A recent poll of Ms. Vergara's 160 students revealed the following.  They were asked if they did or did not study hard for finals.  They were also asked if they were or were not proud of their final results.  115 students said they studied hard and 105 students said they were proud of their results.  20 students said they didn't study hard AND weren't proud of their results.  What percentage of students studied hard OR were proud of their results?  Use that same two-way table to help you.

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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.