Question

From a sample of 100 students, the mean number of time streaming Netflix, Prime, Crave etc. per week is 15.5 hours with a standard deviation 6.5 hours.

Using an 80% confidence level, what is the t-value?
(a).1.280
(b).1.290
(c).1.645
(d).1.660

Answer 1

To find the t-value at an 80% confidence level, the correct answer is (d) 1.660.

Step-by-step explanation:

To find the t-value at an 80% confidence level, we need to first determine the degrees of freedom. The degrees of freedom for a sample are calculated by subtracting 1 from the sample size, which in this case is 100 - 1 = 99. Next, we can use a t-table or a t-distribution calculator to find the t-value for a two-tailed test at a 80% confidence level with 99 degrees of freedom. The t-value is approximately 1.660, so the correct answer is (d) 1.660.