Ergonomic keyboards may increase typing speed. Ten administrative assistants were chosen to type on both standard and ergonomic keyboards. The resulting word-per-minute typing speeds are shown below. Complete parts a and b. Ergonomic: Standard: B8 B8 58 56 58 51 75 a. Were the two samples obtained independently? O A. The same administrative assistant was used on both the ergonomic and standard keyboards; therefore the sampling was done dependently. The samples are matched pairs. O B. The samples are independent. O C. The samples are dependent because they were done on only two different keyboards. O D. There is insufficient information to determine if the samples are independent b. Conduct a hypothesis test to determine if the ergonomic keyboards increase the average words per minute attained while typing. Use a p-value approach with a significance level of 0.01. Let My = Hy - H2. where uy is the ergonomic typing speed and My is standard typing speed. Determine the null and alternative hypotheses. Choose the correct answer below. OA. HO Ho 20 OB. HO: Hy = 0 HA : Hy