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Suppose that the proportion of a certain disease in the population is p=0.2. Consider a simple random sample of n=116 people. Denote by X the number of people in the sample that have the disease. Calculate the following probabilites. P(X=23)=?
What is overall mean and standard deviation of the test scores? Sketch the distribution and show where you are and where your friend is?
If the test is positive, what is the probability that this person actually has heart disease?
A sample of 81 observations is selected from a normal population with a standard deviation of 5. The sample mean is 40. Determine the 95% confidence interval for the population mean.
The probability is 90% that the sample percentage is contained within what symmetrical limits of the population percentage?
A chemical process converts lead to gold. However, the production varies due to the powers of the alchemist. It is known that the process is normally distributed, with a standard deviation of 2.5 g. How many samples must be taken to be 90% certain..
A manufacturer of billiard balls is testing three additives to the basic plastic. Show the partial ANOVA table
Polls showed the two main candidates in the 2004 presidential election were nearly tied on the day before the election. To predict the winner a newspaper would like to have a poll that has margin of error less than 1%. Roughly how large a sample w..
Prices (in dollars) were recorded for a sample of 60 randomly selected grocery items at each of the three supermarkets. In order to reduce item-to-item variation, the prices were recorded for each item on the same day at each supermarket. Identify..
Perform all pairwise comparisons among the three programs, using a Tukey adjustment and an overall significance level of 0.05, then interpret all your results.
What do we use the F Distribution to test? Provide an example from your place of employment or circle of influence of an instance when you could use the F Distribution.
The January 17, 1994 issue of Time magazine reported that 58% of adult Americans said yes to the question "If you or your spouse were pregnant, would you want the unborn child tested for genetic defects?"
Here are data on attitudes toward coffee filters made of recycled paper. The data was gathered from a random sample. What is the conditional distribution of opinion about quality of recycled coffee filters for buyers?
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