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A prospective cohort study showed that 200 new cases of disease X occurred in 2,000 person-years. Calculate the person-time incidence rate and 95% confidence interval? Please show work.
Discuss the advantages of applying the PERT system for managing medical projects. Provide specific healthcare examples related to your own work or interests.
According to a poll on consumer behavior, 36% of people say they will only consider cars manufactured in their country when purchasing a new car. Suppose you select a random sample of 100 respondent
If you want to be 95% confident of estimating the population proportion to within a sampling error of (plus or minus 0.05 ) and there is historical evidence that the population proportion is approx
If you want to be 95% confident of estimating the population mean to within a sampling error of (Plus or minus 6) and the standard deviation is assumed to be 18, what sample size is required?
Based on interviews with 81 SARS patients, researchers found that the mean incubation period was 4.6 days, with a standard deviation of 15.9 days. Based on this information, construct a 95% confiden
What is an example of a variable for which we would use a X^2 test?
Why is it popular for advertisments to always state a confidence interval? Give an example of where you have seen this.
If you test 2 different lightbulbs from a box of 100 bulbs that contains 1 defective bulb what is the probabilty that both light bulbs that you test are defective?
A company can sell 100x machine parts if it charges 10-0.1x dollar for each machine part. How many machine parts can be the company sell if it charges $ 4.00 for each machine part?
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter in bet
A researcher collects data on two independent samples. The first group consists of 20 human subjects, has a sample mean of 4.21, and a standard deviation of 1.4. The second group consists of 20 subj
The standard deviation of a normally distributed population is equal to 10. A sample size of 25 is selected, and its mean is found to be 95.
It is known that monthly spending by individuals in a community is normally distributed. To estimate the average monthly spending, a statistician asked 4 people randomly about their monthly spending
During a recent year the average cost of making a movie was $54.8 million. This year, a random sample of 15 recent action movies had an average production cost of $62.3 million with a variance of $9
An engineer has 3 factors (Speed, Temperature, and Time) that she has to understand the effect on volume of liquid dispersed into bottles. Her boss wants a good second order model of the volume to a
The scores on a standardized test had mean of 2.711 and a standard deviation of 1.335. A teacher had 61 students take the test. Although the students were obviously not a random sample, she consider
Suppose duration of human pregnancies are somewhat skewed with a mean of 262 days and a standard deviation of 15 days. Suppose a certain obstetrician is currently providing prenatal care to 40 preg
The distribution of weekly salaries at a large company is right skewed with a mean of $1000 and a standard deviation of $350. What is the probability that the sampling error made in estimating the m
A bank's loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. If an applicant is randomly selected, find the probability
A waiter believe the distribution of his tips has a model that is slightly skewed to the left, with a mean of $9.20 and a standard deciation of $5.20. He waits on 40 parties over a weekend of work.
A study of employees at a large company found a negative correlation between body weight and distance walked on an average day. In other words, people who walked more weighed less. Should you concl
What is a x2 test, and what type of data would we use with it to test a hypothesis? What is an example of a variable for which we would use a x2 test?
What type (and level) of data must you collect to conduct a t-test? Why? What are examples of variables with which we would use a t-test?
What are some examples of two measurement-level (quantitative) variables that are likely to be correlated because they are both changing over time?