PLEASE HELPP!!

Question

The following data, heartbeats per minute, was collected for a group of 10 men subjected to a stressful situation.

120, 122, 124, 127, 127, 133, 140, 141, 142, 144

1. What is the average heatbeats per minute for the group? (2 points with work)

2. What is the sample standard deviation of heartbeats per minute? (2 points with work)

3. We want to test that the true mean for men subjected to a stress situation is greater than 125 heartbeats per minute at the α = 0.05 level. List out the five steps in hypothesis testing and be sure to write sentences and show your work. (each step is 3 points with work when appropriate)

Answer 1

Average is always found by taking the sum of the group and dividing by number of members in the group (answer to question 1). For example, the average of 10 and 20 is 10+20=30 then divide the 30 by number of members (2) and average would be 15.

2. The standard deviation is a little harder. You need to take each of the numbers and square their difference from the average (mean) then add them together to find the variance. For example with the numbers 10 and 20 the variance is 25 + 25 which equals 50. The standard deviation then is the square root of the varience. 

3. Takes a long time (at least for me) to explain In this answer section . With the other data from the first two questions, work through the hypothesis testing sequence as explained in your text book.