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Question: A black and red die are thrown and let X be a random variable denoting the sum of the dice.
a. Find all sample points of the experiment.
b. What is X's expected value, variance and the standard deviation?
c. What percent of the values of X lie within two standard deviations from the mean?
d. What is the probability of getting a sum of 7 in the experiment?
You wish to determine whether consumers have made substantial progress in reducing their credit card debt? Based on a sample of 1000 consumers in September 2001,
The probability of a z falling between two points equidistant from the mean, one to the left of the mean and the other to the right og the mean is 99% what are the z ranges.
In Excel use the Descriptive Statistics and comment on the mean, the skewness, the standard deviation and kurtosis.
Leading product are falling leading to declining revenues. Draft a research proposal for the client based on a scientific methodology.
The STATDisk results from analysis of variance using a 0.05 significance level are shown below. Identify the test statistic, critical value, and p-value. what do you conclude?
The Rio-River Railroad, headquartered in Santa Fe, New Mexico, is trying to devise a method for allocating fuel costs to individual railroad cars on a particular route between Denver and Santa Fe.
Set up the null and alternative hypotheses for testing these claims. In order to conduct the test, the customer selected a significance level of alpha=.05. Interpret this value. (I.e. what does it mean to conduct the test at a level of alpha=.05)
An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent.
Based on these results, a confidence interval for the population mean is found to be μ = 5.7 ± 4.4. Find the degree of confidence.
If the computed value of F is 5.01 and the critical value is 2.67, we would conclude that all the population means are equal. Unlike student’s t distribution, there is only one F distribution.
The sum of the cross-products of Z scores gives you a large positive number if there is a positive correlation and a large negative number if there is a negative correlation.
A college is considering making the purchase of a laptop computer a requirement for some of its programs. In the past, only 20% of students owned laptop computers. A random sample of 300 students revealed that 77 of them had laptop computers
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