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To study whether or not pressure exerted on the upper arm increases bleeding time, 39 persons had their upper arm subjected to a pressure of 40 mmHg of mercury and their fingers pricked.
Their mean bleeding time was 2.192 min, and the standard deviation of their bleeding times was .765 min. Forty-three other persons acted as controls. No pressure was used for the controls, and their bleeding time was found to have a mean of 1.524 minutes and a standard deviation of .614min.
Give a 95% confidence interval for the difference in bleeding times. Do you think pressure increases mean bleeding time? Why?
What is the probability trading volume will be less than 400 million shares?
a california university is investigating expanding its evening programs. it wants to target people between 25 and 55
In a sample of 59 business trips taken by employees in the HR department, a company finds that the average amount spent for the trips was $1,495 with a standard deviation of $458.
Expalin what would be the appropriate statistical procedure to test the following hypothesis: Triglyceride values are a good predictor of weight in obese adults.
Critically discuss some reasons that business outputs vary? For example why does production output vary? Explain the difference between common causes of variation and special causes of variation.
Assuming that his list represents a simple random sample of those persons who could be called, what is the probability that Albert will meet or exceed his quota?
The following problem develop the concept of determining the probability distribution of random variable and its mean and variance.
Find the mean and median of the transformed heights and convert the mean and median of the transformed data back to the original units.
According to their estimates, are the two tournaments independent? Explain your answer. What's the probability that he loses both tournaments?
An overnight express company must include seven cities on its route. How many different routes are possible, assuming that it matters in which order the cities are included in the routing?
What is the coefficient of x^5 in the polynomial -8x^5+0x^3+14? Find the slope of the line that contains points (-4,-2) and (1,1)
Use MINITAB to compute power and sample size for an upper-tailed, one sample z-test, with σ = 4, designed to detect a difference of 2, at the signi?cance level of α = 0.05: (1) if n = 25, determine the resulting power;
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