3. (Excel MM is ajogger who runs the same route every day. On 18 consecutive days, she recorded the number of steps using a pedometer on her cell phone, shown on table below. X = Number of steps per day, using a pedometer Im n n n a. Construct and interpret a 95% confidence interval for the average number of steps Karen takes on her runs. What is the margin of error? b. What sample size Karen needs to take to obtain a margin of error E = i 20 steps with 95 percent confidence? Determine the required sample size. Use a standard deviation of 98 to determine the sample size. c. Karen has been trying to increase the number of steps per day for health reasons. Use Excel to plot a line chart of the data. What does the data suggest about the pattern of step overtime? Has her effort to increase the number of steps been successful