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Question: In 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 .614 min. Give a 95% confidence interval for the difference in bleeding times. Do you think pressure increases mean bleeding time? Why?
Vehicles heading west on Front Street may turn right, left or go straight ahead at elm street. The city traffic engineer believes that half to the vehicles will continue straight through the intersection.
Undercover officers and marital stress. Love, Vinson, Tolsma, and Kaufmann (2008) studied the psychological effects of being an undercover officer.
Although the phenomnenon is not well understood, it appears that people born during the winter months are slightly more likely to develop schizophrenia than people born at other times.
What are differences between dependent and independent samples? Provide examples. What are the implications for determining the tests used to analyze data?
Review the tables located in the Excel sheet attached.Choose one table that has not already been selected by another classmate.
Find the given probabilities for X = pulse rates of women, for which the mean is 75 and the standard deviation is 8. Assume a normal distribution.
Montarello and Martens (2005) found that fifth-grade students completed more mathematics problems correctly when simple problems were mixed in with their regular math assignments.
Recently, three new airlines, MAX jet, L'Avion, and Eos, began operations selling business or first-class-only service. These airlines need to estimate the high
What is the purpose of conducting an experiment? How does an experimental design accomplish its purpose and what are the advantages and disadvantages of an experimental design in an educational study?
a certain zoo is know to collect unusual animals from different animal groups. one ostrich specimen in the zoo weighs
A high school teacher correlated the math test scores and scores on a motivation scale for her 9th graders. She was delighted to find a high correlation between the two sets of scores. Later in the semester she correlated the math test scores of ..
1. Cards are drawn one at a time, without replacement, from a deck of 52 cards until the first club card is obtained. Let X be the number of draws required. (a) Find the mass function of X .
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