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A researcher wants to perform a hypothesis test to determine whether the mean length of marriages in california differs from the mean length of marriages in texas. Identify the variable for the prop
If 0.8% of the fuses delivered to an arsenal are defective, use the Poisson approximation to determine the probability that 4 fuses will be defective in a random sample of 400.
Suppose IQ scores were obtained from randomly selected siblings. For 20 such pairs of people, the linear correlation of coefficient is 0.880 and the equation of the regression linearis Y^=5.71 + 0.9
The margin of error will increase because the critical value will increase. The increased margin of error will cause the confidence interval to be wider.
A fair coin is tossed 10,000 times. Find a number m such that the chance of the number of heads being between 5000-m and 5000+m is approximately 2/3.
Find the standardized scores for both students. Assuming that both tests measure the same kind of ability, who had the higher score? (choose the best answer)
What is the probability that a home loan extended by La Crosse has an adjustable rate and is for a term of 15 years? What is the probability that a home loan extended by La Crosse is for a term of 15
Brian, a landscape architect, submitted a bid on each of three home landscaping projects. He estimates that the probabilities of winning the bid on Project A, Project B, and Project C are 0.8, 0.5,
In a home theater system, the probability that the video components need repair within 1 year is 0.04, the probability that the electronic components need repair within 1 year is 0.006, and the prob
Each of four persons, named 1,2,3,4 fires one shot at a target. Let Ak denote the event that person K hits the target,where K=1,2,3,4. Assume A1,A2,A3,A4, are independent events .If P(A1)=0.7 , P(A2
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