Stats Help for College-level Students

Business Statistics

Finding the number of different combinations.

Business Statistics

Probability Questions

Probability using Binomial Distribution

7) On a very hot summer day, 5% of the production employees at Midland States Steelare absent from work. The production employees are to be selected at random for a special in-depth study on absenteeism.What is the probability of selecting 10 production employee at random on a hot summer day and finding that none of them are abs ...continues

Business Statistics

Probability questions

Probability - Binomial, Combinations

12) If 3% of the electric bulbs manufactured by a company are defective, find the probability that in a sample of 100 bulbs, five are defective 13) Three cards are drawn from a deck of 52 cards without replacement. Find the probability that a) two are jacks and one is king b) all cards are of one unit ...continues

Central limit theorem/Sampling distribution of a sample mean

An SRS of 400 American adults is asked, "What do you think is the most serious problem facing out schools?" Suppose that in fact 30% of all adults would answer "drugs" if asked this question. The proportion X of the sample who answers "drugs" will vary in repeated sampling. In fact, we can assign probabilities to values of X us ...continues

Central limit theorem/sampling distribution of a sample mean

A bottling company uses a filling machine to fill plastic bottles with cola. The bottles are supposed to contain 300 milliliters. In fact, the contents vary according to a normal distribution with mean=298 ml and standard deviation=3 ml. a)What is the probability that an individual bottle contains less than 295 ml? b)What is t ...continues

Set up the null and the alternative hypotheses to test if the average bag weighs at least 20 lb. Test your hypothesis using a = 0.05. Find the p value. Based on the p value, should the burger outfit accept the shipment of potatoes?

10.10 In an attempt to improve quality many manufacturers are developing partnerships with their suppliers. A local fast-food burger outfit has partnered with its supplier of potatoes. The burger outfit buys potatoes in bags that weigh 20 lbs. It wishes to set up the null and alternative hypotheses to test if the bags do weigh ...continues

Tests of hypothesis: difference between means,

13.11 Top Ten Business Computability PC Connection Software Packages Price ($) Price ($) Windows 95 Upgrade 88 95 Norton Anti-Virus 59 70 McAfee ViruScan 49 60 First Aid 97 Deluxe 54 58 Clean Sweep III 37 37 Norton Utilities 68 75 Netscape Navigator 45 40 MS Office Pro 9 ...continues

Statistics

12.17 M&M / Mars claims that at least 20% of the M&M's in each package are the new blue color. Set up the null and alternative hypotheses to test this claim. 12.21 An automobile company thinks that with new designs, its cars will last longer before having a problem. For this reason, the company wishes to extend the warranty ...continues