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A professor is interested in how many hours he students spend studying per week. She takes a random sample of 8 of her students and finds they study an average of 7 hours a week with a standard devi
A random sample of 16 CSN students is taken. The average age in the sample was 27 years with a standard deviation of 4 years. Construct and interpret a 95 % confidence interval for the average age o
A sample of Alzheimer's patients is tested to assess the amount of time in stage IV sleep. The number of minutes spent is Stage IV sleep is recorded for a random sample of 61 Alzheimer's patients. T
In an analysis investigating the usefulness of pennies, the cents portions of 100 randomly selected credit card charges from the author are recorded they have a mean of 47.6 cents and a standard dev
Suppose the conditional distribution of Y given X = x is Gamma with ? = 4 and ? = 1/x and the marginal distribution of X is exponential with mean 2 a)Find the conditional mean and variance of Y give
A study is to be conducted on the proportion of U.S. citizens who believe the minimum wage should be raised. What is the minimum number of people that should be included in the study if we want to e
What is the expected number of times that you play prior to the game ending? What is the answer to these two questions if both you and your opponent started with 75 cents?
You purchase a new motor vehicle and are considering purchasing an extended bumper-to-bumber warranty. The extended warranty adds 3 years of protection to the basic warranty and costs $3,000. The fo
Using the p value method, test if Vitamin C reduces the average time to recovery.
It has been stated that 62% of Americans drink beer, wine, or hard liquor at least occasionally. A study was later conducted to determine the validity of this percentage. Which of the following 95%
A test consists of 10 true or false questions. to pass the test a student must answer at least 8 questions correctly. if a student guess on each question, what is the probability that the student w
In a poll of n = 200 randomly selected individuals, 60 people said they are opposed to the death penalty for persons convicted of murder. Determine the margin of error for a 95% confidence interval
Several years ago, in a survey of n = 625 randomly selected adults, a polling organization asked: "Do you favor lowering the legal blood alcohol limit for drunk driving to 0.08% (from 0.10%)?" In t
In order to compare failure rates for two brands of tires, a sample of 600 tires of Brand A was taken, of which 36 failed. For a sample of 800 tires of Brand B, 32 failed. Can we conclude at the 0.0
You wish to test the claim that ? > 33 at a level of significance of ? = 0.05 and are given sample statistics n = 50, x = 33.3, and s = 1.2. Compute the value of the standardized test statistic.
One set of 20 pairs of scores, X and Y values, produces a correlation of r=0.70. If SSy = 150, find the standard error of estimate for the regression line.
In a random sample of 60 refrigerators, the mean repair cost was $150.00 and the standard deviation was $15.50. Construct a 99% confidence interval for the population mean repair cost.
Use the weights of cans of generic soda as sample one and use the weights of cans of the diet version of that soda as sample two. Assume that the two samples are independent simple random samples se
Test the claim that the mean time Americans spend watching TV per day is 4.4 hours at the 0.10 level of significance. A random sample of 80 people had a mean time of 2.225 hours viewing per day and
At the 0.01 level of significance, test the claim that the percent of drivers who are 35 years old or younger and who run red lights is higher than the percent of drivers who are older than 35 years
A physician claims that 13.6% of all pregnant females smoke during their pregnancy. A random sample of 400 pregnant women revealed that 60 of them are smoking while pregnant. Test the physician's cl
A math instructor has written a new placement exam. He is concerned that the exam may be too long. The instructor claims that the average length of time required to finish the exam for all students
Give an example of global sustainability that demonstrates your understanding of the concept.
If the batteries from a particular production run have an actual mean use life of 385 hours, the production manager wants a sampling procedure that only 10% of the time would show erroneously that t