Janine wishes to conduct a poll to predict how many students will vote for her for class president.

which polling methods are likely to be biased?

choose all answers that are correct.

a.
five people in each of janine’s classes are selected and asked for whom they intend to vote.

b.
from a list of all students in janine’s grade, 25 students are selected at random and asked for whom they intend to vote.

c.
every 10th student from a list of all students in janine’s grade is selected and asked for whom the student intends to vote.

d.
janine chooses 5 of her friends and asks each to select another 5 students. these 25 students are asked for whom they intend to vote.

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: