Stats Help for College-level Students

Estimation Theory, unbiased estimate

Obtain the unbiased estimates of the population mean and population variance from which the following sample is drawn: 19.30,19.61,18.27,18.90,19.14,19.90,18.76,19.10

Assistance with Chi square

I need assistance developing a statistical method to interpret the data in the chart.My thesis topic is Can affirmative action protects the rights of minorities and females in employment. I am using an affirmative action plan to compare the relationship between female as minorites vs. non minorities. The availability estimate is ...continues

Bayesian statistics and "regular" statistics

What is the difference between Bayesian statistics and "regular" statistics?

Correlation

In the scenario below, this is an application of regression and correlation analysis. We have years of service and salary range. Which is the independent variable and which is the dependent variable? How do you tell the difference?

Pearson's Correlation and Spearman's Rank Order Correlation

Compare and contrast Pearson's Correlation and Spearman's Rank Order Correlation?

General stats problem

Question 1 (30 pts.): The Excel file attendance.xls contains the daily attendance data at a theme park for a period of four weeks in summer. The park manager wants to use these data to make forecasts for the following summer week. a) Make a time-series plot of the data. Is there a trend? Is there seasonality in the data? Wha ...continues

General stats problem

Question 2 (15 pts.): An automaker tests the accuracy of speedometers purchased from a vendor on a weekly basis. The test plan calls for testing a random sample of 25 speedometers at a nominal speed of 55 mph. A statistically significant deviation at 1% significance level from the nominal value results in rejection of the lot su ...continues

General stats question

Question 3 (35 Points): The director of quality at a large HMO wants to evaluate the patient waiting times at a local facility. She wants to estimate the mean waiting time within a margin of error of 5 minutes using a 95% confidence interval. An a priori guess of the range of waiting times is 0 to 60 minutes. a) For an a pri ...continues

General stats problem

Question 4 (20 Points): A marketing survey is to be planned to estimate the proportion of all customers who would subscribe to a new pay-per-view service that a cable TV plans to offer. The sample size for the survey is to be decided to estimate this proportion within a margin of error 2 percentage of points using a 95% confiden ...continues

ANOVA

A study of crime rates was recently taken in three cities in the United States. 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 neigh ...continues