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Macaray Homes is developing two parcels near Globe Arizona. In order to test different advertising approaches, they use different media to reach potential buyers. The mean annual family income for 75 people making inquiries at the first development is $150,000, with a standard deviation of $40,000. A corresponding sample of 120 people at the second development had a mean of $180,000, with a standard deviation of $30,000. At the .05 significance level, can Macaray conclude that the population means are different? Note that you should show all 5 steps in the test of hypothesis.
A comparison group consisted of 5,055 children who had received no such treatment (brothers and sisters of the children who had received radiation treatment).
Based on the Correlation following are Multiple choices question. If the correlation coefficient among two variables is equal to zero, what can be said of the variables X and Y.
For 1989 and 1990 Dave Johnson had the highest decathlon score in the world. When Johnson reached a speed of 32 ft/sec on the pole vault runway, his height above the ground t seconds after leaving the ground was given by h= -16t^2+32t.
Construct a 95 percent confidence interval for the true mean.
use two sums from part A and the computational formal to compute sum of square (SS)for the scores.
What is the difference between the R and R-squared terms? What does each tell you? How large should the R-squared term be if you want to show that the two variables are practically related?
Assume a sample of 25 women is needed for the study. What type/s of method/s of random selection can you use to determine which women should be asked to participate in the study?
You use it to call 250 randomly chosen residential telephones in Florida. Of the registered voters contacted, 33% are registered Democrats. Is each of the boldface numbers a parameter or a statistic?
Computing the Z scores for the given data and evaluate µ and σ for the population.
The average could be a poor estimate of the spending of all teenagers given that only teenagers in malls were sampled.
If we assume all the possible random samples of 250 students at this university, 95 percent of the samples should have means among what two numbers.
Compute the difference scores for following data from repeated-measures study.
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