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The bigger the margin of error,the smaller the confidence interval.

Free

True False

Answer:

Answer:

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

Answer:

Answer:

B

A sample consists of four observations,scored as 1,3,5,7.What is the standard deviation?

Multiple Choice

Answer:

The average height of a randomly selected group of adult males could be a discrete random variable.

True False

Answer:

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

Answer:

The best method for investigating casual relationships is an observational study.

True False

Answer:

The standard deviation requires knowledge of at least one population parameter.

True False

Answer:

The number of twentieth-century US presidential elections is not a discrete random variable.Why not?

Multiple Choice

Answer: