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Response to Amy Cuddy: Your body language shapes who you are

Amy Cuddy was an intelligent young woman who was known to be smart and gifted until the age of 19, when she had encountered a horrific car accident. After this accident, Amy woke up in a head injury rehab ward. Her head injury had caused her IQ to drop by two standard deviations and she had to withdrawal from college. From having a core identity as being smart to the knowledge of her decrease in IQ had left Amy completely powerless. She felt as if her identity had been taken away from her and had lost the confidence that she once had. She tried several times to get back into college and to pursue her education but they kept telling…

Confidence Intervals for One Population Proportion

A population proportion is the proportion (percentage) of a population that has a specified attribute. For example, if the population under consideration consists of all Americans and the specified attribute is “retired, “the population proportion is the proportion of all Americans who are retired. Statisticians often need to determine the proportion (percentage) of a population that has a specified attribute. Some examples are •The percentage of U.S. adults who have health insurance •The percentage of cars in the United States that are imports •The percentage of U.S. adults who favor stricter clean air health standards •The percentage of Canadian women in the labor force. In the first case, the population consists of all U.S. adults and the specified attribute is…

﻿Chapter 7 Exam Review. Solve the problem.

1) Find the critical value that corresponds to a degree of confidence of 91%. A) 1.70B) 1.34 C) 1.645 D) 1.75 2) The following confidence interval is obtained for a population proportion, p:0.817 < p < 0.855 Use these confidence interval limits to find the point estimate, A) 0.839 B) 0.836 C) 0.817 D) 0.833 Find the margin of error for the 95% confidence interval used to estimate the population proportion. 3) n = 186, x = 103 A) 0.0643 B) 0.125 C) 0.00260 D) 0.0714 Find the minimum sample size you should use to assure that your estimate of will be within the required margin of error around the population p. 4) Margin of error: 0.002; confidence level: 93%;…