Si - week 14 worksheet

# Si - week 14 worksheet - MATH 218 SI Session (Fall 2008)...

This preview shows pages 1–2. Sign up to view the full content.

MATH 218 SI Session (Fall 2008) Week 14 Worksheet (11/24 – 11/30) SI Leader: Joy Chen zuoyiche@usc.edu Professors Lin & Song www.usc.edu/si Topics Stressed: The Rest of Hypothesis Testing 1. The Thin Line Company claims that the individuals using its weight loss product for a duration of three months lose, on average, at least 10% of their total body weight. In what follows, you can assume normal distribution for the weight loss percentage. a. A consumer protection agency suspects that the company claim is false. Formulate the agency’s null and alternative hypotheses. b. The agency tests the product on a random sample of 16 individuals, and finds the average body weight loss to be 9%, with a sample standard deviation of 4%. Compute the test statistic value. c. Is there enough evidence that the company’s claim is false, at the 5% significance level? d. Estimate the P-value. Circle one. i) The P-value is less than 0.01 ii) The P-value is between 0.01 and 0.025 iii) The P-value is between 0.025 and 0.05 iv) The P-value is between 0.05 and 0.1 v) The P-value is greater than 0.1. e. What if, instead, the population standard deviation was known to be 4.5%, and out of 16 individuals the average weight loss was 9%? How does that change your rejection region and p-value at 5%

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 01/30/2009 for the course MATH 39514 taught by Professor He during the Fall '08 term at USC.

### Page1 / 4

Si - week 14 worksheet - MATH 218 SI Session (Fall 2008)...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online