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What kind of studies are these? (ex of studies: obersvational, double-blind, an experiment not double blinded and matched pairs)
-In order to determine if smoking causes cancer, researchers surveyed a large sample of adults. For each adult, they recorded whether the person had smoked regularly at any period in their life and whether the person had cancer. They then compared the proportion of cancer cases in those who had smoked regularly at some time in their lives with the proportion of cases in those who had never smoked regularly at any point in their lives. The researchers found that there was a higher proportion of cancer cases among those who had smoked regularly than among those who had never smoked regularly.
-Will a fluoride mouthwash used after brushing reduce cavities? Twenty sets of twins were used to investigate this question. One member of each set of twins used the mouthwash after each brushing, the other did not. After 6 months, the difference in the number of cavities of those using the mouthwash was compared with the number of cavities of those who did not use the mouthwash
-Sickle-cell disease is a painful disorder of the red blood cells that in the United States affects mostly black persons. To investigate whether the drug hydroxyurea can reduce the pain associated with sickle-cell disease, a study by the National Institutes of Health gave the drug to 150 sickle-cell sufferers and a placebo to another 150. Neither the participants nor the researchers knew who had received each type of treatment. The researchers then counted the number of episodes of pain reported by each subject
If you purchased a model Acar, what is the probability that the new car will have zero problems? If you purchased a model A car, what is the probability that the new car will have two or fewer problems?
the diameters of a new species of apple have a bell-shaped distribution with a mean of 7.26cm and a standard deviation
Buy-side versus sell-side analysts' earnings forecasts. Harvard Business School professors carried out a comparison of earnings forecasts of buy-side.
Your former supervisor works for the company and is recommending you for the position based on your outstanding job performance; if you want the job, it's yours.
What is the average and standard deviation measured in degrees of Fahrenheit. [Hint: F=(9/5)C+ 32]
If you are the sales manager of Universal Studies Singapore, how would you price the entry tickets? Explain using the concepts like elasticity and revenue.
1. questions based on a distribution of scores with and the standard deviation 6.38. draw a small picture to help
Fitting of multiple linear regression equation - Give a list of the model assumptions for a regression model.
Assume you are considering a customer with an average purchase of 5 dollars with a standard deviation of 5 dollars.
a. Calculate the values of the sample mean and the standard deviation. b. Compute the upper quartile, the lower quartile, and the interquartile range.
which of the following statements best describes the meaning of estimation in statistics?estimation determines the most
A researcher selects a random example of college students and measures number of hours they spend watching television per week and their grade point average.
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