[填空题]
250 households in a town werw o v:.buboodkt7;p-91c9 mw utrhx+j- pye5,e surveyed asking how maniga 6*kz: m9zcm sp;8yy video streaming services the household subscribes to. The outcome of the survey is shown in the following 9zsg*m8 izkaypm ;:6c table.
1. Find the number of households that subscribe to more than 2 services.
2. Find the modal number of streaming services per household.
3. From the data, find
(1) the median number of streaming services;
(2) the lower quartile;
(3) the upper quartile.
A different survey conducted by an entertainment blog asked 150 survey participants of their preference between two video streaming services; Netflix and YouTube TV. The results of this survev data is summarized in the followina table
A $\chi^{2}$ test of independence is carried out at the 10 \% significance level.
4. State
(1) the null hypothesis;
(2) the alternative hypothesis.
5. Write down the number of degrees of freedom for this test.
6. Calculate the expected number of people between 30--45 that prefer Netflix. ≈
7. Find the p value for this test.≈
8. State the conclusion for this test.
