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Normal approximation to the binomial distribution.
According to a hospital administrator, historical records over the past 10 years have shown that 20 percent of major surgery patients are dissatisfied with after-surgery care in the hospital. A scientific poll based on 400 hospital patients has just been conducted. What is the probability that less than 64 patients will not be satisfied with the after-surgery care?
Internal study by Technology Services department at Lahey Electronics disclosed company employees get the average of 2 emails per hour. Suppose arrival of these emails is approximated by Poisson distribution.
Using the following data on 15 workers, construct an exact 95% confidence interval for µ.
A researcher uses hypothesis test to estimate H0 µ= 80. Which combination of factors is most probable to result in rejecting null hypothesis?
A sample of n observations is taken from a population. When performing statistical inference about a population variance, the appropriate chi-square distribution has:
The margin of error for a 95% confidence interval estimate for the proportion of all students with cell phones is
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study so that the two factors are smoking level and gender.
We assume that the population is approximately normally distributed. Find the confidence interval: for a confidence level of 95%:
The chance both flights are full is 0.6. Are the two flights being full independent events and What was the mean ranking for the females in this class
Data is distribution of the most popular colors for 2005 model luxury cars made in North America. Design the pie chart and bar graph for data.
What is the probability that a randomly chosen eight-week old baby smiles between 2 and 18 seconds?
At the 0.05 significance level, can he conclude that number of absences has declined? calculate approximately the p -value.
Would it be reasonable to conclude that the 5 percent of the employees are not able to pass the random drug test?
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