Stats Help for College-level Students

Using a regression equation to calculate the correlation coefficient. Attachment in Word.

The owner of an office building studies heating cost versus daily high temperatures. He records the following data: Temperature (deg C) @ Cost ($100) ------------------------------- 1 @ 9 4 @ 5 6 @ 3 10 @ 2 He proposes a regression equation to predict the cost of heating the building. Wh ...continues

Calculating the standard deviation of a given data set. Attachments in Word.

At the end of the season, the number of wins in a softball league for each of the eight teams is: {10, 9, 5, 4, 4, 3, 3, 2) What is the standard deviation of wins?

Problems with Using the Excel Solver- Kak Industries

I just need help with the calculations as I am new with Excel Solver, and I am having problems formulating. For the LP problems, you will need to solve using the Excel Solver. We have used the Sum Product feature when using Excel. So in cases where you can use that, please do so.

Proportion of the population

Suppose the President wants an estimate of the proportion of the population who support his current policy toward gun control. The President wants the estimate to be within 0.04 of the true proportion. Assume a 95% level of confidence. The President's political advisors estimated the proportion supporting the current policy t ...continues

Finding confidence interval for beta

Given this set of data: (x,y): (-9,10.5), (-7,18.5), (-5,22.6), (-3,27.2), (-1,31.2), (1,33), (3,44.9), (5, 49.4), (7,35), (9,27.6) Find a 90% confidence interval for beta 2(B2) [note: this deals with the model y=B0+B1X+B2X^2+e, e is the error, e~N(0, o~^2) (where o~ is sigma, the variance)] Is there evidence of a quadratic ...continues

Proving Neyman-Pearson Lemma

Prove the Neyman-Pearson Lemma.

Statistics Question - Calculating Probabilities

A manufacturer has two plants that produce the same product...Plant A and Plant B...Plant A has 60% of the total production and has a 5% defective rate...Plant B has 40% of the total production with a 7.5% defective rate... 1. What is the total defect rate? I came up with 6%...???? 2. A randomly selected product was defec ...continues

Multiple Regression

Is an interaction term in multiple regression is combining two variables. How would you use an interaction term in multiple regression?

HETEROSKEDASTICITY

I am attaching three different residual plots. I am trying to determine whether heteroskedasticity is present. I don't believe I see any pattern indicative of heteroskedasticity (nonconstant variance). I know it can be difficult to detect - do you see any indication of this?

Applying Statistical Tests

I would like to compare data from a study I have been doing, but don't know which statistical tests to use. I have surveyed 40 hedgerows: 20 from site 1 20 from site 2 I have attached some of the data to show you at what stage I'm at: 1). I need to find out the significance of difference between the 2 sites in terms of ...continues