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A regression was run to determine if there is a relationship between hours of TV watched per day (x) and number of sit-ups a person can do (y).
The results of the regression were:
y=ax+ba=-0.985b=39.064r2=0.6241r=-0.79
Use this to predict the number of sit-ups a person who watches 10.5 hours of TV can do (to one decimal place)
Weekly rates of return (on an annualized basis) for certain securities over a given period are believed to be normally distributed with mean 8.00% and variance 0.25. Give two values x1 and x2 such that you are 95% sure that annualized weekly return..
Describe the process for finding probabilities using z-scores and the standard normal distribution.
show that in mlreg multiple linear regression the residual vector e is orthogonal to both the design matrix x and the
What is the difference between a sample and a population? When can the same information (e.g. the age of each of the ten students in our class) be considered both sample data and population data?
1. Identify and define the problem (and include literature review summary) 2. Determine set of alternative solutions 3. Determine criteria to be utilized to evaluate alternatives 4. Evaluate Alternatives
What type of test is needed to analyze the data? What is the hypotheses (including the symbols used to state the hypothesis)?
Discuss the issue being addressed, how the data were collected, the results of the statistical test, and any conclusions drawn based on the analysis.
Test the claim that there is difference in the mean ages of the two groups. Use a = 0.01.
If you want to provide a warranty so that only 2% of CD player will be replaced before the warranty expires, what is the time length of the warranty? c) What is p67?
We cannot say because the condition for randomness, independence, or normality is not met.
question researchers asked a sample of 50 1st grade teachers and a sample of 50 12th grade teachers how much of their
a system with 3 components is such that the system fails if at least one of the individual components fail.the
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