support this claim. Use the correct symbol (, p) for the indicated parameter. a.) A skeptical paranormal researcher claims that the proportion of Americans that have seen a UFO is less than 4 in every one thousand. b.) The manufacturer of a refrigerator system for beer kegs produces refrigerators that are supposed to maintain a true mean temperature of 44F, ideal for a certain type of German pilsner. The owner of the brewery does not agree with the refrigerator manufacturer, and Claims he can prove that the true mean tempeture is incorrect.