150 Sixth-Form Students Are Sampled (A Simple Random Sample)from 3000

question 12

Multiple Choice

150 sixth-form students are sampled (a simple random sample) from 3000 in sixth-form colleges across the West Midlands.From the sampled students,an average IQ of 115 is determined,with a standard deviation of 10.What is the 99% confidence interval?

• A)115 ± 0.01
• B)115 ± 1.22
• C)115 ± 2.10
• D)115 ± 3.22

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