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Unoccupied seats on flights cause airlines to lose revenue. It is known from past experience that the standard deviation is 3.2 unoccupied seats. Suppose a large airline wants to estimate the average number of unoccupied seats per flight. Records of 50 flights were randomly selected from the files, and the number of unoccupied seats was noted for each of the sampled flights. The sample mean was 8.4 seats. Suppose a 90% interval estimate for the average number of unoccupied seats was calculated? How large should the sample have been if a margin of error of 0.25 seats was desired?
This morning the office you are monitoring has eight office visits on the schedule. What is the probability that
Suppose a machine is worth 33000 after 4 years and 18000 after 8. Find the rate of depreciation using the linear depreciation method
Salaries upon graduating than are graduates of other programs. Describe a statistical experiment that could help test your belief.
Test this conjecture with formal hypothesis test, by using a 5% significance level. Find out the p-value for hypothesis test.
Construct the 90% confidence interval for the true population proportion of all voters in the state who favor approval.
Information about Solving inequality-X^2-1.01x-83.19
How does multilinear regression analysis apply to a profession? Specify the dependent value and the set of predictors. Where would you get the data?
Estimated proportion is within 2.5 percentage points of the true proportion. A previous poll suggests that the proportion is 85%. How large must your sample be?
A researcher studies the relationship between political attitudes and income. He/she finds that those with higher income are more conservative.
The mean of land and buildings per acre from a sample of farms was $637, with a standard deviation of 26. Use Empirical Rule to find approximate percentage of acreage whose values were between $ 661 and $663.
What is the probability of this project being completed earlier than 19 days?
A grab bag contains 10 $1 prizes, 7 $5 prizes, and 3 $20 prizes. three are chosen at random. find the probability that exactly two $20 prizes are chosen?
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