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A researcher would like to estimate the population proportion of adults living in a certain town who have at least a high school education. No information is available about its value. How large a sample size is needed to estimate it to within 0.15 with 99% confidence?
If only one bolt is chosen, determine the probability that it will be found defective for only 1 reason (that is. it is either too large or has poor workmanship, but not both.)
What sample size would be needed to estimate the true proportion of students at your college
I scheduled three calls for a particular day, and each call has a probability of 0.5 of making a sale. What are his probabilities of making (a) three sales, (b) two or more sales, (c) no sales?
Teacher asked each of her students how many novels they had read in previous six months. Results are shown below. Create the frequency table for the number of novels read.
Determine if there is evidence to conclude that the mean number of vacations taken by married individuals is less then the number taken by single/divorced individuals using data in Excel file vacation survey.
A consumer purchases 12 frozen chickens. What is the probability that the consumer will have more than 6 contaminated chickens.
A sample of 16 patients in a doctors office showed that they had to wait an average of 43 minutes with a standard deviation of 8 minutes before they could see doctor. Provide a 99% confidence interval for the average waiting time for all of the pa..
Suppose we want to compare the observed and expected number of events among the group 250 treatments.
An official of the Iowa Department of Highways wants to compare the useful life, in months, of two brands of paint used for striping roads. The mean number of months Cooper Paint lasted was 36.2 with a standard deviation of 1.114 months.
The hypotheses are as follows: Null Hypothesis: μD ≤ 0, Alternative Hypothesis: μD > 0. From her data, the resesarcher calculates a p-value of 0.0162. What is the appropriate conclusion? The difference was calucated as (after - before).
Describe the meaning of alternatives, criteria and states of nature. How are they utilized in decision analysis?
There is a probability that the river will flood next year. Riverside's profits for the coming year depend on whether Laura buys the flood insurance and whether the river floods.
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