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Hypothesis testing and confidence interval for two proportions:
For a certain ballot issue, many county voters feel that the proposal will pass because of the large proportion of the city voters who favor the issue.
a) If 120 of 200 town voters favor the issue and 240 of 500 county voters favor the issue, would you agree that the proportion of town voters favoring the issue is higher than the proportion of county voters favoring the issue? Use a 0.025 level of significance.
b) Establish a 99% Confidence interval about the difference in the proportion of the town voters and county voters who favor the proposal.
Hint: Assume p1= the true proportion of town voters who favor the issue and p2 = the true proportion of county voters who favor the issue.
If you have multiple regression output with 2 independent variables and R-Square is .9682, what does R-Square indicate?
Carry out F test for significance of straight line regression of Y on X and interpret your results.
Data in table represent number of consumer complaints against major U.S. airlines. If one complaint from table is arbitrarily chosen, determine the probability that it was filed against United Airlines.
Sampling variability refers to the idea that different samples will include different individuals
The main purpose of this exercise is to check your understanding of significance level, p-values and power .
What are the possible combinations of coins that Sanjay could have received in change?
An ANOVA procedure is used for data that was obtained from four sample groups each comprised of five observations. The degrees of freedom for the critical value of F are:
A chance sample of 50 families revealed an average or median of $112,000 and a standard deviation of $40,000. What is the standard error of the average or median?
We want to estimate the population mean within 5, with a 99% confidence level. The population std dev is estimated to be 15. How large is the required sample size?
Determine a 95% confidence interval for the population mean.
What percent of the Fords traveled 62.000 miles or less during the year?
Heights of 18-year-old men are approximately normally distributed, with mean 68 inches and standard deviation 3 inches.
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