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a study was designed to compare two energy drink commercials. Each participant was shown the commercials in random order and asked to select the better one. Commercial A was selected by 45 out of 100 women and 80 out of 140 men. A large-sample 95% confidence interval for this difference is?
Gain follows the modern practice of using probability estimates of sales. The military division estimates its sales as follows. Find the standard deviation of the estimated profit, Z = 2000X + 3500Y.
Assuming that the process is operating correctly according to specifications, what is the probability that a sample will indicate that an adjustment is needed?
43 students, 22are sophomores, 28are chemistry majors, and 11are neither. What are the probability that the student is both a sophomore and a chemistry major?
You are a researcher who is interested in the effect of child care on the attachment which develops between an infant and a caregiver.
The current advertising campaign for a major automobile brand would be changed if fewer than 70 percent of the consumers like it.
Tests it and then puts it to one side. this is repeated 5 times. What is the probabilty that none of the five tested were faulty?
Can we conclude that there is a difference in number of citations written between the officers? Use the 0.05 level of significance.
Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations of X and Y.
Jerry however is unsure the 0.6 probability of a favorable marketing research study is correct. How sensitive is Jerry's decision to this probability value ? How far can this probability value deviate from 0.6 without causing Jerry to change his d..
Assuming that X is a normal R.V. with mean 1000 and variance 2500, find the probability that a resistor picked at random will be rejected.
The waiting time to place an order at a branch of a fast-food chain during the lunch hour has had population mean of 3.55 minutes, with a population standard deviation of 1.1 minute.
He would like to determine whether there are more units produced on the afternoon shift than on the day shift.
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