Edexcel AS Level Maths Statistics

Advantages of a census - answer-It should give a completely accurate result Advantages of a sample - answer-Less time consuming Fewer people have to respond Less data than a census Advantages of Opportunity Sampling - answer-Easy to carry out Inexpensive Advantages of Quota Sampling - answer-Allows a small sample to still represent the whole population No sampling frame required Quick, easy and inexpensive Allows for easy comparison between different groups in the population Advantages of Simple Random Sample - answer-Free of bias Easy and cheap to implement Each sampling unit has equal chance of selection Advantages of Stratified Sampling - answer-Population must clearly classified into distinct strata Advantages of Systematic Sampling - answer-Simple and quick to use Suitable for large samples alternative hypothesis - answer-Tells us about the parameter if your assumption is wrong binomial distribution - answer-When there are a fixed number of trials There are 2 possible outcomes (success or failure) There is a fixed probability of success The trials are independent of each other bivariate data - answer-Data which has pairs of values for two variables Census - answer-Observes or measures every member of a population Class Boundaries - answer-The maximum and minimum values that belong in each class Class Width - answer-The difference between the upper and lower class boundaries Cleaning the data - answer-The process of removing anomalies from a data set. Continuous Variable - answer-A variable that can take any value in a given range Correlation - answer-A measure of the linear relationship between two variables critical region - answer-the area in the tails of the comparison distribution in which the null hypothesis can be rejected Disadvantage of a census - answer-Time consuming and expensive Hard to process large quantity of data Disadvantage of a sample - answer-The data may not be as accurate The data may not be large enough toggle information about the population Disadvantage of Simple Random Sample - answer-A sampling frame is needed Not suitable when the population size is very big Disadvantages of Opportunity Sampling - answer-Unlikely to provide a representative sample Highly dependent on individual researcher Disadvantages of Quota Sampling - answer-Not random sampling can produce bias Population must be divided into groups which can be costly or inaccurate Non-responces are recorded as such Disadvantages of Stratified Sampling - answer-Sample accuracy reflects the population structure guarantees proportional representation of groups within a population Disadvantages of Systematic Sampling - answer-A sampling frame is needed It can intro