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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?
We are interested in testing to find out whether the variance of the population is vitally more than 0.003
Discuss whether the percent distribution of the cross-tab and chi-square supports/does not support the researcher's hypothesis.
The average number of hours of sleep per night that a college freshman gets is 6.50 with a standard deviation of 1.80 hours. If 35 college freshmen are randomly chosen find the probability that they average at least seven hours of sleep per night.
Determine the probability that none of the calculators will be defective?
The following table shows the number of miles driven in each trial.
Each party's position must be statistically sound. Include as suitable graphs, computations, and statistical tests.
Probability distribution described by the following density curve and The expected value of the sum of the weights of the two oranges, in pounds
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
The student with the 92 found a grading error on her exam and her correct grade was 95. There were no other grading errors. After correcting this student's paper, the five number summary for the midterm exam will be
Drug sniffing dogs must be 95% accurate. A new dog is being tested and is right in 46 of 50 trials. Find a 95% confidence interval for the proportion of times the dog will be correct.
A school tracks the absences of pupils as part of a flu surveillance system. Regular reporting of absences among 25 students in grade 1 are taken, and based on these data, the long-run proportion of absences under normal conditions is estimated to..
A test on zoology is to be given next week. Suppose 75 percent of the students study for the test and 25 percent do not. If a student studies for the exam, the probability that he or she will pass is 0.90. If the student does not study, the pro..
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