Federico works in a small workshop where he makes wheels for the calenders. A customer has asked you to put an iron liner around a wheel to prevent wear. Federico does not know how much material he will use to cover the wheel, so it occurred to him to place it on the floor, make a mark on the part that touched the ground and turn it until it coincides with the floor again. Finally, he measured the track left by the wheel, as shown in the drawing. Is Federico's procedure to obtain the wheel circumference appropriate? why?

the mark left by the wheel is 2.99 m long. estimate the measure of its diameter; You can base yourself on the picture above.

the diameter of the wheel measures about 0.95 m. what is the ratio between this element and the circumference?

( here it is in English if it helps since the photo is in spanish, it’s all the same btw)
(En la foto está en español pero lo que yo escribí está en inglés, todo es lo mismo)

Apoll is being conducted at a mall nothingto obtain a sample of the population of an entire country. what is the frame for this type of​ sampling? who would be excluded from the survey and how might this affect the results of the​ survey? what is the frame for this type of​ sampling? a. the frame is people who need new clothes. b. the frame is people who shop at the mall. c. the frame is people who like to shop. d. the frame is the entire population of the country. who would be excluded from the survey and how might this affect the results of the​ survey? a. any person that does not need new clothes is excluded. this could result in sampling bias due to undercoverage. b. any person who does not shop at the mall is excluded. this could result in sampling bias due to undercoverage. c. any person who does not shop at the mall is excluded. this could result in nonresponse bias due to people not participating in the poll. d. there is nobody that is being excluded from the survey.