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… View Article

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… View Article

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… View Article