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Question: Consider annual salary as the Y variable and age as the X variable.
a. Draw a scatterplot and describe the relationship.
b. Find the correlation coefficient. What does it tell you? Is it appropriate, compared to the scatterplot?
c. Find the least-squares regression line to predict Y from X and draw it on a scatterplot of the data.
d. Find the standard error of estimate. What does it tell you?
e. Find the standard error of the slope coefficient. f. Find the 95% confidence interval for the slope coefficient.
g. Test at the 5% level to see if the slope is significantly different from 0. Interpret the result.
h. Test at the 1% level to see if the slope is significantly different from 0.
Define f (r) to be the smallest integer n such that for all regular Markov chains with r states, the nth power of the transition matrix has all entries positive. It has been shown,14 that f (r) =r2 - 2r + 2.
What scale is used to measure delivery performance? What kind of variable is delivery performance? Construct a frequency table for delivery performance for last month.
In the following regression output using data on 40 ferns In Ine textile Industry, the variable PROFIT is measured in millions of dollars per year. ADV Is expenditure on advertising per year in millions. and RD Is expenditure on research ar4 develo..
the mean number of shares traded on on the new york stock exchange in june 2004 was 2.4 billion per day. assume that
During a typical Pennsylvania winter, I80 averages 1.6 potholes per 10 miles. A certain county is responsible for repairing potholes in a 30-mile stretch.
a large tank of fish from a hatchery is being delivered to a lake. the hatchery claims that the mean length of fish in
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After determining the percent change in the sizes of all culture sections, the researcher calculates the standard error for the treatment-minus-control difference using both the paired t -analysis and the two independent sample (Chapter 2) t -anal..
Previous research has shown that μ.5 pecks if chickens are exposed to white string. Conduct a test (at α=.01) to determine if the true mean number of pecks at blue string is less than μ.5 pecks.
Find the sampling plan if the producer's stipulation is to be satisfied exactly. Find the average sample number for lots that are 1.8% nonconforming.
According to the contract agreement, the materials engineer should be have 90% confidence that the estimate of the mean slump does not deviate from the specified value by more than 5 mm? From past experience, it has been found that the parameter o..
Human heights are known to be normally distributed. What is the probability that a randomly selected female is above 70 inches height
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