You are interested in determining if the average amount of time (in hours) that students spend on the Internet per day is greate
r than 2 hours. The data below are from a random sample of 11 students. 2.5 100 .5 1 1.5 3 3.5 4 3 4 2.5 What did you notice from your preliminary analysis of the data
In inferential statistics, a normal distribution is said to be symmetric and should be single-peaked when working with a random selection of a large sample.
The high number of the sample is 100 which is further from other samples, the central limit theorem explains that the sample size of independent mean must be large enough to mimic the population for the sample to be normal or nearly normal. So, the sample is not appropriately normal and should be larger in size.
We can see from this survey that 7 teenagers prefer rock and roll. The number of all teenagers in the survey is: 12 + 5 + 7 + 6 + 6 + 4 = 40 P ( rock ) = 7 / 40 Answer: C ) 7 / 40
