Soil acidity is measured by a quantity called the ph, which may range from 0 to 14 for soils ranging from extreme alkalinity to extreme acidity. many soils have an average ph in the more-or-less- neutral 5 to 8 range. a scientist wants to estimate the average ph for a large field from n randomly selected core samples, measuring the ph of each sample. from experience he expects the standard deviation of the measurements to be 0.5. if the scientist selects n = 40 samples, find the approximate probability that the sample mean of the 40 ph measurements will be within 0.2 of the true average ph for the field.

What does it mean by solve the exponential equation for x?

Apsychology student wishes to investigate differences in political opinions between business majors and political science majors at her college. she randomly selects 100 students from the 260 business majors and 100 students from the 180 political science majors. does this sampling plan result in a simple random sample? why or why not? no, because each group of 200 students in the sample does not have the same chance of being selected. yes, because each group of 200 students in the sample has the same chance of being selected. no, because each individual student does not have an equal chance of being selected. yes, because each individual student has the same chance of being selected.

Melanie is buying a bathing suit that costs 39.99. she is given a discount at the cash register of $6.00 when she scratched 15% off on a game piece for a store promotion. what will the sale price of melanie’s bathing suit be?