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Q1) Does lovastatin (a cholesterol-lowering drug) decrease risk of heart attack? In Texas study, researchers gave lovastatin to 2,325 people and inactive substitute to 2,081 people (average age 58). After 5 years, 57 of lovastatin group had suffered a heart attack, compared with 97 for the inactive pill.
a) Mention the suitable hypotheses.
b) Get a test statistic and p-value. Interpret results at α = .01.
c) Is normality assured?
d) Is the dissimilarity large enough to be significant?
e) What else would medical researchers require to know before prescribing this drug widely?
Illustrate what does weighting add to usefulness of moving averages and explain how is it done. The yield on a thirty year treasury note at the end of every year since 1990 is recorded below.
What is the probability that the sum of their scores exceeds 1200 and probability that the average of the scores of all 400 student
What is the equation for least squares line? Calculate the coefficient of determination.
Is there evidence that the population mean is above $300, if X (bar) = $305.11 and s = $43.20?
Which combination of factors has greatest likelihood of rejecting null hypothesis?
The chi-square goodness of fit test can be used when we:
Such things as historical documents, newspaper reports, TV and radio broadcasts, when used in research, represents
Which combination of factors produces smallest risk of Type I error?
Using a 1% level of significance, can the hypothesis that the distributions for the student's scores are identical be accepted?
The Type 1 error states the probability of being wrong whenever:
First explain what the Gini coefficient is and what hypothetical Gini values of 0 and 1 mean. Sort the data by the Gini coefficient in 2000 and look at the list of countries.
The level of significance indicates the probability of rejecting a false null hypothesis.
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