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You are curious about whether or not eating too much of a good thing will decrease a person's preference for that type of food. You ask 12 people how much they like pizza on a scale from 1 to 7, where 7 is highly enjoyable and 1 is not enjoyable. Then, you make them eat a pizza for dinner every day for two weeks. After that, you ask them how much they like pizza.
#Before the study, you observe the values:
# 7 7 3 1 6 5 4 3 3 4 6 7
#After the study, you observe the values:
# 2 1 4 4 1 1 2 1 6 4 5 4
#1) Are the groups independent? Examine the means and SDs for each of the groups
#2) Use the appropriate t-test to test the null hypothesis that mean score for before=after. Do you reject or fail to reject the null?
A sample of participants took part in a hearing experiment. Among other things, the absolute hearing threshold (in decibels) wasmeasured for each participant. The measurements were as follows:
National data show that, on average, college freshman spend 7.5 hours a week going to parties. President DeRosa doesn't believe that these figures apply at his school; he thinks freshman at his school party less.
What is the ANOVA test used for and what are its variants of use? When is the one-way ANOVA test used?
The reliabilities of the components are 0.96, 0.91, and 0.80. What is the probability that the device will work when needed?
What is the difference between statistical significance and practical significance? Can a hypothesis test result be statistically significant and yet practically useless.
The half-width B desired could be anywhere from 2 to 7. Tabulate the minimum sample size needed for the given ranges of sigma and B.
What are some challenges that local law enforcement officers face? What do law enforcement officers need to combat computer crimes at the state and local levels?
Do you agree or disagree? Explain your answer and include supporting references.
Is it possible to have no (or very small) collinearity and correlation between variables, yet have the same R squared and Adjusted R squared values?
No promises made under duress are enforceable contracts. Therefore, no unenforceable contracts are promises made in the absence of duress.
Find the expected value and variance of S = X + Y + Z and find the expected value and variance of A = (1/3)(X + Y + Z).
How would I determine and interpret a 99?% confidence interval for the mean amount of time Americans age 15 or older spend eating and drinking each day.
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