Statics Probability Question:

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You still have the same data (a sample size of 7, a mean of 8 and a standard deviation of 4.2) plus the standard error. Next how would you calculate the 95% confidence intervals?

Statics Probability Interview Question
Statics Probability Interview Question

Answer:

1. To work out the 95% confidence interval you would have to multiply the standard error by 1.96.
2. To work out the 95% confidence interval you would have to multiply the square root of the sample size.
3. To work out the 95% confidence interval you would have to multiply the standard error by the standard deviation.
4. To work out the 95% confidence interval you would have to multiply the standard error by 95.

Answer: To work out the 95% confidence interval you would have to multiply the standard error by 1.96.

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Consider the following data to answer the next 3 questions.

You have the following sample data; a sample size of 7, a mean of 8 and a standard deviation of 4.2. From this, what is the standard error?
Finally, you still have the same data (a sample size of 7, a mean of 8 and a standard deviation of 4.2) plus the standard error and you know how to calculate the 95% confidence interval. Thus what is the 95% confidence interval?