Streaks

The appropriate statistical test to use for our study is the 1-sample t test because our question of interest includes the mean of the population. We used the t test instead of the z test because the population standard deviation is unknown.

1. μ = mean number of Snapchat streaks maintained by NOHS students

2. H0 : μ = 15

3. α = 0.05

4. t =x -μs/n

5. Assumptions m

   Ha : μ > 15

   et:

   1. Sample was randomly chosen in Minitab

   2. Sample size was less than 10% of population

   3. Sample size was greater than or equal to 30

6. t  =1.19

7. P-value = 0.119

Sampling

Our population of interest were all students of North Olmsted High School. We did a simple random sample by first obtaining a list of all NOHS students. Then, we put the list into Minitab. We used the Calc>Random Data>Sample feature to generate a list of 100 students, without replacement. We used 100 students because that was less than 10% of our population. Next, we used the Data>Sort option to alphabetize our sample. Once we had an alphabetical list of our sample, we found the second period class of each student and sent out our survey. Our survey  had two questions: 1) Do you have a Snapchat (yes or no) 2) If yes, how many streaks do you have? This was an anonymous survey. Once 80 of our samples were returned, we proceeded with the significance test.