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In a 2009 study of the effectiveness of tPa in the treatment of patients who have been hospitalized after myocardial infarction, 9 of 199 males receiving tPa and 13 of 97 males in the control group died within 12 months.
• Use the normal-theory method to test for significant differences in 12-month mortality between the two groups.
• Construct the observed and expected contingency tables for these data.
• Perform the test above using the contingency table method.
Then compare your results using the two different methods.
Triathalon Times Jeff Parent is a statistics instructor who participates in triathalons. Listed below are times (in minutes and seconds) he recorded as riding a bicycle for five laps through each mile of a 3-mile loop.
Compute the probability of exactly 0,1,2,3,4, and 5 arrivals per day.
Comparing the experimental and theoretical probabilities, can you say the die used in this experiment is a fair die? Why or why not?
The local operations manager for the IRS must decide whether to hire 1, 2, or 3 temporary workers. He estimates that net revenues will vary with how well taxpayers comply with the new tax code.
The ages of circulating pennies are right skewed. Most circulating pennies were minted relatively recently, and extremely old pennies are rare. Assume the ages of circulating pennies have a mean of 12.2 years and a standard deviation of 9.9 years.
At the .01 significance level can we conclude the mean age is more than 8.4 years for the cars of university students? State the null hypothesis and the alternate hypothesis.
Given this, compute the following probabilities for demand during lead time(DDLT).
The IQ scores of 30 children from under-privileged households, were measured before and a year after, a program of nutritional supplementation was instigated at a primary school.
The dying rate in an industrial process is department of many factors and varies according to the following distribution.
1) What is correlation? 2) What is an example of two variables that are likely to be correlated because they are both changing over time?
The assembly time for a product is uniformly distributed between 6 to 10 minutes.
If employee is chosen at random, determine the probability that employee is female and salaried staff? Choose the best answer from the following.
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