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Learning math through subliminal messages. A "subliminal" message is below our threshold of awareness but may nonetheless influence us. Can subliminal messages help students learn math? A group of students who had failed the mathematics part of the City University of New York Skills Assessment Test agreed to participate in a study to find out. All received a daily subliminal message, flashed on a screen too rapidly to be consciously read. The treatment group of 10 students was exposed to "Each day I am getting better in math." The control group of 8 students was exposed to a neutral message, "People are walking on the street." All students participated in a summer program designed to raise their math skills, and all took the assessment test again at the end of the program. Here are data on the subjects' scores before and after the program:
(a) The study design was a randomized comparative experiment. Outline this design
(b) Compare the gain in scores in the two groups, using a graph and numerical descriptions. Does it appear that the treatment group's scores rose more than the scores for the control group?
(c) Apply the Wilcoxon rank sum test to the posttest versus pretest differences. Note that there are some ties. What do you conclude?
Two tanks A and B, each of volume V, are filled with water at time t=0. For t > 0, volume v of solution containing mass m of solute flows into tank A per second; mixture flows from tank A to tank B at the same rate and mixture flows away from tank..
The manager of Petroco service station wants to forecast the demand for unleaded gasoline next month so that the proper number of gallons can be ordered from the distributor.
Why does the sample size play such an important role in reducing the standard error of the mean? What are the implications of increasing the sample size?
Illustrate what amount of sales would be required to be a super savings club member. Elucidate amount of sales would be required to be a gold club status.
What is the natural model for design and how many d.f. are there for each term in the model - design while the design was still being created.)
Consider a dipole of strength D, oriented along the x-axis and located at the point x = ε/2, y = 0, z = 0, and a dipole of strength -D, oriented along the x-axis at the point x = - ε /2, y = 0, z = 0. Write the expression for the potential for thes..
Explain five steps used in hypothesis testing. Be specific, using numerical examples as well as symbols and verbal explanations.
The manager of a local bank wants to estimate the average amount held in checking accounts by the customers. A random sample of 30 customers is selected, and the results indicate a sample average of $4,750 and a sample standard deviation of $1,200..
let us suppose that sat mathematics satm scores in the absence of coaching vary normally with mean 515 and ? 100.
Both parties agree that if the average score in this year's survey is greater than one hundred and eight they will increase the police force. Is this decision rule adequate? What is the Type 1 error of this rule?
question problem statement areathe charlevoix seismic zone csz is the most seismically strive region of eastern
Make a scatterplot of the data. Find the equation of the least-squares regression line for predicting BAC from number of beers and add this line to your plot. Briefly summarize what your data analysis shows.
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