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1) According to a study conducted by Dell Computers, 65% of men and 70% of women say that weight is a very important factor in purchasing a laptop computer. Suppose this survey was conducted using 374 men and 481 women. Do these data show enough evidence to support the conclusion that there is no difference in the proportion of men and women who think weight is a factor in purchasing a laptop? Use a 5% level of significance.
2) In a study of annual salaries of employees, random samples were selected from two companies to see if there is a difference in their average annual salaries. For Company "A" the sample size was 72, the sample mean was $48,000 and the sample standard deviation was $12,000. For Company "B" the sample size was 50, the sample mean was $43,000 and the sample standard deviation was $10,000. Test for a significant difference in salaries at a 5% level of significance. What is your conclusion?
Income level of the industrial salespeople and their employment status. Be sure to state the critical value, the value of the Chi-square test statistic, and your decision (accept/reject).
Let P(1) and P(2) denote transition probability matrices for ergodic Markov chains having the same state space. Let π1 and π2 denote the stationary (limiting) proba- bility vectors for the two chains. Consider a process de?ned as follows:
Consider the relationship between written (and, perhaps, otherwiserecorded) imaginative literature and English dialectal variation. How has literaturecontributed to our awareness/understanding of the various Englishes around us?
Suppose you participate in a chess tournament in which you play n games. Since you are a very average player, each game is equally likely to be a win, a loss, or a tie. You collect 2 points for each win, 1 point for each tie, and 0 points for each..
Furthermore, the data shows that 35% of the females who visited his store purchased a cell phone, while 20% of the males who visited his store purchased a cell phone. What is the probability that a female customer will purchase a cell phone?
The table at the bottom of the page shows how the history and economics scores of 25 students are distributed. Use the method of Exercise 32 to determine the value of r, replacing the row headings by the corresponding class marks (midpoints) 23, 2..
would this prove that they are exceeding their goal, using = .025?
Suppose that an automobile manufacturer designed a radically new lightweight engine and wants to recommend the grade of gasoline to use.
Let X denote number of students which were on bus carrying this arbitarily selected student. One of the 4 bus drivers is also arbitarily selected. Calculate expectations and variances of X.
suppose that two electronic components in the guidance system for a missile operate independently and that each has a
1. investigating a particular stock you estimate the following returns and their associated probabilitiesprobability
An adaptive cluster sample initially selects a random sample of n = 4 strips from the N = 25 in the study region. Each strip contains M = 12 secondary units. Neighborhoods are defined to include adjacent secondary units as in the example in the te..
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