Which source of bias is most relevant to the following situation: A researcher wants to find out how much people tip on average and she asks people to stop and chat as they are leaving a local family restaurant.

The midpoints of the sides of the large square are joined to form a smaller square. what is the area of the smaller square

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?

Max recorded the heights of 500 male humans. he found that the heights were normally distributed around a mean of 177 centimeters. which statements about max’s data must be true? a) the median of max’s data is 250 b) more than half of the data points max recorded were 177 centimeters. c) a data point chosen at random is as likely to be above the mean as it is to be below the mean. d) every height within three standard deviations of the mean is equally likely to be chosen if a data point is selected at random.