Which of these is an example of a non-random sample?
a.
sunbathers at a free suntan lotion booth on a popular beach were asked about their favorite suntan lotion.

b.
at a free concert on the beach, five people are chosen to receive free music downloads.

c.
twenty customers at a theme park are chosen to receive one free admission on the next visit.

d.
people on a beach boardwalk are surveyed to determine if they have a full-time job.

Tatiana reads 40 pages of her book every night for x number of nights. write an expression that shows the number of pages she has read

Thomas is using a drawing program to complete a construction. which construction could he be completing? two perpendicular lines are drawn. inscribing an equilateral triangle in a circle inscribing a square in a circle inscribing a regular pentagon in a circle inscribing a regular hexagon in a circle

You are in charge of the customer service phone line with many employees. at the end of each phone callthe customers are asked to rate their service from 1 to 5 stars, with 5 being the best. you find the averagerating for 20 randomly selected employees and decide you want to improve the ratings so you require thoseemployees to go through a new training program. you then wait a week and find the new average rating foreach employee. the average change is an increase in 1.3 stars with a standard devation of .9 stars.(a) is this data paired or not paired? (b) what are the null and alternative hypothesis being tested? (c) what is the t-statistic you would use? write the general formula and the final calculation.(d) sketch a t-distribution, label your t-statistic and the probability you would be interested in: