In a survey of 100 ​resorts, it was found that   30 had a spa. 58 had a fitness center. 41 had a​ children's club. 13 had a spa and a fitness center. 10 had a spa and​ children's club. 22 had a fitness center and​ children's club. 8 had all three features.   How many of the resorts surveyed had only a​ spa?

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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.