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1. Angioplasty is a medical procedure in which an obstructed blood vessel is widened. In some cases, a wire mesh tube, called a stent, is placed in the vessel to help it remain open. One article presents the results of a study comparing the effectiveness of a bare metal stent with one that that has been coated with a drug designed to prevent reblocking of the vessel. A total of 5320 patients received bare metal stents, and of these, 841 needed treatment for reblocking within a year. A total of 1120 received drug coated stents, and 134 of them required treatment within a year.a. Find a 98% CI for the differences between the proportions for drug coated stents and bare metal stents.
There are k types of distinct postcards. How many ways are there to send these postcards to n friends? (Each friend can get zero cards, also multiple copies of the same card.)
A company selects five of the machines at random, thinking all are in working condition. What is the probability that all five of the machines are nondefective?
The researchers made 10 measurements of ATP, which had x = 0.84. What was the sample standard deviations for these measurements?
The sample standard deviation is $2,050. Using this information, calculate the 95% confidence interval (rounded to the nearest $10). Interpret your findings.
Given that Vacationer will travel less than 500 miles, Find out the probability that he/she will drive or take the Bus/Train?
How would I go about finding a 95% confidence interval for the population mean if a sample of size 20 has a mean of 18.2 and a sample standard deviation of 3.6?
Prove that there are no integers x, y, and z such that. Show that square root of 2 cubed is an irrational number.
Student record revealed that 16 out of a random sample of 64 of student with loans. It supposed that current rate is persisting across all students. Compute probability that number of students with loans will be less than 375.
Twenty air samples were obtained and the carbon monoxide concentrations were recorded. the results in ppm (parts per million) were:
If measurements are made over span of 9 months, and results are averaged, find out the probability that neighbourhood is considered unsafe?
Give the 90% confidence interval for the mean score in the population of all young women.
A person makes random guesses for 10 true-false questions on a test. Find the probability that the student answers at least one question correctly.
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