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Computing probability values using normal distribution.
A sample of 500 evening students revealed that their annual incomes from employment in industry during the day were normally distributed with a mean income of $30,000 and a standard deviation of $3,000.
How many students earned more than $36,000? _______
Systolic blood pressures are measured at baseline and again 4 weeks later. Compute a 95% confidence interval for the mean difference in blood pressure over 4 weeks.
Fresh fruit prices and quantity data for years 1988 to 2001 follow (Statistical Abstract of United States, 2002). Quantity data reflect per capita consumption in pounds and prices are per pound.
Design a Linear programming problem for the flair Furniture Company and find the combination of tables and chairs that the company must produce to maximize profits.
The evidence supports the manufactuer claim at the .05 significance level. Suppose 49 bulbs were tested with the folowing results: x-bar = 827.5 hours, s= 70 hours. Conduct the test using alpha=.05.
The Central Limit Theorem states that the sampling distribution of means is:
Determine what analysis would you do on each problem (i.e., one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
For a binomial probability experiment, with n=150 and p=.2, it is appropriate to use the normal approximation to the binomial distribution.
The McCollough Corporation, a producer of various kinds of batteries, has been producing D size batteries with a life expectancy of 87 hours.
The standard deviation of the ages of a sample of 21 executives from the northern states was 8.4 years; while the standard deviation of the ages of a sample of 30 executives from southern states was 12.8 years.
Task is exponentially distributed with a mean of 8 minutes. What is the probability that it will take a worker less than 4 minutes to complete the task (to 4 decimals)?
1.a researcher wishes to compare the effect of two stepping heights low and high on heartrate in a step-aerobics
Multiple choices based on regression analysis - the percentage of variation in the dependent variable explained by the variation in the independent variable
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