Stats Maths A-Level Year 1 Edexcel

A variable can - answer-take any of a range of specific values Acceptance region - answer-The region where we accept the null hypothesis Actual significance level of a hypothesis test - answer-The probability of incorrectly rejecting the null hypothesis Age is always rounded - answer-down Alternative hypothesis - answer-H1, tells you about the parameter is your assumption is shown to be wrong Anomalies - answer-Where an outlier should be removed from the data since it is clearly an error and ti would be misleading to keep it in. Area of histogram - answer-Proportional to the frequency in each class. Beaufort scale - answer-1: Calm, less than 1 knot 1-3: Light, 1 to 10 knots 4: Moderate, 11 to 16 knots 5: Fresh, 17 to 21 knots Beijing - answer-Worldwide, Northern Hemisphere, Inland Bivariate bara - answer-Data which has pairs of values for two variables. Calculate estimates for the variance and standard deviation of the data in a grouped frequency table using - answer-the midpoint of each class interval Camborne - answer-UK, Southern, Coastal Causal relationship - answer-Two variables have a causal relationship if a change in one variable causes a change in the other. Census - answer-Observes or measures every member of a population Census advantages - answer-It should give a completely accurate result Census disadvantages - answer-- Time consuming and expensive - Cannot be used when the testing process destroys the item - Hard to process large quantity of data Class boundaries - answer-The class boundaries tell you the maximum and minimum values that belong in each class Class width - answer-The class width is the difference between the class boundaries Classes - answer-When data is presented in a grouped frequency table, the specific data values are not shown. The groups are more commonly known as classes. Cleaning the data - answer-The process of removing anomalies from a data set. Complement of A - answer-not A. Continuous - answer-Any value in a given range Correlation - answer-Describes the nature of the linear relationship between two variables. Countif - answer-Command in a spreadsheet to work out the frequency in each class Critical region - answer-A region of the probability distribution which, if the test statistic falls within it, would cause you to reject the null hypothesis Critical regions for two-tailed tests - answer-One at each end of the distribution Critical value - answer-The first value to fall inside of the critical region Cumulative distribution - answer-Statistics Binomial CD Cumulative frequency diagram - answer-If you are given data in a grouped frequency table, you are not able to find the exact values of the median and quartiles. The diagram can help find estimates for the mean, quartiles and percentiles. Cumulative probability function - answer-Tells you the sum of all the individual probabilities up to and including the given value of x in the calculate P(X ≤ x) Daily maximum gust - answer-in knots - this is the highest instantaneous windspeed recorded. The direction from which the maximum gust was blowing is also recorded. Daily maximum relative humidity - answer-Given as a percentage of air saturation with water vapour. Relative humidities above 95% give rise to misty and foggy conditions. Daily mean cloud cover - answer-Measured in oktas or eighths of the sky covered by cloud Daily mean pressure - answer-Measured in hectopascals (hPa) Daily mean temperature - answer-in °C - this is the average of the hourly temperature readings during a 24-hour period. Daily mean visibility - answer-Measured in decametres (Dm). This is the greatest horizontal distance at which an object can be seen in daylight. Daily mean wind direction - answer-Mean wind directions are given as bearings and as cardinal directions. Daily mean windspeed - answer-in knots, averaged over 24 hours from midnight to midnight. The data for mean windspeed is also categorised according to Beaufort scale. Daily total r