HELP NEEDED ASAP! 100 sample widgets were taken from an assembly line for quality control purposes. The average thickness of the 100 samples was 8 mm, and the standard deviation of exactly 1 mm.
a. Write a statement about the thickness of the widget at the 68% confidence level using a compound inequality.

b. Write a statement about the thickness of the widget at a 95% confidence level in plus/minus notation.

Name these type of angles shown check all that applies

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

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.