Statistical Analysis

What is standard deviation?

• How much a score fluctuates
• How much a score deviates from its correct answer
• A spread of scores around the mean 
• A spread of scores around the standard

How can you present standard deviation on a graph?

• Using a plot graph
• Using columns
• Using error bars
• Using olympic bars

This graph shows a golfer being given 30 test putts at the end of each training session. She had 5 tests. The distance the ball stopped away from the whole was recorded. Which test had the most consistency?

• Test 3
• Test 2
• Test 1
• Test 4

Normal distribution of data is 

• The data is evenly spread in a normal pattern
• 95% of all values lie within + or - 1SD while 68% will be within +or- 2SD
• The distribution of data is average
• 68% of all values lie within + or - 1SD while 95% will be within +or- 2SD

What is the coefficient of variation?

• The ratio of variation to the SD expressed as a percentage
• The coefficient direction of uncertainty expressed as a percenatge
• The variation of the mean 
• The ratio of SD to the mean expressed as a percentage

What is the purpose of the t-test?

• To find out how many degrees of freedom are evident in a set of data
• To find out if the difference in means is due to the independent variable or simply by chance
• To find out if the difference between standard deviation is significant 
• To find out if the t-test is the same as the coefficient of variation

What is it telling us if the p-value is <0.05

• There is less than 5% possibility the the results are by chance rather than being caused by the independent variable. 
• There is less than 5% chance of the answer being correct
• There is a 95% possibility of the answer being by chance
• There is more than 5% possibility that 95% of the result is caused by the independent variable

What is paired t-test?

• A t-test that measures multiple sets of data
• A t-test which has two sets of data which are paired normally by being the same subjects but could be paired by height, weight, or experience. 
• A t-test that measures two unconnected pieces of data
• A t-test which is used to determine how much a two pieces of data are paired.

When do you choose to conduct a two-tail t-test?

• When you know the direction of the result whether positive or negative
• When you are not sure whether you will get a positive or negative result.
• When you are not sure of the data involved.
• When you are sure that the results will be wrong

When we want to find out if there is a relationship between two things we would use what type of statistical analysis?

• Coefficient
• Varience
• Correlation
• Deviation