A market researcher polled every tenth person who walks into a store. What type of sampling was used

Evaluate the integral. (sec2(t) i t(t2 1)8 j t7 ln(t) k) dt

Atextile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms. the company wishes to test the hypothesis upper h subscript 0 baseline colon mu equals 12 against upper h subscript 1 baseline colon mu less-than 12 using a random sample of n equals 4 specimens. calculate the p-value if the observed statistic is x overbar equals 11.8. round your final answer to five decimal places (e.g. 98.76543).

The area of a circle is equal to 1 dm². find the radius of the circle.