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Seventy-seven percent of the light aircraft that disappear while in flight in a certain country are subsequently discovered. Of the aircraft that are discovered, 64% have an emergency locator, whereas 87% of the aircraft not discovered do not have such a locator. Suppose a light aircraft has disappeared. (Round your answers to three decimal places.)
(a) If it has an emergency locator, what is the probability that it will not be discovered?
(b) If it does not have an emergency locator, what is the probability that it will be discovered?
A random sample of 48 managers of large hotels has mean X‾= 5.91. The null hypothesis for the researcher's test is?
A manufacturer claims that the mean lifetime,M , of its light bulbs is 51 months. The standard deviation of these lifetimes is 9 months. Ninety bulbs are selected at random, and their mean lifetime is found to be 53 months.
Determine a 95% confidence interval for the population mean.
Suppose that we are interested in the proportion of the 70 students in the lunchroom cafeteria that smokes. Is the normal approximation for the proportion p = r/n valid?
How many students should be surveyed to estimate the mean score within 25 points with 90% confidence?
For certain bird species, wiith appropriate assumptions, the number of nests escaping predation has a binomial distribution. Suppose the probability of success (that is, a nest's escaping predation is .3. Find the probability that at least half of..
Create a research question for which the appropriate test of the statistical hypothesis would require the use of a z-score.
What sample size should be chosen so that there is 0.95 probability of estimating the mean monthly income in $150 or less?
Duracell Ltd claim that the life of their batteries in motorised soft toys is approximately normally distributed with a mean of 102.9 hours and a standard deviation of 16.5 hours.
Use the given confidence level and sample data to find a confidence interval for estimating the population mean
The company statistician has reported the mean number of man-hours lost per month but did not keep a record of the total sum. Should the manager order the study repeated to obtain the desired information? Explain your answer clearly.
The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures the motivation, attitude, and study habits of college students.
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