Stats Help for College-level Students

Statistics Question: Spearman Rank Correlation Coefficient

Six employees of a grocery store were ranked by customers and their supervisor. At the .05 level find the Spearman rank correlation coefficient. Employee A B C D E F Customer rank 5 2 1 4 3 6 Supervisor rank 3 4 1 5 2 6 a. 0.60 b. 0.71 c. 0.85 d. 0.26

Statistics Question

What is the technique called that uses random numbers and probabilities to represent real life situations? a. stratified b. sampling c. simulation d. systematic

Intro to Statistics Question

which of the following is not an advantage of using a cluster sample instead of other typers of samples? a. it can reduce cost b. it is convenient to use c. it can simplify field work d. the groups of people tend to be more homogeneous

Statistics Question

A researcher divided up his population into five groups: Northeast, Southeast, Midwest, Southwest, and Northwest. What is this type of sampling technique called? a. random sampling b. stratified sampling c. systematic sampling d. cluster sampling

Statistics Question

Numbering all the items and then drawing numbers from a hat to determine which ones to test would be called what? a. random sampling b. stratified sampling c. systematic sampling d. cluster sampling

Bayesian Reliability Analysis

How do I derive the posterior density of a Weibull Distribution?

Properties of Expected Values

Properties of Expected Values. Attached is a Adobe pdf file. I am studying for a test and wish to use this problem as a guide. Please give as much detail as possible so that I may understand the concept Thank you much in advance.

Random Variables - The Variance

Random Variables - The Variance. Attached is a Adobe pdf file. I am studying for a test and this is another problem that I will be using as a guide. Please give as much detail as possible so that I may understand the concept. It is a three part problem.

probability function

A standard die has its faces painted different colors. Faces3,4,6 are red, faces 2 and 5 are black and face 1 is white. a) Find the probability that when the die is rolled, a black or even numbered face shows uppermost. a game is played by rolling the die onvce. If any of the red faces show uppermost, the player wins the ...continues

Poisson vs. Gaussian distribution

Radiation: The atoms of a radioactive element are randomly disintegrating and emitting alpha particles. The number of alpha particles emitted per second from these atoms during a 30 second period is recorded as follows. 9.38 8.08 8.36 10.44 9.44 8.05 17.78 7.56 14.17 6.73 9.81 4.79 11.98 9.48 6.32 14. ...continues