Stats Help for College-level Students

Random Variables- Properties of Variance/Standard Deviation

A mason is contracted to build a patio retaining wall. Plans call for the base of the wall to be a row of 50 10-inch bricks, each separated by ½ inch thick mortar. Suppose that the bricks used are randomly chosen from a population of bricks whose mean length is 10 inches and whose standard deviation is 1/32 inch. Also suppose ...continues

probability

Samples of size 49 are drawn from a population with a mean of 36 and a standard deviation of 15. What is the probability that the sample mean is less than 33?

Hypothesis: Alpha Understanding

Background:The Waterhole bar & grill decided to run a special offer of a free fried zucchini appetizer with the purchase of a pitcher of beer & a sandwich for Monday nights only during the height of the baseball season. A loyal customer who loves baseball and grows vegetables agreed to supply the squash free. Management's object ...continues

ANOVA, Kruskal-Wallis, and T-Test Statisitc

I'm having difficulty understanding and showing in layman terms or simple terms an example and comparison between the ANOVA test, Kruskal-Wallis test, and T-Test Statisitc.

Hypothesis Testing

A well known doctor hypothesized that 75% of women wear shoes that are too small. A study of 356 women by the American Orthopedic Foot and Ankle Society found 313 women wore shoes that were at least one size too small. Test Null Hypothesis (Ho): p=.75 and alternative hypothesis (Ha): p does not = .75 at .01 level of significanc ...continues

hypothesis Testing

A Federal funding program is availible to low income neighborhoods. To quailify for the funding a neighborhood must have a mean household income of less then $15,000 per year. Neighborhoods with mean household income of $15,000 or more do not qualify. Funding decisions are based on a sample of residents in the neighborhood. A hy ...continues

Hypothesis Testing

A bath soap manufacturing process is designed to produce a mean of 120 bars of soap per batch. Quantities over or under are undesirable. A sample of 10 batches shows the following number of bars of soap. The population is assumed to be normal. 108, 118, 120, 122, 119, 113, 124, 122, 120, 123 Using a .05 level of significance, ...continues

Hypothesis Testing

An Electric Co. Operates a fleet of trucks that provide electrical service to the construction industry. Monthly mean maintenance cost has been $75 per truck. A random sample of 40 trucks provided a sample mean of $82.50 per month, with a sample deviation of $30. Managers want a test to determine whether the mean monthly mainte ...continues

Hypothesis Test - Calculation

Using the data set below for the Hypothesis Testing Paper, a new hypothesis test (such as large sample size, small sample size, means and/or proportions, one-and two-tailed tests) that can perform on the data below I pulled together. Perform the five-step hypothesis test on the data and describe the results of the tests and co ...continues

St Petersburg Paradox- Random variables

This is a two part problem that expands on the St Petersburg Paradox. I have attempted this problem and ca not seem to arrive at the answers given in my book. (a) c/2-c (b) 2 log2 Below is the problem A fair coin is flipped until the first tail appears; we win $2 if it appears on the first toss, $4 on the second and in gen ...continues