Research Methods II

Question 1

What is the difference between a histogram and a frequency distribution graph?

Answer 1

Histogram is a type of graph used to report the number of times groups of values appear in the data set. Frequency distribution is a type of graph used to report the distribution of how frequently values appear in the data set.

Question 2

Define standard deviation.

Answer 2

Standard deviation is a measure of the average distance of each data point from the mean. Larger the speed, the larger the standard deviation.

Question 3

What is the significance of the T-test?

Answer 3

The t-test considers each data point from both groups to calculate the probability that two samples were drawn from the same population.

Question 4

What is the p-value?

Answer 4

It is the value expressing the probability calculated from the t-test. If the p-value is less than 0.05 the results are said to be statistically significant.