Stats Help for College-level Students

Hypothesis Testing

5. In the past it took Kim 148.4 seconds to swim 200 meters. Kim wants to know if her average has changed. She records her time on 50 randomly selected occasions and computes the mean to be 147.8 seconds with a standard deviation of 2.3 seconds. a. Perform the appropriate test of hypothesis to determine whether Kim's average t ...continues

Working with probability in the given situation given x-bar and sample size.

Your troop's past cookie sales went sour last year. Parents had to bail you and your troop member out of the hole. For next year the troop wants to know from your customers the planned cookie orders are likely to be for the next year. You get x-bar = $160,000 s = $80,000 and n = 1000. What is the probability that the r ...continues

a) Set up the null and the alternative hypotheses to test if average length of life has increased from 18 months. b) Test your hypotheses using a = 0.05. c) Find the p value. d) Based on the p value, what can you conclude about the average length of life for patients who receive the vaccine? a) Set up the null and the alternative hypotheses to test if the average service speed has increased using the new racket. b) Test your hypotheses using a = 0.05 c) Find the p value. d) Based on the p value, should the tennis pro invest in the new racket?

Four Hypothesis Testing problems Problem 10.17: 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 alternate hypotheses to test this claim. Problem 10.18: The computer center at a university claims that the average amount of time that students spend on-line has incre ...continues

Quantitative Analysis

Quantitative Analysis and Game Theory

Working with Bayes' theorem calculations.

Experience has shown a company that the cost of delivering a small package within 24 hours is $14.80. The company charges $15.50 for shipment but guarantees to refund the charge if delivery is not made within 24 hours. If the company fails to deliver only 2% of its packages within the 24-hour period, what is the expected gain ...continues

Hypothesis Testing , Normal Distribution

1) Hypothesis Testing A. For the statement: The mean amount of Pepsi in cans is at least 12 oz. Express the null hypothesis and the alternative hypothesis in symbolic form. B. Find the z value for the following : The claim is u(mu) =12, and the sample statistics include n =36, xbar = 12.19 and s = .11 C. Determine whether ...continues

Probability - Rolling a Dice

A person rolls a pair of six-sided dice, which are equally likely to come up any number from 1 to 6. If the person rolls a seven he gets $0. If he rolls any other number, he can choose either to win that amount or play the game again from the start. This person believes that the best strategy is to keep rolling until he gets a " ...continues

Probability - Rolling a Dice

A person rolls a pair of six-sided dice, which are equally likely to come up any number from 1 to 6. If the person rolls a seven he gets $0. If he rolls any other number, he can choose either to win that amount or play the game again from the start. This person believes that the best strategy is to keep rolling until he gets a " ...continues

ANOVA Table and Hypothesis Testing

Fill in the following ANOVA table and perform the hypothesis testing. Refer to attachment.

Joint Distributions (multiple choice)

John makes a mark on a straight stick that is 1 meter in length; you assign a uniform distribution to the location of the mark(uniform over the entire length of the stick). John cuts the stick at that mark, making two sticks. John then takes the larger stick and makes a mark on it; you assign a uniform distribution to the loc ...continues