Students want to determine if there is a significant correlation between the amount of free time spent using their cell phones and their GPA. Determine the type of study used in each examples (a-c) below.
a)
Part A
(a.) 50 students were selected randomly and asked about the number of hours they spent in a week using their phones and their current GPA.
Part B
(b.) The GPA's of 50 randomly selected students that do not own cell phones were recorded and compared to 50 randomly selected students with cell phones and their
GPA's.
Part C
(c.) Ten students with poor GPA's had their cell phones restricted for a year. After the year their current GPA was compared with their GPA from the previous year.
Part D
Which of the above examples (a-c) would you suggest be used for the study? Explain your reasoning.

Quick translate "x is 12 units from 20" into an equation. what are the values of x being described? if you can answer any of my other questions that'd be great too

Aflower has 26 chromosomes. to create a new flower, how many chromosomes would a sperm cell have? what is this process called? part 2: within a flower cell that has 26 chromosomes, how many chromosomes would a cell that is created within the stem of a flower as it grows, have? what is this process called?

Design an er diagram for keeping track of information about votes taken in the u.s. house of representatives during the current two-year congressional session. the database needs to keep track of each u.s. state's name (e.g., texas', new york', california') and include the region of the state (whose domain is {northeast', midwest', southeast', southwest', west'}). each congress person in the house of representatives is described by his or her name, plus the district represented, the start date when the congressperson was first elected, and the political party to which he or she belongs (whose domain is {republican', democrat', 'independent', other'}). the database keeps track of each bill (i.e., proposed law), including the bill name, the date of vote on the bill, whether the bill passed or failed (whose domain is {yes', no'}), and the sponsor (the congressperson(s) who sponsored - that is, proposed - the bill). the database also keeps track of how each congressperson voted on each bill (domain of vote attribute is {yes', no', abstain', absent'}). additional information: