According to a survey, high school girls average 100 text messages daily (The Boston Globe, April 21, 2010). Assume the population standard deviation is 20 text messages. Suppose a random sample of 50 high school girls is taken. [You may find it useful to reference the z table.] a. What is the probability that the sample mean is more than 105? (Round "" value to 2 decimal places, and final answer to 4 decimal places.) Probability b. What is the probability that the sample mean is less than 95? (Round "z" value to 2 decimal places, and final answer to 4 decimal places.) Probability c. What is the probability that the sample mean is between 95 and 105? (Round "z" value to 2 decimal places, and final answer to 4 decimal places.)

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Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.