Stats Help for College-level Students

new: Statistical analysis problem

A survey of the opinions of property owners about a street widening project was taken to determine whether the resulting opinion was related to the distance of front footage. A randomly selected sample of 100 property owners was contacted and the results are shown below: Front-Footage -- Under 45 feet: 12 (for) 4 (un ...continues

z test

An Ice Cream manufacturer wants to know if their claim of 64 oz. per each half gallon container is any less than 64 oz. 1) How would you set up the hypotheses? One or Two tailed test? If one tailed, upper or lower? 2) With 30 samples, alpha at 0.05, a standard deviation at 0.3, and a mean of 63.98, perform the z-test. ...continues

Expected frequency

A survey of the opinions of property owners about a street widening project was taken to determine whether the resulting opinion was related to the distance of front footage. A randomly selected sample of 100 property owners was contacted and the results are shown below: Front-Footage -- Under 45 feet: 12 (for) 4 (undecided) 4 ( ...continues

regression

When we carry out a regression, we assume a direct causal relationship. In a correlation analysis, we don't make such an assumption, but nevertheless determine whether 2 variables are related. Briefly explain how two variables can be correlated without one directly influencing the other (=without causal relationship)

Regression Analysis

a). Make scatter plots (using excel) of salary versus years of service for the entire faculty. Do you think that there is a linear relationship between the two variables? Why or why not? b). Find the simple linear regression model with salary as the dependent variable and years of service as the independent variable. c). ...continues

Time Series and Forecasting

a). Predict the average price of bread for the next 3 months (time = 205,206,207). b). Test the significance of the slope for this model. c). Is the graph consistent with the results of your hypothesis test? Explain why or why not.

Analysis of qualitative data

a). Based on the data, do you think that the respondents are uniformly distributed over the age categories? b). Set up the hypotheses to test whether the data are uniformly distributed over the age categories. c). Find the expected frequency distribution and perform the chi-square goodness of fit test. d). At the 0. ...continues

Regression: Multiple Choice Questions

Which one of the following statements concerning the regression line is true? a. There is a positive linear relationship between the two variables. b. The slope is greater that 1. c. The intercept is at or near 30. d. Vehicles with larger wheelbases have the worst fuel economy. The slope of the regression line, b1, is at ...continues

linear regression

A linear regression between Y and X produced the following equation for the least squares line: = -4.13 + 2.1x Which of the following statements concerning this relationship is true? a.For every one-unit increase in X, Y increases 4.13 units. b.For every one-unit increase in X, Y decreases 2.1 units. c.For ever ...continues

Regression

a). Create a scatter plot (using excel) of the data. b). Find the equation of the linear regression line. c). Plot the regression line on the same plot as the data. d). How well do you think the line fits the data? e). Use the regression equation to predict the number of officers hired for each city. f). Calculate ...continues