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1. What is the null hypothesis in a chi-squared test of independence?
2. How many 'tails' can a chi-squared test have, one or two?
3. In a regression analysis, what do the residuals from the fitted line add up to?
4. List the assumptions under which the linear regression model is supposed to work.
5. What is the interpretation of the coefficient of determination? Between what values can it vary?
The following study was developed by Economist Simon Fass. Fass surveyed a sample population of low-income households in St. Martin. The variables analyzed were monthly income per adult and choice of rental contract for housing.
A researcher wants to estimate the average time (in minutes) spent in a car daily. This will be done by randomly surveying 300 individuals and calculating the sample mean.
Your mayor just announced that the local unemployment rate dropped last month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop? Explain.
If you did not know anything about standard deviation of population from which sample was taken, find out the 95% confidence interval for mean test score.
A biased coin with probability of head being .6 is tossed 12 times. What is the probability that number of head would more than 4 but less than or equal to 10.
Dertermine the probability that a male is a Major or a Colonel?
The mean difference in total cholesterol levels (after - before) was 27.138 mg/dL with a standard deviation of 7.3685 mg/dL. Create a 95% confidence interval for the true average difference in cholesterol levels by the drug.
In general, determine the standard score a measure of?
What is the predicted GPA if a person watches 12 hours of television per week?
The main part of the ACS contacts 250,000 addresses by mail each month, with follow-up by phone and in person if there is no response. Each household answers questions about their housing, economic, and social status. What is the Population.
The number of degrees of freedom for the appropriate chi-square distribution in a test of independence is:
At α = 0.10 test the claim that there is a difference in means of the salaries. (a) State the Hypotheses: (b) Compute the Test statistic: (Round off correctly)
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