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Linear regression analysis; construct confidence intervals for regression parameters; correlation coefficient .
We can use two products at my work, which are mutual funds and see if there is a correlation between the two. The two different funds are: a domestic stock mutual fund, which only invests in large organizations (large cap companies) based here in the US and an international mutual fund, which only invests in large foreign-based companies. We can see the relationships between them and the magnitude of those relationships.
Date: USIFX Monthly 2006 USSPX Monthly 2006Close Close
Dec 1 27 21.24
Nov 1 28.91 21.05
Oct 2 28.1 20.66
Sept 1 27.54 20.01
Aug 1 27.49 19.59
Jul 3 26.57 19.14
Jun 1 26.01 19.03
May 1 25.84 19.09
Apr 3 26.79 19.65
Mar 1 25.63 19.40
Feb 1 24.90 19.24
Jan 3 24.95 19.19
Employ the frequency distribution, which describes the response of a survey of college students when asked, "How often do you wear a seat belt when riding in a car driven by someone else?"
The diameters of oranges in the certain orchard are normally distributed with the mean of 5.26 inches and a standard deviation of 0.50 inches.
Fit a linear regression model for bp against sodium. Do you think this is a model with a good fit? Why?
A researcher is interested in whether social assertiveness might be influenced by training procedures. Two groups of college sophomores are randomly selected. Group A subjects are assigned to the "training sessions" and Group B subjects do not rec..
Construct a 95% confidence interval for the proportion of people disagreeing with the statement.
You wish to do a community needs assessment survey of a community to find out how much office space is needed by professionals in the community.
A standard IQ test has mean of 98 and a standard deviation of 16. We want to be 99% certain that we are 8 IQ points of the true mean. Determine the sample size.
What is the probability that the drug will be effective for 2 hours or less?
Let p represent the proportion of registered voters in the state that would vote for the Republican candidate. The standard error for the proportion of those who phoned in who answered "yes" is
Determine the probability that person's monthly gasoline (gallon) purchases will be less than 67 gallons.
A small town has a population of 20,000 people. Among these 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
Suppose normality, determine a 90% confidence interval for population variance.
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