Question

in a survey conducted by a reputable marketing agency, 245 of 1000 adults 19 years of age or older confessed to bringing and using their cell phone every trip to the bathroom (confessions included texting and answering phone calls). complete parts (a) through (f) below

d. the individuals selected to be in the study

(e) construct and interpret a 95% confidence interval for the population proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom. select the correct choice below and fill in any answer boxes within your choice
(type integers or decimals rounded to three decimal places as needed. use ascending order)
a. there is a % probability the proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom is between and
b. we are 95% confident the proportion of adults 19 years of age or older who bring their cell phone every trip to the bathroom is between 0.218 and 0.272

(f) what ensures that the results of this study are representative of all adults 19 years of age or older? select all that apply
a. the high confidence level
b. random sampling
c. sampling from adults 19 years of age or older
d. the large sample size

Explanation:

• Random sampling (B): Random sampling helps ensure that each individual in the population (adults 19 or older) has an equal chance of being selected. This reduces bias and makes the sample more likely to be representative of the entire population.
• Sampling from adults 19 years of age or older (C): Since the population of interest is adults 19 years of age or older, sampling from this specific group directly targets the relevant population. If the sample was drawn from a different group (e.g., teenagers), it would not be representative of the population in question.

Answer:

B. Random sampling, C. Sampling from adults 19 years of age or older