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Peak expiratory flow (PEF) is a measure of a patientÕs ability to expel air from the lungs. Patients with asthma or other respiratory conditions often have restricted PEF. The mean PEF for children free of asthma is 306. An investigator wants to test whether children with chronic bronchitis have restricted PEF. A sample of 40 children with chronic bronchitis are studied and their mean PEF is 279 with a standard deviation of 71. Is there statistical evidence of a lower mean PEF in children with chronic bronchitis? Run the appropriate test at ?=0.05.
When would we reject HO?
a. When the answer = 0
b. If the alternative hypothesis is greater
c. If Z = 1.645
d. If Z is < or = -1.645
The diameters of ball bearings are distributed normally. The mean diameter is 74 millimeters and the variance is 16. Find the probability that the diameter of a selected bearing is less than 78 millimeters.
For certain bird species, wiith appropriate assumptions, the number of nests escaping predation has a binomial distribution. Suppose the probability of success (that is, a nest's escaping predation is .3. Find the probability that at least half of..
Explain the strength of relationship between the assets?
Their average cost was $405 with a standard deviation of $80. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
Research hypothesis: Turnout tends to be higher in proportional representation electoral systems and research hypothesis: A country's predominant religion influences its democratic status today
some sales representatives want to determine which approach would result in more sales for a manufacturing product. the
a sample of 60 students from a large university is taken. the average age in the sample was 22 years with a standard
You are dealt 2 cards from a shuffled deck of 52 cards, without replacement. There are four suits of 13 cards each in a deck of cards
scores on the sat mathematics test are believed to be normally distributed with mean micro. the scores of a random
The combined SAT scores of students are normall distributed with a mean of 950 and a standard deviation of 200. What are the minimum and the mximum values of the middle 87.4% of the scores.
a little confused on this one.assume the probability of a household owning a blue-ray player is 0.70.what is the
Identify a research question from your professional life, research interests, or everyday experience that could be addressed by this analysis.
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