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For the population of employees, do the days for the highest number of absences occur with equal frequencies during a five-day work week?
An automobile association claims that less than 54% of fatal car accidents. Using a level of significance of 0.05, can the associations claim be supported?
What is the probability that this whole shipment will be accepted? Will almost all such shipments be accepted, or will many be rejected?
Given that a patient is still alive after 5 years, what is the probability the patient will still be alive 15 years after initial diagnosis?
Why the relationship between these two variables is important for a researcher or practitioner in your field of interest to understand more about.
What are the genotype frequencies among the females? What percentage of women in the population would be predicted to have hemophilia?
When 158 Saturday reservations are randomly selected from restaurant. Find a 95% confidence interval for true proportion of all reservations that are no-shows.
Provide the statistical model stating all assumptions. What is the probability of committing a Type I error. Evaluate the power of the test when u = 4960.
In January, Community hospital had 185 discharges, 9 deaths, and 2 autopsies. What is the gross autopsy rate?
Suppose that Consolidated Power decides to use a level of significance of a = .05. Perform the hypothesis test by using a critical value and a p-value.
For the next question, assume a simple random sample has been taken. Find the margin of error E that corresponds to the above statistics and confidence level.
What are the degrees of freedom in the overall F test? Assuming a = 0.05, How would you use p-value to decide whether to reject the null hypothesis or not?
A simple random sample of 100 postal employees is used to test if the average time postal employees have worked. What is the P-value for the test to show this?
What is the appropriate probability distribution to model X? What is the probability distribution of the time to arrival of the next failure?
Discuss the adequacy of the model that X follows a binomial distribution with n = 12 and p = 4/12.
They came back and counted 200 total rabbits and 5 were tagged. Using this information, what is the best estimate for the total number of rabbits in the park?
Compute the probability of getting more than 3 times of even numbers by using relative frequency.
Is the OLS-based estimator for each regression coefficient unbiased? Why? Provide mathematical arguments for your answer.
What is the best two variable regression model to predict average computer price? Is there a problem with using linear regression on this data?
Find the 60th percentile of the sample mean. Would it be unusual if the sample mean were greater than 580?
Suppose household 1 earns $40,265 and household 2 earns $56,078. What is the expected percent difference in wages between children?
According to the lottery's website, 2% percent of all tickets are winners. Find the expected value of buying a scratch-off lottery ticket.
Using the binomial distribution, find the probability that two or three women in a sample of twenty will never get married.
A set of biology exam scores are normally distributed with a mean of 70 points and a standard deviation. Find the probability that X is less than 73.
What is the probability density function for the time it takes to change the oil? What is the variance of the time it takes to change the oil?