Stats Help for College-level Students

Moving averages

a). Display this time series using a scatter plot (please use excel). b). Do you notice any patterns?

Time Series Forecasting

a). Display this time series as a line graph (please use excel). b). Find the 4-period MA (moving average) forecast for January 1997. c). Find the MSE (mean square error) for the 4-period MA (mean average) model. See attached file for full problem description.

Analysis of qualitative data

a). Set up the necessary hypotheses to test whether the data come from a binomial distribution with n = 10 and  = 0.80. b). Find the expected frequency distribution for the data. c). A the 0.05 level of significance, is it reasonable to assume that the number of loan applications that are approved in 24 hours has a ...continues

Chi-square test

a). Set up the hypotheses to test whether the proportion of people who rated their company as excellent is the same for each type of company. b). Calculate the overall proportion of people who rate their current phone service as excellent. c). Find the expected frequency for each cell and calculate the chi-square test stat ...continues

Chi-square, frequencies

a). Set up the hypotheses to test whether the number of miles driven by Porsche drivers is normally distributed with a mean of 7500 miles with a standard deviation of 6500 miles. b). Find the expected frequencies for each cell. c). Calculate the chi-square test statistic. If necessary, collapse cells so that the expected ...continues

Z-test

Hypothesis is it takes 25 minutes or less to serve a meal. The sample size was 20 people observed for 80 minutes. The average time it took for all people to be served was 24 minutes.

ANOVA - correlation between data sets and algorithms describing correlation

Neighborhoods of size 1000 were randomly sampled from three different cities (populations): New York, LA, and Washington. The number of crimes occurred in the last five years in each neighborhood were recorded. The average annual income in each neighborhood was also recorded as an index of financial well-being. (The data are att ...continues

Problem with statistical information

I have attached my methodology with statistical information. I used chi square to compare relationships, and I need assistance in the validity of the diagnosis. I believe I did it correctly. Can someone review the information, and let me know if it makes sense. Any recommendations or suggestions are appreciated. Specifically ...continues

what is alpha level and p-level?

You are a brand manager and have been running general TV spots to market your product. Now, you are considering running a series of spots that specifically targets wealthy consumers. The spots will cost $2K out of your $100K advertising budget. You estimate the market potential for wealthy consumers to be $250K. You hire a m ...continues

decision tree? probability?

NewSource Inc. uses natural gas in its production-processing operations. Neighboring companies in its upstate Ohio area have successfully drilled for gas on their premises, and NewSource is considering following suit. Their initial expenditure would be drilling, which would cost $80,000. If they strike gas, they would have to ...continues