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Core - Statistics

    Chapter 7

    Estimates

    7.1 : What are Estimates?01:06

    7.1 : What are Estimates?

    It isn't easy to measure a parameter such as the mean height or the mean weight of a population. So, we draw samples from the population and calculate ...

    5.0K views
    7.2 : Sample Proportion and Population Proportion01:20

    7.2 : Sample Proportion and Population Proportion

    Collecting samples or responses from an entire population takes significant time and effort, so a researcher collects responses from only a sample of that ...

    5.2K views
    7.3 : Confidence Intervals01:21

    7.3 : Confidence Intervals

    An unbiased point estimate is often insufficient to predict a population estimate, such as population mean or population proportion. In this scenario, a ...

    6.2K views
    7.4 : Confidence Coefficient01:24

    7.4 : Confidence Coefficient

    The confidence coefficient is also known as the confidence level or degree of confidence. It is the percent expression for the probability, 1-α, that ...

    7.6K views
    7.5 : Interpretation of Confidence Intervals01:19

    7.5 : Interpretation of Confidence Intervals

    A confidence interval is a better estimate of the population than a point estimate, as it uses a range of values from a sample instead of a single value. ...

    5.7K views
    7.6 : Critical Values01:31

    7.6 : Critical Values

    A critical value is a definite value obtained from a particular probability distribution at a predecided confidence level (or a predecided significance ...

    6.8K views
    7.7 : Margin of Error01:27

    7.7 : Margin of Error

    The margin of error is also called the maximum error of an estimate. The margin of error is the maximum possible or expected difference between the ...

    4.0K views
    7.8 : Sample Size Calculation01:19

    7.8 : Sample Size Calculation

    Knowledge of the sample size is the first requirement to conduct random sampling or an experiment. The sample size is the total number of units, ...

    3.2K views
    7.9 : Estimating Population Mean with Known Standard Deviation01:16

    7.9 : Estimating Population Mean with Known Standard Deviation

    To construct a confidence interval for a single unknown population mean μ, where the population standard deviation is known, we need sample mean as ...

    8.3K views
    7.10 : Estimating Population Mean with Unknown Standard Deviation01:22

    7.10 : Estimating Population Mean with Unknown Standard Deviation

    In practice, we rarely know the population standard deviation. In the past, when the sample size was large, this did not present a problem to ...

    7.6K views
    7.11 : Confidence Interval for Estimating Population Mean01:25

    7.11 : Confidence Interval for Estimating Population Mean

    A point estimate of the population mean is obtained from a single sample. Such a point estimate does not represent a population well because it needs to ...

    7.2K views
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