Test comparing two means with variances
In a left-ailed test comparing two means with variances unknown but assumed to be equal, the sample sizes were n1 = 8 and n2 = 12. At Î± = .05, the critical value would be:
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The number of beetles in a lawn varies with an average of 1.3 square yard. What is the approximate probability of obtaining a sample of a square yard of lawn with at most one beetle?
Customers come to a barber shop with the frequency of 3 per hour. Suppose Y4 is the time when the 4th customer has come. Find the expected value and the standard deviation.
Find the 80th percentile of the pecan tree height distribution. If a random sample of 64 pecan trees is selected, what is the standard deviation of the sample mean?
An experiment was designed to estimate the mean difference in weight gain for pigs fed ration A as compared with those fed ration B. Eight pairs of pigs were used. The pigs within each pair were litter-mates.
Test the slope of the regression line for the following data. Use alpha equals .01
What is the value of the coefficient of determination for this regression model? Comment on the strength of the regression line for this model.
The amount of overlap is normally distributed with a mean of 1 inch and a standard deviation of 0.2 inches. Assuming the lengths and the amount of overlap are independent of each other, what is the probability that the total length after insertion
Suppose IQ scores were obtained from randomly selected couples. For 20 such pairs of people, the linear correlation coefficient is 0.896 and the equation of the regression line is y^=6.22 + 0.95x, where x represents the IQ score of the wife.
Calculate the p-value and draw conclusions to determine if sales have increased since the new store opened. Use significance level of .01.
A pump is used to raise the pressure of water from 0 psig to 55 psia. How much power (in kW) will be required to pump 1.5ft3/s of water? What is the effect of the water temperature on the pump power that is required?
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