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An investor owns three common stocks. Each stock, independent of each others, has equally likely chances to increase in value, decrease in value, or remain the same. Estimate the probability at least two of the stocks increase in value.
A test indicates the presence of a particular disease 90% of the time when the disease is present and the presence of the disease 2% of the time when the disease is not present.
A report states that 40% of home owners had a vegetable garden. How large a sample is needed to estimate the true proportion of home owners who have vegetable gardens to within 4% with 95% confidence?
Suppose the distribution of amounts purchased follows normal distribution. For sample of 50 customers, reply the following questions. Determine the probability the sample mean is at least $25.00?
The following table gives the coal usage and electricity generated by ten randomly selected power stations in South Africa in 1992:
Explain and give examples of how the particular outcomes of a study can suggest if a particular threat is likely to have been present.
The chance that all 50 residents in a neighborhood end up being the sample of residents selected is: the population of the suburb divided by 50.
Consider the following news headline, "Cigarette Smokers Make Lower College Grades than Nonsmokers" The news article goes on to say that researchers at a university collected information on rate of cigarette smoking (total number of cigarettes sm..
A study is conducted to compare mean cholesterol levels for individuals following a low carbohydrate diet for at least 6 months to individuals following a conventional (low fat, low calorie )diet for at least 6 months.
What is the probability that the mean completion time is between 1 and 2 hours, i.e.., 60 and 120 minutes?
If we know that the length of time it takes a college student to find a parking spot in library parking lot follows a normal distribution with mean of 3.5 minutes and a standard deviation of 1 minute, determine the probability that a randomly sele..
Find a 98% confidence interval for the percentage of all eighth graders who have used alcohol. Round the upper and lower bounds to three decimal places.
Three companies are attempting to sell you a pollution reduction additive to your chemical waste. Given limited resources, which prevents you from developing the additive yourself, you get each company to give you a sample to the product.
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