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A group of biologists wants to estimate the abundance of barrel cactus in a desert. They divide the desert into a grid of 100 rectangular areas but exclude 10 of those areas because they are difficult to access. The biologists then measure the density of cactus in a randomly selected sample of 40 of the 90 accessible areas.
a. What was the sampling frame in this study, and how did it differ from the population of interest?
b. Explain why the problem called "using the wrong sampling frame" might lead to a biased estimate of the abundance of cactus in the desert.
The overall results on the French exam had a mean of 72 and a standard deviation of 8, while the mean math score was 68, with a standard deviation of 12. On which exam did she do better compared with the other freshmen?
Refer to the previous two exercises. PROC GENMOD in SAS reports the maximized log likelihood as 3475.19 for the model of mutual independence (df = 11), 3538.05 for the model of homogeneous association (df = 5), and 3539.58 for the model containing..
A random sample from a normal population yields the following 25 values: 90 87 121 96 106 107 89 107 83 92
Depict the situation as a model with incomplete information, where the state of nature is the amounts in Mark and Luke's envelopes.
A and B throw with one die for a prize of Rs199 which is to be won by the player who first throws 6. If A has the first throw their respective expectation are
In samples of mortgages of size 75, what proportion of the samples would you expect to produce sample proportions equal to or larger than 0.25?
question 1 the mean starting salary for college stats major graduates in spring of 2011 was 65000. assuming a normal
What is the mean and standard deviation of the flow time? What is the probability that the total time will be less than 920 seconds?
Is there evidence that teams with higher total payrolls tend to be more successful? Justify your answer.
Use the 0.05 level in concluding whether each partial regression coefficient differs significantly from zero.- Construct a 95% confidence interval for each partial regression coefficient in the population regression equation.
question 1in a certain region the mean annual salary for plumbers is 51000. letnbspxnbspbe a random variable that
1. a multiple regression line was calculated in which x1 was a students grade point average and x2 was a students age.
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