Karen is doing a survey to find out how often people go to the cinema and how much they spend. She stands outside a cinema and asks people as they go in. Write a reason this sample could be biased. Could someone please explain to me the concept behind bias.

Use the function f(x) is graphed below. the graph of the function to find, f(6). -2 -1 1 2

Can you me find the missing length. i attached an image.

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.