The developers of a meditation app want to know if there is an effect of adding videos about the benefits of meditation on usage. They found that a sample of 10 users who had access to the video used the app 30 times during the week. They know that the general population of users had a usage score of 20. Test the hypothesis using a 5% probability level. Which of the following is true when determining the critical cutoff point on the t distribution table? You must look up the levels of significance of a one-tailed test The degrees of freedom is 10 You must divide the 5% probability level by 2 when look up the cutoff point. The degrees of freedom is 9