Statistics Exam

When the distribution is normal, which of the following is true?

• median=mode=mean

• median≠mode=mean

• median≠mode≠mean

• mean=median=mode

In a positively skewed distribution, which of the following statements is true?

• Mode>Median

• Median>Mean

• Mean>Mode

• Median

If the variance of a score distribution is 81.0 and its mean is 9.0. What is its standard deviation?

• 6.0

• 7.0

• 8.0

• 9.0

If a graph (scatter gram) is to be constructed on the data the point (6,11) would represent the scores of

• Student A

• Student B

• Student C

• any of the students

There is a risk of Type I Error if one

• rejects a null hypothesis of no difference

• rejects an alternate hypothesis of existing difference

• accepts a null hypothesis

• accepts an alternate hypothesis

Type II Error would occur if one

• Rejects a true Ho

• Rejects a false Ho

• Accepts a false Ho

• Accepts a true Ho

What measurement scale is indicated? Gregorio finished the test in 45 minutes while Pepito finished the same test in 25 minutes?

• nominal

• ordinal

• interval

• ration

What is the primary purpose of a scatter gram?

• To show frequency

• To show correlation

• To show mean

• To show mode

What is the risk called when a false null hypothesis is accepted?

• Type I Error

• Type II Error

• Type III Error

• Type IV Error

Which of the following is a measure of central tendency?

• Variance

• Standard deviation

• Mean

• Range