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In given Problem, use the standard deviations for bleeding times calculated from 43 bleeding times without pressure and from 39 bleeding times under pressure to decide whether bleeding time under pressure is more variable than bleeding time without pressure
Problem 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?
suppose you record data on these five variables for every student in your class place of residence dorm apartment with
a pipe diffuser consists of a diverging section of pipe . the diffuser is located in the horizontal plane. the diffuser
You are the designer for your company's web site. You have data to indicate that the mean download time for the homepage is 5.8 seconds and that the standard deviation of download time is 2.1 seconds.
to test the significance of an individual regression coefficient we would conduct a and look for p-values smaller than
Let An be an increasing sequence of σ-algebras whose union generates a σ-algebra S. Let µ and ν be probability measures on S such that ν is singular with respect to µ on S, but absolutely continuous with respect to µ on each
Consider the experiment of tossing a fair coin three times and observing the number of heads that result (X = number of heads).
The president of Doerman Distributors, Inc., believes that 30% of the firm's orders come from first-time customers. A random sample of 100 orders will be used to estimate the proportion of first-time customers. Assume that the president is correct..
Which of the following is the correct set of probabilities for X and if a student is selected at random, the probability he or she is either a Junior or a Senior
two dice are tossed. let x be the smaller number of points. let y be the larger number of points. if both dice show the
1. signatures to a petition were collected on 676 sheets. each sheet has enough space for 42 signatures but on many
She asked her assistant for a 95% confidence interval, approximately how large a sample did her assistant use to determine the interval estimate?
on completing this chapter you should be able to correctly answer the following questions.a. true or false it is
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