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Suppose that a researcher does a study to see how level of anxiety (A1 = low, A2 = medium, A3 = high) is used to predict exam performance (Y).
Set up orthogonal coded dummy variables (O1, O2) to represent linear and quadratic trend, and run a regression analysis to predict exam scores from O1 and O2. What conclusions can you draw about the nature of the relationship between anxiety and exam performance?
Let p represent the proportion of registered voters in the state that would vote for the Republican candidate. The standard error for the proportion of those who phoned in who answered "yes" is
If a group is chosen from a population on the basis of sharing the same percentages of trait features as known to exist in the population, then the group so chosen would constitute:
What is the probability of selecting an accounting major, given that the person selected is a male?
Gigi has rolled a natural on four straight tosses of the dice. This excites the gamblers standing around the table.
Let X be the number of yes votes obtained from a random sample of 200 out of the entire voting population. What is the expected value of X if, in fact, 65% of all voters supported the dictator?
Perform a chi-square test on the following data:
The mean of a sample is 22.5. The mean of 1000 bootstrapped samples is 22.491. The bias of the bootstrap mean is
A simple random sample of 1000 Americans found that 61% were satisfied with the service provided by the dealer from which they bought their car.
If the standard deviation is $89.46, find the probability that a randomly selected customer spends between $550.67 and $836.94.
For this same sample of n = 45, find out the width of confidence interval around population mean? Illustrate all work.
Determine the coefficient of correlation between the two variables. Interpret the value.
What is the OR of getting cancer fora late child birth woman compared to an early first birth woman?
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