Inferential Statistics
Name two ways of calculating E.
2 of 3 ways
What does Mode mean?
The most popular data entry in a set.
Without Looking, what page of your Log Tables is the Standardising Formula?
p34
What are Mutually Exclusive Events?
Events that cannot happen at the same time.
2024 P2 Q10 C (i)
243
Why do we use 1.96 so frequently when Hypothesis testing?
95% of the data (95% CI) falls between the z scores of -1.96 and 1.96.
2022 DP2 Q1B
Mean: 43.4
Mode: 44
Median: 43
What is the difference between a P-Value and a Z-Score?
P-value is the percentage behind a Z-Score. Z-Score is a point on a normal distribution.
What are independent events?
If one event occurs it was no effect on the other event occurring.
2024 P2 Q10 C (ii)
54
Margin of Error is 4.5%. Calculate the sample size.
494
2020 P2 Q8E
4,6,9,11,14,16,23,25
2024 P2 Q7 A(i)
56.75%
Name one Probability Rule that can be used if Events are independent.
P(A|B)= P(A)
P(AnB)= P(A) x P(B)
2023 P2 Q10 B(iii)
42
2015 P2 Q2 (a)
[86.39,94.51]
2019 P1 Q6A (ii)
6 Root 2 k
2022 DP2 Q7 E (i)
62.46%
A and B are Mutually exclusive. P(A)= 0.1 and P(B)= 0.4. Find P(AnB) and P(AuB).
P(AnB)= 0
P(AuB)= 0.5
2023 DP2 Q6 B (ii)
518/1820 or 37/130
50 surveyed, mean 374, s.d 45. Construct a 95% CI. (3 decimal places)
[361.527, 386.473]
2023 DP2 Q9D
Male to Female, 3:2
2018 P2 Q2 (i)
Maths
State the Rule of Conditional Probability.
P(A|B)= P(AnB)/P(B)
2022 P2 Q10 C
0.6769