41. The SAS printout of the analysis is reproduced on page 526.
the probability of two or more events occurring concurrently is called aa conditional probability.b empirical
He argues that the regression effort says people who perform very poorly in their previous job tend to perform well in their next job. Is this what the regression effect says? Explain.
Using the appropriate formula for grouped data, calculate the mean number of hours in downtime. Using the appropriate formulas for grouped data, calculate the variance and the standard deviation.
Construct a 95% confidence interval for the proportion of red candies. Using your same data determine if the proportion of green candies in a package of M&Ms is differen than what is claimed by the company.
assume that you must conduct a new poll to determine the percentage of adults who believe that it is morally wrong to
predicting winning percentage for the nflthe national football league nfl records a variety of performance data for
What sample size should be chosen so that there is 0.95 probability of estimating the mean monthly income in $150 or less?
a scientist testifying before a congressional hearing on the effects of estrogenic pesticides told every man in the
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