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Optimism and LongevityA cancer specialist from the Los Angeles County General Hospital (LACGH) rated patient optimism in 20- to 40-year-old male patients with incurable cancer in 1970. In 1990, the researcher examined hospital records to gather the following data:• Socioeconomic status (1-7 rating of occupation; higher ratings indicate higher levels of SES)• Age in 1970• Optimism in 1970 (1-100 rating, higher scores indicate higher levels of optimism)• Longevity (years lived after the 1970 diagnosis)Using the SPSS data file for Module 7 (located in Topic Materials), calculate a simultaneous multiple regression with SES, age, and optimism as the independent variables and longevity as the dependent variable.1. Do the independent variables correlate statistically significantly and practically with the dependent variable?2. Is collinearity between the independent variables a concern?3. What is the R and adjusted R-square for all independent variables entered simultaneously?4. What variable(s) provide a significant unique contribution(s)?5. Compose a results section for this statistical analysis.
Plot the control limits for the mean outside diameter and the range.
Assume the arrival of these emails is approximated by the Poisson distribution.
The company has evidence that its line produces %0.9 of noncorforming items. What is the probability that an item selected for inspection is classified as defective?
What is the probability that the project will be completed in 17 months or less?
You are trying to get an important new customer to buy a product that you produce. Their decision to buy depends on the speed at which you can produce the product once they have placed the order.
The following table gives the coal usage and electricity generated by ten randomly selected power stations in South Africa in 1992:
A large electronics company wants to estimate the proportion of all households that own GPS machines. What sample size is required that would give the maximum error of 2.0% for a 95% confidence interval? An unscientific survey had a result of 30%.
Probability of selecting a household with no children that is equal to the value obtained by the census. Give the z statistic (rounded to two decimal places) and the P-value. What do you conclude?
Either direction from what would have been obtained by interviewing all voters in the United States. Find the sample size suggested by this statement.
If we assume that the download times are normally distributed, what percent of users will wait between 5 and 10 seconds for the homepage to download?
Suppose the p-value for these test is 0.03. Is the difference in percentages at a 5% level? Explain. Suppose the p-value for this test is 0.03. Is the difference in percentages significant at a 1% level? Explain. What is the overall (weighted) sample..
Critically discuss some examples of descriptive statistics? Why are they used in research? What is a confidence interval?
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