# A researcher records the number of classroom

• Test Prep
• 24
• 50% (2) 1 out of 2 people found this document helpful

This preview shows page 21 - 24 out of 24 pages.

##### We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
The document you are viewing contains questions related to this textbook.
Chapter 2 / Exercise 1
Essentials of Statistics for the Behavioral Sciences
Gravetter/Wallnau
Expert Verified
88.A researcher records the number of classroom interruptions during each of two class sessions. Which session has the largest standard deviation?Session A: 12, 15, 18, 24, and 30 Session B: 8, 10, 12, 16, and 20A)Sample AB)Sample BC)Both samples have the same standard deviation.
89.Which of the following is consistent withthe empirical rule?
90.(blank)A)B)C)D)91.Which of the following is an example of a distribution with NO variability?
##### We have textbook solutions for you!
The document you are viewing contains questions related to this textbook.
The document you are viewing contains questions related to this textbook.
Chapter 2 / Exercise 1
Essentials of Statistics for the Behavioral Sciences
Gravetter/Wallnau
Expert Verified
92.The degrees of freedom for the sample variance
Short Answer practice items from all chapters (remember: This is just to help you learn the material. The exams only contain multiple choice items.93.Define the median.94.(4 pts) A researchers measures the following heights (in inches) of CEO's selected at random: 72, 75, 75, 66, 64, 79, 79, 75, 70, 72, 75, 77, 77, 74. Which measure of central tendency is most appropriate for describing these data? Why? (Hint: Draw the shape of this distribution first).95.(2 pts) Describe SS (Sum of squares) in words. (Be sure you are complete, including all parts of this definition).96.(2 pts) When can variability be negative?97.Give the definition of variance in words.98.(4 pts) Distinguish between descriptive and inferential statistics.99.What is the definition of an operational definition?100.(4 pts). Explain why the sample variance and population variance are computed differently.101.According to the empirical rule, for data that are normally distributed, at least _______% of data lie within 2 standard deviations from the mean.102.Why is the variance a preferred measure of variability?103.Why is the mean a preferred measure ofcentral tendency?
104.(4 pts). Give an example of a hypothesis that includes "well-being" ratings as the dependent variable and physical activity as the independent variable.105.(4 pts). Sketch a graph that shows a positive correlation between scores on computer use (hours per week) and exercise (minutes per week).106.Draw a bimodal distribution in a graph.107.(6 pts). Draw the normal curve and it, indicate all features of the "empirical rule" from chapter 4. That is, label the standard deviations above and below the mean, as well as the proportions of scores under the curve that correspond to each standard deviation above and below the mean.108.Which of the three research methods (designs) uses manipulation, randomization, and comparison/control to ensure enough control to allow conclusions about cause and effect?in Additional Partial list of concepts and calculations to know for exam.(I.e., Of course, the exam will sample from all of the covered material and so you are expected to study all assigned material. However, if you know just the example multiple choice and short answer above and the key concepts listed below and the homework, you should do very well). E.g., remember that exams do not cover material that was only presented in labs (see syllabus). Consequently, you will not use SPSS on any exam.