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For a sample of 41 New England cities, a sociologist studies the crime rate in each city (crimes per 100,000 residents) as a function of its poverty rate (in %) and its median income (in $1,000s). A portion of the regression results are shown.
a. Calculate the standard error of the estimate. Given that the mean crime rate for this sample is 597, calculate and interpret Se/
b. What proportion of the variability in crime rate is explained by the variability in the explanatory variables? What proportion is unexplained?
In problem, what is the probability of observing a value greater than or equal to 3?
Only two doctors would make a diagnosis on patients coming into the same STD clinic for gonorrhea. The probability of the two doctors making a diagnosis of gonorrhea is (independent, dependent, synergistic, cannot tell).
A survey of licensed drivers inquired about running red lights. One question asked, "Of every ten motorists who run a red light, about how many do you think will be caught?"
1. What is the estimated standard error for a sample of n = 25 scores with SD = 60?
A hospital has decided to replace an important piece of medical equipment at a cost of £30 000. The expected life of the equipment is five years.
Assume the distribution of amounts purchased follows the normal distribution. For a sample of 50 customers, answer the following questions. What is the likelihood the sample mean is at least $25.00?
Suppose the number of nonconformances in the engine and transmission are recorded separately for each car.
Develop a scatter diagram with price as the independent variable and what does the scatter diagram developed in part (a) indicate about the relationship between the two variables?
After your merge with another survivor group, you notice that a social hierarchy is emerging in this new group. How would you advise your group? Is a hierarchy beneficial? Does this help or harm your group in this new world?
A researcher is interested in studying the use of antibacterial products and the dryness of people's skin. He thinks these products might alter the moisture.
If during the busiest periods of the day requests for electronic transfers arrive at the rate of 170 per 10-minute period on average.
The standard error of the estimate can be used to determine a range within which the independent X variables can be predicted with varying degrees of statistical confidence based on the regression coefficients and the value for the Y variable.
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