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In a test of the effectiveness of garlic for lowering cholesterol, 42 subjects were treated with garlic in a proceessed tablet form.
A study of Math 1530 students on the first day of class asked the question " How many pairs of shoes do you own?"
A second random sample of 30 bowlers at Ethel's Bowling Alley has a mean of 18. Using the criterion of p = .05 and both tails of the sampling distribution, decide if each sample represents the popul
In a sample of children given a new flu vaccine, a large number of the children develop a neurological disease. Parents claim the vaccine causes the disease. What is the Same Old Problem when applie
We measure the self-esteem scores of a sample of statistics students, reasoning that this course may lower their self-esteem relative to that of the typical college student 1 ? 5 55 and ?X 5 11
Researcher A finds a significant relationship between increasing stress level and ability to concentrate. Researcher B replicates this study but finds a non-significant relationship. Identify the st
In the fall semester of 2011, 48.1% of the students at a university were women. Suppose that two students in the University are selected at random. Using the probability tree method, calculate:
In a study of drug testing of Olympic athletes at the university of Texas in 2004 an athlete was either and illegal user or not an illegal drug user. Let U denote an athlete who is an illegal grug u
A skateboarder have a 96% success to do an ollie in his first try. He is given 3 tries to do an ollie. Each try is statiscally independent. Probability that the skateboarder will do an ollie in his
What is the probability that this system will complete an assigned mission? Given the information that the system completed its assigned mission, what is the probability that it was actually in-contr
The local newspaper was interested in the proportion of people that would vote in favor of a bond issue to add a new sewage treatment plant. The paper contacted 80 registered voters and found that 2
Develop a joint probability table with three rows (airlines) and two columns (on-time arrivals vs. late arrivals). An announcement has just been made that Flight 1424 will be arriving at gate 20 in c
A christmas string contains 15 lights, 6 are damage, you have to replace them with 6 new lights but don't know which are the damage lights.
A student at a large university is conducting a study of political feelings of students at his university. The student took a simple random sample of 500 students and found that a proportion of 0.36
Researchers at the University of Pennsylvania School of Medicine have determined that children under 2 years old who sleep with the lights on have a 34% chance of becoming myopic before they are 16.
A textile manufacturing process finds that on average, 3 flaws occur per every 180 yards of material produced. What is the probability of exactly 1 flaws in a 180-yard piece of material? (Round your
One test that people who wish to donate blood must undergo is a test of iron level. Individuals with insuficient iron levels are not permitted to donate blood. A preliminary inexpensive screening te
Three fair regular eight-sided dice are rolled. What is the probability that the sum of the die rolls is10?
In other words, the true positive rate is 84%, and the false positive rate is 23%. 20% of the adult population is hypertensive. If an individual is randomly selected from this population and the mac
A computer center has three printers, A, B and C, which print at different speeds. Programs are routed to the first available printer. The probability that the program to printers A, b and C are 0.6
A biometric security device using fingerprints erroneously refuses to admit 2 in 1,000 authorized persons from a facility containing classified information. The device will erroneously admit 2 in 1,
70% of light aircraft that disappear while flying in a certain country are subsequently discovered. Of the aircraft that are discovered, 60% have an emergancy locator, whereas 90% of the aircraft no
In the setup of a manufacturing process, the probability that a machine is correctly adjusted is .98. When correctly adjusted, the machine operates with a 4% defective rate. However, if it is incorr
An experiment consists of tossing six fair coins. Determine the probability density and cumulative distribution function for the number of heads that will appear in the experiment.