Given that z20 = –2 and z50= – 1, which of the following do you know? 1.) the variance is 10. 2.) the standard deviation is 30. 3.) the mean is 80. 4.) the median is 40. 5.) the data point x=20 is 2 standard deviations form the mean 6.) the data point x=50 is 1 standard deviation from the mean 7.) the data point x=45 has a z-valued of 1.5

For a science project, a high school research team conducted a survey of local air temperatures. based on the results of the survey, the found that the average temperatures were around 10 degrees higher than expected. this result was wrong. the trouble with the survey was that most of the locations were exposed to direct sunlight and located over asphalt or sand, which resulted in higher temperatures than normal. this is a classic example of an error in which phase of inferential statistics?