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Test the significant difference between the two population proportions.
Does lovastatin (a cholesterol-lowering drug) reduce the risk of heart attack? In a Texas study, researchers gave lovastatin to 2,325 people and an inactive substitute to 2,081 people (average age 58). After 5 years, 57 of the lovastatin group had suffered a heart attack, compared with 97 for the inactive pill. a) State the appropriate hypotheses.
b) Obtain a test statistic and p-value. Interpret the results at = .01.
c) Is normality assured?
d) Is the difference large enough to be important?
e) What else would medical researchers need to know before prescribing this drug widely?
Using variables below, (1) mention all research questions that would be replied with a Two Way ANOVA test, (2) make null hypotheses for these questions.
The market model relating the rate of return of stock XYZ (denoted RXYZ) to the rate of return Of a broader index of the stock market (denoted RM) is reported as:
What is the appropriate conclusion based on the outcome of the hypothesis test?
Compute the value of the proportion of the population.
Perform the chi-square test for a uniform distribution. At α = . 01, does this sample contradict the assumption that readership is uniformly distributed?
Determine the coefficient of correlation between the two variables. Interpret the value.
Below is a normal plot of residuals from a regression. Does the plot indicate any problems with the assumption that the residuals are Normally distributed
Compute the sample variance and sample standard deviation as a measure of volatility of monthly total return for Chevron (to 2 decimals): Sample variance and Sample standard deviation.
he population consists of all 15 year olds living in the attendance district of a local high school. You plan to obtain a simple random sample of 200 such residents by using the roster of the high school as the sampling frame.
Create a set of n observations from the binomial distribution with 1 trial and the event probability of 0.007, where n is your answer.
Researchers at a pharmaceutical company have found that the effective time duration of a safe dosage of a pain relief drug is normally distributed with mean 2 hours and standard deviation 0.3 hour.
Compute the value of t. What is your decision regarding the null hypothesis? Briefly summarize your results.
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