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The length of pregnancies are normally distributed with a mean of 268 days and standard deviation of 15 days. How many days do 80 percent of women last until in their birthing process?
Probability based on binomial distribution - evaluate the probability of x successes in the n independent trials of the experiment.
In a study of 24 criminals convicted of antitrust offenses, the average age was 55 years, with a standard deviation of 7.6 years. Construct a 98% confidence interval of the true mean age.
What is the probability the number of fatal crashes will be between 1000 and 2000 for a year?
A production process manufactures items with weights that are normally distributed with mean 16 pounds and standard deviation 0.15 pound. An item is considered to be defective if its weight is less than 15.8 pounds or greater than 16.2 pounds.
Capital punishment law is among the most complex bodies of law in the US. As a result of frequent errors, the Trial Judges Assn. has developed a special training course to try to cut down on the errors.
They select every 20th person from the list until a sample of 100 is obtained. They then call these 100 people. Does this sampling plan result in a random sample? Simple random sample? Explain.
A multiple regression analysis includes 25 data points and 4 independent variables results in SST = 200 and SSR = 150. the multiple standard error of estimate will be?
From a random sample we know that the average duration of unemployment in a low developed region A is 147 days (with standard deviation sA = 32 days and nA = 230 unemployed).
Construct a 95% confidence interval estimate for the population proportion of administrative professionals who prefer cash bonuses.
When we move from the basic normal distribution to the sampling distribution of the mean we substitute the standard error of the mean for the standard deviation when we make the conversion to the standardized normal distribution.
Assume that the distribution of heights of adults American normally distributed, with mean 69 inches and standard deviation 2.8 inches.
Individual loss amounts (ground up) this year follow an inverse Weibull distribution with τ= 3 and expected value 1000. Next year you con?fidently expect loss amounts to in?ate by 10% uniformly across the board.
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