Aradio talk show host asks listeners to call the radio station and give their opinions on a proposed new city ordinance. he uses the opinions of 200 callers to conclude that the voters are overwhelmingly opposed to the ordinance.
why is this sample likely to be biased?
radio listeners are more likely to be opposed to city ordinances.
there are not enough people in the sample.
the survey is voluntary and includes only listeners of this radio program.
the entire population of the city was not surveyed.

(co 3) the soup produced by a company has a salt level that is normally distributed with a mean of 5.4 grams and a standard deviation of 0.3 grams. the company takes readings of every 10th bar off the production line. the reading points are 5.8, 5.9, 4.9, 6.5, 5.0, 4.9, 6.2, 5.1, 5.7, 6.1. is the process in control or out of control and why? it is out of control as two of these data points are more than 2 standard deviations from the mean it is in control as the data points more than 2 standard deviations from the mean are far apart it is out of control as one of these data points is more than 3 standard deviations from the mean it is in control as the values jump above and below the mean