Day3_Slides
... possible values for the mean number of times that a person accesses the facebook homepage in the last week • To be 95% confident, we can take all values within 2 standard deviations (of the sampling distribution) from our original sample mean (not the observed mean of the sampling distribution) • Th ...
... possible values for the mean number of times that a person accesses the facebook homepage in the last week • To be 95% confident, we can take all values within 2 standard deviations (of the sampling distribution) from our original sample mean (not the observed mean of the sampling distribution) • Th ...
08 Variance and Standard Deviation (ctd)
... interest divided by the total number of possible outcomes. Example: What is the probability of rolling a '6' with a fair die? Number of outcomes of interest: 1 (a '6'') Number of possible outcomes: 6 ('1', '2', 3', '4', '5', '6') Probability = 1 / 6 = 0.167. Expected relative frequency (or long run ...
... interest divided by the total number of possible outcomes. Example: What is the probability of rolling a '6' with a fair die? Number of outcomes of interest: 1 (a '6'') Number of possible outcomes: 6 ('1', '2', 3', '4', '5', '6') Probability = 1 / 6 = 0.167. Expected relative frequency (or long run ...
Chapter 8 Sampling Distributions – Sample
... b) What is the probability that a random sample of five soldiers will have an average head circumference that is greater than 23.5 inches? Ex 2) Suppose a team of biologists has been studying the Pinedale children’s fishing pond. Let x represent the length of a single trout taken at random from the ...
... b) What is the probability that a random sample of five soldiers will have an average head circumference that is greater than 23.5 inches? Ex 2) Suppose a team of biologists has been studying the Pinedale children’s fishing pond. Let x represent the length of a single trout taken at random from the ...
Chapter 3: Data Description
... • most appropriate average for skewed ratio or interval data or data on salaries • difficult to compute because data must be sorted • unaffected by extreme data Arithmetic mean: centre of balance of data. • sum of numbers divided by n • best average for unskewed ratio or interval data • easy to comp ...
... • most appropriate average for skewed ratio or interval data or data on salaries • difficult to compute because data must be sorted • unaffected by extreme data Arithmetic mean: centre of balance of data. • sum of numbers divided by n • best average for unskewed ratio or interval data • easy to comp ...
Document
... Hence, one can be 95% confident that the true standard deviation for the nicotine content of all cigarettes manufactured is between 1.2 and 2.3 milligrams based on a sample of 20 cigarettes. ...
... Hence, one can be 95% confident that the true standard deviation for the nicotine content of all cigarettes manufactured is between 1.2 and 2.3 milligrams based on a sample of 20 cigarettes. ...
Confidence Intervals – Introduction
... • For example, the sample mean X is a point estimate of the population mean μ but because of sampling variability, it is virtually never the case that x = μ . • A point estimate says nothing about how close it might be to μ. • An alternative to reporting a single sensible value for the parameter bei ...
... • For example, the sample mean X is a point estimate of the population mean μ but because of sampling variability, it is virtually never the case that x = μ . • A point estimate says nothing about how close it might be to μ. • An alternative to reporting a single sensible value for the parameter bei ...
Document
... average of the values that the random variable takes on, in the long run. Standard Deviation of a Discrete Random Variable – The standard deviation of the values that the random variable takes on, in the long run. ...
... average of the values that the random variable takes on, in the long run. Standard Deviation of a Discrete Random Variable – The standard deviation of the values that the random variable takes on, in the long run. ...
