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Can pleasant aromas help a student learn better? Hirsch and Johnston, of the Smell & Taste Treatment and Research Foundation, believe that the presence of a floral scent can improve a person's learning ability in certain situations. In their experiment, 22 people worked through a set of two pencil and paper mazes six times, three times while wearing a floral-scented mask and three times wearing an unscented mask. Individuals were randomly assigned to wear the floral mask on either their first three tries or their last three tries. Participants put on their masks one minute before starting the first trial in each group to minimize any distracting effect. Subjects recorded whether they found the scent inherently positive, inherently negative, or if they were indifferent to it. Testers measured the length of time it took subjects to complete each of the six trials. The data are available in the scent data set.
a) Make a list of questions one might like to ask about this situation and for which the data collected provide some information.
b) For which of these questions do we know a statistical method?
c) Perform an analysis to answer one of the questions identified in b).
A is the set of positive divisors of 24, that is A= {1,2,3,4,6,8,12,24}, and the relation R is dividing. If B is the set of positive divisors of 24 except 1, what is the minimal element(s)? smallest element? maximal element(s)? largest element of ..
hand-calculate the sample size that will be required to detect an increase or decrease of 1.5sigma from the mean of one
Finding probability for the given values of the uniform density curve
Suppose that a calculus student is randomly selected to accompany the math teachers to a conference. What is the probability that the student is a junior?
A firm will promote two employees out of a group of six men and three women. list the chances of this experiment if there is particular concern about gender equity.
Organised and implemented tasks required to achieve required outcomes, with an awareness of how the outcomes contribute to the organisation's goals
An estimate of the standard deviation of the proportion of carbon monoxide is 0.25. Find a variable sampling plan and explain its operation.
given the linear correlation coefficient r and the sample size n determine the critical values of r and use your
Which variable(s) in the data set are measured using a nominal scale? Which variable(s) in the data set are measured using an ordinal scale?
What is the Variance, Standard Deviation and Range of the following set of scores? 20,24,26,22,18,16,18 and then 10,15,12,18,19,16,12
The historical average lifetime for cartridges produced by the current process is 1502.5 pages. At α = .05, test the claim that the new cartridge has a longer lifetime.
Which of the following represents a suitable lag compensator that achieves a steady-state error less than 10% for a ramp input and a damping ratio of the closed loop system dominant roots of ζ ≈ 0.707,
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