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A large airline wants to estimate its average number of unoccupied seats per flight over the past year. To accomplish this, the records of 30 flights are randomly selected and the number of unoccupied seats is noted for each of the sampled flights. The data is tabulated below.
8 18 13 11 22 14
9 18 10 18 13 15
7 16 11 10 20 19
13 16 19 18 22 23
6 15 11 12 18 12
Give a 90% confidence interval for the average number of empty seats. Use the sample standard deviation rounded to 3 decimal places. Put your answers in (a, b) form with parentheses and space after the comma required. Round your answers to two decimal places!
Suppose the first credit union to offer free checking is the 10th selected. Is there any evidence to suggest that the claim (72%) is false? Justify your answer.
a drug tester claims that a drug cures a rare skin disease 77 of the time. the claim is checked by testing the drug on
The file Danish Coffee contains data on individual coffee consumption (in kg) for 144 randomly selected Danish coffee drinkers.
What is the smallest sample size for which probability calculations regarding a particular birthday can rely on normal approximations?
Is Paul tall? According to the National Center for Health Statistics, the distribution of heights for 15-year-old males has a mean of 170 centimeters (cm).
Suppose, instead, that we continue calling each number, perhaps in the morning or evening, until an adult is contacted and interviewed.
For a sample of 35 items from a population for which the standard deviation is σ = 20.5 the sample mean is 458.0. At the 0.05 level of significance, test H0:μ=450 versus H1 : μ ≠ 450. Determine and interpret the p-value for the test.
Blood pressure Larry came home very excited after a visit to his doctor. He announced proudly to his wife, "My doctor says my blood pressure is at the 90th.
Find out sample correlation coefficients of (I) age with dry weight, and (2) age with log 10 dry weight. Interpret your results.
business firm makes and sells a steel product. product costs 5 to produce. product sells for 20. product requires 4
A steel ball weighing 128 pounds (mass= 4 slugs) is suspended from a spring. This stretches the spring 128/485 feet. The ball is started in motion from the equilibrium position with a downward velocity of 9 feet per second.
From the histogram, would you expect the mean or median to be larger? Explain.- Write a few sentences describing this distribution (shape, center, spread, unusual features).
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