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# Discovering Statistics

Statistics

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## Quiz 12 : Comparing Several Means

The bigger the margin of error,the smaller the confidence interval.
Free
True False

False

A student draws a playing card from a standard pack of 52.What is the probability that the student draws a king or a heart?
Free
Multiple Choice

B

The standard error is a measure of variability.
Free
True False

True

A sample consists of four observations,scored as 1,3,5,7.What is the standard deviation?
Multiple Choice
A sample survey is an example of an observational study.
True False
The centre of a confidence interval is a sample statistic.
True False
The standard error is a measure of central tendency.
True False
A sample mean is an example of a point estimate.
True False
A population mean is an example of a point estimate.
True False
The average height of a randomly selected group of adult males could be a discrete random variable.
True False
900 secondary school students are selected randomly from across the country because they have achieved 10 GCSEs at grade A -C.There is a standard deviation of 0.4.Assuming a 95% confidence rate,what is the margin of error?
Multiple Choice
The confidence interval is a type of point estimate.
True False
The standard error is calculated only from sample attributes.
True False
The annual number of UK lottery winners could be a discrete random variable.
True False
The best method for investigating casual relationships is an observational study.
True False
An observational study requires fewer resources than an experiment.
True False