# Question: A seminal study conducted by scientists at the University of

A seminal study conducted by scientists at the University of Illinois found evidence of improved memory and reasoning for those who took three vigorous 40-minute walks a week over six months (Newsweek, June 28-July 5, 2010). As an assistant manager working for a public health institute based in Florida, you would like to estimate the proportion of adults in Miami, Florida, who follow such a walking regimen. Discuss the sampling bias in the following strategies where people are asked if they walk regularly:

a. Randomly selected adult beachgoers in Miami.

b. Randomly selected Miami residents who are requested to disclose the information in prepaid envelopes.

c. Randomly selected Miami residents who are requested to disclose the information on the firm's website.

d. Randomly selected adult patients at all hospitals in Miami.

a. Randomly selected adult beachgoers in Miami.

b. Randomly selected Miami residents who are requested to disclose the information in prepaid envelopes.

c. Randomly selected Miami residents who are requested to disclose the information on the firm's website.

d. Randomly selected adult patients at all hospitals in Miami.

## Answer to relevant Questions

In the previous question regarding walking regimens of the residents of Miami, explain how you can obtain a representative sample based on the following sampling strategies: a. Simple random sampling. b. Stratified random ...Georgia residents spent an average of $470.73 on the lottery in 2010, or 1% of their personal income (http://www.msn.com, May 23, 2012). Suppose the amount spent on the lottery follows a normal distribution with a standard ...Acceptance sampling is an important quality control technique, where a batch of data is tested to determine if the proportion of units having a particular attribute exceeds a given percentage. Suppose that 10% of produced ...A simple random sample of 25 observations is derived from a normally distributed population with a known standard deviation of 8.2.a. Is the condition that is normally distributed satisfied? Explain.b. Compute the margin ...A manager is interested in estimating the mean time (in minutes) required to complete a job. His assistant uses a sample of 100 observations to report the confidence interval as [14.355, 17.645]. The population standard ...Post your question