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For a sample of 8 employees, a personnel director has collected the following data on ownership of company stock versus years with the firm.
X = years
Y = shares
6
300
12
408
14
560
252
9
288
13
650
15
630
522
a. Determine the least-squares regression line and interpret its slope.
b. For an employee who has been with the firm 10 years, what is the predicted number of shares of stock owned?
How optimal or non-optimal is today's level of economic inequality in the USA? This is the subject for a couple of writing assignments. Are we too equal? Too unequal? About right?
Suppose the counselor found the sum of squared deviations from the mean of the sample to be 135. Given that he tested 10 people, what would the estimated population variance be?
The weight of wrestlers is normally distributed with a mean of 300 pounds and a standard deviation of 40 pounds. What is the probability that a particular wrestler will weigh less than 250 pounds?
aj auction sells art drawings of little known artists at auction. the dealer is interested in the relationship between
Inmates who are in the state facility and 9 who have legal satisfaction scores of 5 or more. How do determine the probability for this because I have come up weird numbers.
the following are the hours of operation to failure of 38 light bulbs.150 389 345 310 20 310 175 376 334 340 332 331
At.05 level of significance, is there evidence to propose that mean life length of the batteries manufactured by this manufacturer is more than 400 hours?
the rates of on-time flights for commercial jets are continuously tracked by the u.s. department of transportation.
Pareto charts. Continue the study of the process of getting to work or class on time from Exercise 27.2. If you kept good records, you could make a Pareto chart of the reasons (special causes) for late arrivals at work or class. Make a Pareto char..
The data show the amounts (in thousands of dollars) of the contracts for soft drinks in randomly selected local school districts. Ata = 0.10, can it be concluded that there is a difference in the averages? Use the P-value method
Given the Gaussian random vector X in Problem 5.7.1, Y = AX + b, where
suppose that you add 10 to all of the observations in a sample. how does this change the sample mean? how does it
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