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Find the expression for velocity profile, the mass flow and heat transfer rates of air due to natural convection in a vertical channel of circular and square cross-section for the fully developed flow. The walls are kept at temperature Tw= 30 C and the channel has the height of H=3 m.. The walls are separated by a distance of t=10 cm in the square channel case or the channel has diameter of d=10 cm in the circular-cross section case. The air enters the duct between walls at T =10 C
Describe the chi-square test of independence. How is this test different from the chi-square goodness-of-fit test? Are the assumptions underlying each of these tests the same?
Describe the data for a correlational research study. Explain how correlational research is different from other research evaluating the relationship between two variables.
Generate a 95% confidence interval for the true mean total cholesterol levels in children.
In a regression model involving 30 observations, the following estimated regression equation was obtained:
Over the interval 9.5 to 12.5 gallons per minute. Find the probability that between 10.0 gallons and 11.0 gallons are pumped during a randomly selected minute.
Different populations yield the following data. 1 = 236, 2 = 905, = 88 = 13 The sample size is 381 for both samples. Find the 85% confidence interval?
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.
Develop three regression models to predict the selling price based upon each of the other factors individually. Which of these is best?
Using the given data set, find (a) the sample mean, (b) the sample standard deviation, (c) construct a 98% confidence interval for the population mean μ.
The average gasoline price of one of the major oil companies in Europe has been $1.25 per liter. Recently, the company has undertaken several efficiency measures in order to reduce prices.
Test to determine whether the correlation in the population is zero, versus the alternate hypothesis that the correlation is greater than zero. Use the 0.05 significance level.
A population whose shape is unknown has a median of 75. You selected a sample of 40. The standard deviation of the median is 5. Calculate the probability that the median of the sample or average medians is:
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