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A regional commuter airline selected a random sample of 25 flights and found that the correlation between the number of passengers and the total weight, in pounds, of luggage stored in the luggage compartment is 0.94. Using the .05 significance level, can we conclude that there is a positive association between the two variables?
The linear correlation coefficient, r, measures the strength of the linear relationship the variables in a set of ordered pairs (x,y). What is the maximum and minimum values for r?
Make an interval estimate the population means score for the daycare children so that you are 95% confident that the true mean is in your interval.
The random variable x has a normal distribution with mean=30 and standard deviation=30, find the probability that x assumes a value more than two standard deviations from its mean. more than three standard deviations from the mean.
Population blood pressure (BP) of patients is normally distributed, with a mean of 127, and standard deviation of 8. A random sample of 49 patients in the hospital found an average BP of 125.
Let us speek where the preceding data are representative of the entire sector of retail sales companiesSuppose the annual profits are more than 6.5 thousand $ every employee.
A health care professional wishes to estimate the birth weight of infants. How large a sample must she select if she desires to be 90% confident that the true mean is within 6 ounces of the sample mean?
State the null and alternate hypotheses if you want to determine whether the mean amount spent is higher for men than for women,
The value of the z score in a hypothesis test is influenced by a variety of factors. Assuming that all other variables are held constant explain how the value of z is influenced by each of the following: (a) increasing the difference b/w the sampl..
Find out the expected winnings for a person who buys one ticket.
A population of data from a paper supply company is known to have a mean weight of 55 ounces per ream and a population standard deviation of 5 ounces. The population is known to be bell shaped and symmetrical. Which of the following statements is ..
A hospital human resources manager finds that the local average starting salary for nurses is $24,000. She randomly samples 10 nurse's salaries at the hospital and calculates a mean of $23,450 and a standard deviation of $400.
Critically discuss why the dowload is a continous numerical varaible and critically discuss why the download time is a ratio scaled variable.
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