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After the presidential debates, a random sample of 1200 voters showed that 540 favored the Democratic candidate; 480 were in favor of the Republican candidate; 40 were in favor of the Independent candidate, and 140 were undecided. At a 1% level of significance, test to see if the proportion of voters has changed.
Calculate the value of the Chi-Square Test Statistic for this problem. What is it?
Following sample data shows the weekly closing price of ABC stock. Compute the sample mean and variance from this data set.
First-order regression model was fit to data. Part of printout follows?
Create a 95% confidence interval for proportion of highly educated women who left careers for family reasons and who wish to return to work.
At the .05 significance level, can we conclude that there is a difference in their mean times?
The instructor wanted to "pass" anyone who scored above 69. What proportion of exams will have passing scores?
Perform hypothesis testing on one variable's data.
Draw the graph of the regression line on the same plot as the scatter diagram above.
The price of XYZ Corporation stock is normally distributed all through the year with mean of $42.00 per share and a standard deviation of $2.25 per share. Suppose that the stock is traded 240 days out of the year.
Construct a 95% confidence interval estimate for the average waiting time of all the patients who visit this doctor. Assume the population of waiting times is normally distributed.
Fair die is rolled 10 times. Determine the probability that the odd number (1, 3 or 5) will occur less than 4 times?
A game involving a pair of dice pays you 3 with probability 17/36, costs you 2 with probability 14/36, and costs you 4 with probability 5/36. What is your probability of losing money in one play of the game?
Carryout the ANOVA and, if essential, post-hoc comparisons. Conduct a graph to represent group differences, and interpret ANOVA in a paragraph written in APA style.
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