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1) Does correlation equal causation? Does the strength of correlation depend on the direction of the relationship? What is the meaning of a zero correlation? Explain your answers.
2) Three possible correlation distributions are positive, negative and zero. Explain each of these and provide an example of each.
3) Define: correlation coefficient, coefficient of determination, non-linear,and reliability.
4) Explain what ‘least square - a line of best fit' means.
5) What is the regression equation? What are the components and define or explain each component.
How is it possible to utilize a regression analysis in the real world? What are some of its value Responses should be about 150 words
Random samples of populations (in thousands) of U.S. cities in three sections of the country are listed. Is there evidence to conclude a difference in means at the 0.001 level of significance?
Suppose you are waiting for your federal tax refund. On average, how many weeks would you have to wait before receiving your refund?
What is the probability you will win any money in the state lottery and the probability that you will win at least $100
Create a hypothesis test which will investigate the variances. Label all steps for your test and show and label each step of the test procedure at a .1 level of significance.
A group of students collected data at the Cedar Point amusement park and reported that the "wait time" to ride the "Top Thrill Dragster" roller coaster is consistently distributed within a range of 40 minutes to 90 minutes.
A researcher wishes to estimate within $300 the true average amount of money a country spends on road repairs each year. If she wants to be 90% confident, how large a sample is necessary? The standard deviation is known to be $900.
When estimating the mean of a population, how large must the sample be in order that the 95% error margin is 1/8 the standard deviation?
If she performs 15 demonstrations this week, what is the probability of her being satisfactory? What is the probability of between 4 and 8 (inclusive) orders?
In a study of hypnosis, breathing patterns were observed in an experimental group of subjects in a control group. The measurements of total ventilation (liters of air per minute per square meter of body area) are shown below.
In order to test the assumption of a Poisson distribution, a random sample of 150 ten-minute intervals was taken.
Suppose that the critical region for a certain test of hypothesis is of the form T greater than or equal to 2.5 and the computed value of T from the data is -2.75.
Today, around the world, Churchill"s name is revered. There are Winston Churchill Societies in most countries. Adolf Hitler and Nazi Germany. Which of these men is a hero? Winston Churchill or Neville Chamberlain?
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