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Unoccupied seats on flights mean lost revenue for airlines. A large airline wants to estimate its mean number of unoccupied seats per flight over the last year. The airline takes a random sample of 225 flights and calculates the average number of unoccupied seats to be 11.6 Assume the population standard deviation of unoccupied seats for all flights for this airline is equal to 4.103
a) Find a 90% confidence interval for μ and the mean number of unoccupied seats
b) Suppose the company wants their 90% confidence interval to have a margin of error of no more than 0.25. How large must the sample size be to satisfy this requirement?
What is the stock's value at it's highest on 15 days of the year? (Assume that there are 240 trading days in a year).
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
He estimates that he/she has a 45% chance of success with each customer. What is the probability that he/she will earn his/her bonus today?
The severity of side effects experienced by patients while being treated with a particular medicine is under study. The severity is measured on the scale: none, mild, moderate, severe, very severe.
Determine the mean and standard deviation of the data. What percentage of the data lies within one standard deviation of the mean value?
Assume X is an exponential random variable with parameter lambda. Find the method of moments estimator for lambda.
Process of algebraic division and then solving a quadratic equation, find the complex roots. Write down all the factors of the 4th degree polynomial
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According to a recent survey of 500 randomly selected residents of Popular City, it was found that 38% are in favor of raising city taxes in order to build a new stadium for the local baseball team. (a) What is the population of interest of the su..
The analysis needs to be re-run adding the error into the regression sum of squares.
The 95% confidence interval for the mean of the sampling distribution of the mean is about:
Determine the expected shape of distribution of sample mean? Compute the likelihood of choosing a sample with mean of at least $112,000?
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