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Suppose that the mean of the annual return for common stocks from 2000 to 2012 was 8.5%, and the standard deviation of the annual return was 25.2%. Suppose also that during the same 12-year time span, the mean of the annual return for long-term government bonds was 1.6%, and the standard deviation was 7.0%. The distributions of annual returns for both common stocks and long-term government bonds are bell-shaped and approximately symmetric in this scenario. Assume that these distributions are distributed as normal random variables with the means and standard deviations given previously.
a. Find the probability that the return for common stocks will be greater than 2%.
b. Find the probability that the return for common stocks will be greater than 11%.
A group of investors wants to develop a chain of fast food cafés. In determining potential costs for each facility, they must consider, among other costs, the average monthly cost of electricity.
John conducted his study to measure self-esteem among victims of domestic violence before and after they complete an 8-week program for abuse victims with 10 individuals. He calculated t = 1.9 from his data.
Using the menu systems, request descriptive statistics (mean, s.d. and variance) for both your original variables
Each party's position must be statistically sound. Include as suitable graphs, computations, and statistical tests.
The sample was collected by interviewers going to people's homes in randomly chosen areas in each of the 9 countries. The population represented by this sample was:
Develop a hypothetical table of data using a grid of 3 rows and four columns.
Determine the event that the sum of the numbers falling uppermost is less than or equal to 7
A realtor took a random sample of records of sales of homes from the files maintained by the Albuquerque Board of Realtors.
Describe the standard normal distribution. Explain why it can be used to find probabilities for all normal distributions.
A random sample of 72 statistics students was taken to estimate the proportion of students who are also in the Math Club. The 90% confidence interval was 0.438 to 0.642. Using this information, what sample size would be necessary to estimate the t..
Using your knowledge of infectious disease epidemiology, quantify the pattern of disease X in this group, i.e., what are the infectivity, pathogenicity, and virulence of disease X?
In the real world, a given null hypothesis is false; but the collected data lead to the null hypothesis being accepted. That is, the data lead to a failure to reject the null hypothesis.
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