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Suppose that a certain college class contains 35 students. Of these,23 are juniors,13 are economics majors, and 9 are neither. A student is selected at random from the class.
(a) What is the probability that the student is both a junior and an economics major?(b) Given that the student selected is a junior, what is the probability that he is also an economics major?
Discuss the use of standard deviation. Explain how it might be useful to you in your research and how you would explain results using standard deviation.
Absenteeism is distributed evenly throughout the week. The 0.01 level is to be used. The sample results are:
Based on responses from 1,015 randomly selected teens, which concluded that 44% of teens say grades are the greatest source of pressure, test the claim that fewer than half of all teens in the population feel that grades are the greatest source of..
A sample of n=20 has a mean of M=40. If the standard deviation is s=5, would a score of x=55 be considered an extreme value?
A random sample of 85 group leaders, supervisors, and similar personnel at General Motors revealed that, on the average, they spent 6.5 years on the job before being promoted.
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
The weight of an egg produced by a certain breed of hen is normally distributed with mean 66.1 grams (g) and standard deviation 5.5 g. If cartons of such eggs can be considered to be SRSs of size 12 from the population of all eggs, what is the pro..
Which of the following methods could be used to determine future order quantities? forecasting, regression, inventory models.
Distinct random variable
A random sample of gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 44.7 cents?
To test this claim, a researcher obtains information about registered drivers from the department of motor vehicles and selects a sample of n=300 accident reports from the police department.
What is the probability that a randomly selected monthly cell phone bill is more than $100?
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