Unit 3 Quiz: Review questions

Can you explain your answer? Use your fingers to indicate your answer: 1=A, 2=B, 3=C, 4=D. After viewing the question, show me your answer in 15 seconds. Next, turn to your neighbor and you have one minute to convince him/her that you are right.

Usually a frequency distribution is depicted by a _____________. Histogram Pie chart Scatterplot All of the above

The tick marks in a histogram show the _____________ of the data values. frequency Interval shape All of the above

If a curve is symmetrical,_______. most of the scores fall at the lower values of the X axis most of the scores fall at the higher values of the X axis if folded in half, the two sides of the curve coincide most of the scores fall at the higher values of the Y axis

Dr. Lili Li is an aerospace engineer Dr. Lili Li is an aerospace engineer. She compares the efficiency of a NASA rocket and a European made rocket. A critic charges that the study is invalid because she compared just one rocket from each manufacturer. What should the engineer reply? Rockets are very expensive to make and she must bite the bullet to accept the sample-size limitation. The study is valid because we should not expect a huge variation in high tech products that require a high degree of precision. Ask President Trump to give more money to NASA so that they can build more rockets. Every research project has limitations. So what!

What is the best and the most common way to report the central tendency of a normal distribution? mean median mode Standard deviation

What is the best way to report the central tendency of a skewed distribution? mean median mode Standard deviation

Which statistics can tell us the variation (dispersion) of the data? Standard deviation Variance All of the above

What is the difference between the formulas for the sample standard deviation (SD) and the population SD? In the formula of the sample SD we need to take the degree of freedom into account (n -1). In the formula of the population SD we need to take the degree of freedom into account (n -1). Both A and B are right