According to a study released in 2006 by the Centers for Disease Control. 26,2% of all adults aged 18 - 24 rely solely on some Conn of nudes, telephone for all then communication tin other worth. they have no landline telephone). Researchers anticipate that this percentage will climb in the next year As a marketing director for a wireless company. you would like to do a study to determine if this claim is supported so that advertisements can be targeted to this age group.

a. What type of variable was recorded?

Quantitative

Categorical

b. To addicts the question of interest. which type of inference would be most appropriate?

Hypothesis test

Confidence interval

c. Which of the following formulas would be used for the inference selected in part b?

Z= P-P p(1 p) n - R n -p+ z p(1 - p) n (oba - exp exp x = = ((oba 2 8 ) 9 1 1 / / 'n