Question

1.14 cats on youtube: suppose you want to estimate the percentage of videos on youtube that are cat videos. it is impossible for you to watch all videos on youtube so you use a random video picker to select 1000 videos for you. you find that 2% of these videos are cat videos. determine which of the following is an observation, a variable, a sample statistic, or a population parameter.
a) the percentage of all videos on youtube that are cat videos is a/an:

• sample statistic
• population parameter
• observation
• variable

b) 2%

• sample statistic
• population parameter
• observation
• variable

c) a video in your sample

• variable
• population parameter
• sample statistic
• observation

d) whether or not a video is a cat video

• sample statistic
• variable
• population parameter

Explanation:

a) The percentage of all YouTube videos that are cat - videos refers to the entire population of YouTube videos, so it is a population parameter.
b) 2% is calculated from the sample of 1000 videos, so it is a sample statistic.
c) A video in the sample is an individual data - point, which is an observation.
d) Whether or not a video is a cat video is a characteristic that can take on different values (yes or no) for different videos, so it is a variable.

Answer:

a) population parameter
b) sample statistic
c) observation
d) variable