Lecture 3

Question 1

Name the measures of central tendency

Answer 1

Mean Medium Mode

Question 2

What does inferential statistics tell us?

Answer 2

provides evidence for hypothesis which allows us to draw conclusions

Question 3

What does descriptive statics tell us?

Answer 3

Summarises the sample of data that we collected

Question 4

How do we measure variability?

Answer 4

Range Interquartile range

Question 5

What is the interquartile range?

Answer 5

measure of range that includes the middle bulk of scores

Question 6

How do you calculate sample variance?

Answer 6

S squared= (sum of the total - mean) squared/ sample number - 1

Question 7

How do u calculate standard deviation?

Answer 7

S= (sum of the total - mean) squared/ sample number - 1, then all square rooted

Question 8

What are the three disruptions?

Answer 8

Normal positive skewNegative skew

Question 9

What does a normal distribution consist of?

Answer 9

1) mean, median, mode are the same2) mean is 0, standard deviation of 1

Question 10

In a normal distribution what percent of the scores are within the 1 standard deviation of the mean?

Answer 10

68.3

Question 11

In a normal distribution what percent of the scores are within the 2 standard deviation of the mean?

Answer 11

95.4

Question 12

In a normal distribution what percent of the scores are within the 3 standard deviation of the mean?

Answer 12

99.7