Midterm Practice Questions #2 Answers

Practice Questions Answers 1. Determine the types of scale used in the results of an examination recorded pass/ fail a. Ordinal b. Nominal c. Continuous d. Interval 2. Determine the types of scale used for the results recorded as letter grades A, B, C, D a. Ordinal b. Nominal c. Continuous d. Interval 3. Determine the types of scale used for the temperature of eight different plastic spheres a. Ordinal b. Nominal c. Continuous d. Interval 4. Determine the types of scale used for the salaries of college professors a. Ordinal b. Nominal c. Continuous d. Interval a. Whole population is important. b. Calculation of sample size is not based on effect size. 5. When the normal distribution is used, the spread increases while the height of the curve decreases for the: a. Larger Variance b. Smaller Variance c. Larger Standard Deviation d. Smaller Standard Deviation 6. If the value of x for normal distribution is 45 and the mean of normal distribution is 75 and the standard deviation is 25 then the standard random variable is: a. -1.6 b. -1.2 c. -2 d, 1.5 7. Validity is the ability of a research tool to measure what is intended to measure a. True b. False 8. When the appropriate techniques and methodologies are used, validity offers a response to the research question that it was intended to address. a. True b False 9. The data in the table represent the number of hours of relief provided by five different brands of headache tablets given to 25 subjects with fevers of 38oC or higher. Which statistic test is used at the 5% level of significance to claim that the average number of hours of relief provided by the tablets differs for all five brands? a. One sample t-test b. Linear Regression c. ANOVA d. independent t-test 10. The blood urea nitrogen count (BUN) if 20 randomly selected patients is given here in mg/dl. The readings are: 17, 18,13,14,12,17,11,20,13,18,19,17,14,16,17,12,16,15,19,22. (subjective question: calculate each) a. Calculate Mean (16) b. Calculate Median (16.5) c. Calculate Mode (17) 11. Other things being equal, increasing the sample size (n) causes width of a confidence interval to a. Increase b. Decrease c. Stay the Same 12. The value that separates a rejection region from an acceptance region is called a __________. a. Parameter b. Critical Value c. Confidence Coefficient d. Significance Level 13. P-value = 0.001, Significance Level = 0.05. There is __ evidence to _____the claim that more women than men speed. a. Enough / Support b. Not Enough / Support c. Not Enough / Reject d. Enough / Reject 14. The average life span in Canada is at least 55 years in Canada. This statement is a a. One Tailed b. Two Tailed 15. A psychologist claims that the average IQ of a sample of 50 children is significantly above the normal IQ of 100. This statement is a a. Null Hypothesis b. Alternative Hypothesis 16. The probability you reject the null hypothesis when in fact the null hypothesis is true is called __________. a Type I Error b. a Type II Error c. the power 6. 17. A Type II error occurs when a. Null hypothesis is rejected but should not be rejected b. Null hypothesis is not rejected but should be rejected. c. Test statistic is incorrect. 18. Selecting the significance level α will determine a. The probability of a Type I error b. The probability of a Type II error. c. The power. 19. A Type I error can occur when the null hypothesis is a. Incorrect b. Correct c. Either incorrect or correct 20. If the significance level, α, is increased, then the chance of a Type I error will a. Remain the same b. Decrease c. Increase 21. The power of a test can be increased by a. Choosing a smaller value for α b. Using a larger sample size c. Using a normal approximation 22. What is the probability of rolling the dice and getting an odd number? a. 1/2 b. 2 c. 4/2 d. 5/2 23. Which of the following is the non-probability sampling strategy? a. Simple random sampling b. Stratified random Sampling c. Cluster sampling d. Purposive Sampling