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A 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:
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.
The average score on math portion of SAT was 516 in 2002. Assume that the math score of all students taking the SAT 2002 were normally distributed with a mean of 516 and a standard deviation of 90.
Prior to a statewide senate election, three polls are conducted concerning a particular candidate's popularity. In the first poll, 750 of 1500 voters favor the candidate.
a) Determine the proportion of instances that the duration was less than 240 seconds. Also express the proportion as a percent. (hint: proportion is number of successes divided by total number.)
a study shows that approximately 15 of all businessmen who wear ties wear them to tight. at a board meeting of 25 all
If the manufacturer's claim is true, what is the probability that the claim will be rejected?
An industry consists of two firms. The demand function for the product of firm i is qi = 24 - 5 pi + 2 p j . The marginal cost of production for each firm is zero. Find the price best-response function for firm i.
What sampling method is best suited for such a survey? Why? Draw the sample using the random number table and bring out the rationale of the procedure. Limit your sample to 25 persons.
What is the value of sample mean? If the interval represents 90 % confidence interval, what would the 99 % confidence interval be?
a sample of 9 quiz scores had a mean of 15.2 and a sample standard deviation of s 3.3. if it is known that the quiz
At.05 significance level, can we conclude that larger proportion of the agents think the economy is expanding this month?
Suppose the organizers of the study are reconsidering their sample-size estimate. How many participants should be enrolled in each of the active and control intervention groups to achieve 80% power if a two-sided test is used with α = .05
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? What is the p-value?
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