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Statistics Worksheet

# Statistics Worksheet - WEB PAGE FOR CHAPTER 8 MULTIPLE...

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WEB PAGE FOR CHAPTER 8 MULTIPLE CHOICE QUESTIONS – SET A 1 If the scores are clustered to the low end of the frequency distribution the distribution is: (a) unimodal (b) multi-modal (c) negatively skewed (d) positively skewed 2 If a distribution is unimodal and symmetrical then: (a) the mean is greater than the mode and the mode is greater than the median (b) the mode and median are equal but both less than the mean (c) the mean is less than the mode and the mode is less than the median (d) the mean, mode and median are equal 3 Skewness in a distribution can be determined by comparing: (a) the mode and the median (b) the median and the mean (c) the mean and the mode (d) any two measures of central tendency 4 For any distribution of raw scores the mean and standard deviation of Z scores are: (a) 1.0 (b) 0.1 (c) 0.0 (d) 1.1 5 A normal distribution always has: (a) a mean of 100 and an SD of 15 (b) a mean of 50 and an SD of 10 (c) a mean of 0 and an SD of 1 (d) a mean of 1 and an SD of 0 6 A probability of .05 means: (a) the event lies within the middle 95% of the distribution (b) the event lies outside the middle 95% of the distribution (c) the event will occur 50% of the time (d) the event will occur once every five times 7 The frequency distribution of a normally distributed set of values can be completely described by: (a) the mean and median (b) mean and SD (c) median and variance (d) median and SD 8 To calculate a Z score we need to know: (a) the mean and standard deviation (b) the raw score and the mean (c) the raw score and the standard deviation (d) the raw score, the mean and the standard deviation

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9 A Z score of + 1.0 implies a value better than what percentage of the values? (a) 50% (b) 68% (c) 75% (d) 84% 10 The area under the normal curve is considered to be equal to: (a) 1.0 (b) 10 (c) 100 (d) varies depending on the size of sample 11 If a group of subjects have a mean score of 20 and a standard deviation of 4 on a test, approximately 95% of the scores lie between: (a) 16 and 28 (b) 18 and 22 (c) 16 and 24 (d) 12 and 28 12 In a normal distribution, what proportion of scores fall within the interval between the mean and one standard deviation above the mean? (a) 25% approx (b) 34% approx (c) 64% approx (d) 84% approx 13 A set of values has M = 75 and SD = 25. What is the Z score for a raw score of 100? (a) +1.0 (b) +2.0 (c) +3.0 (d) –1.0 14 In a normal distribution the area to the left of Z = 0 contains what percentage of the distribution? (a) 0 (b) 25% (c) 50% (d) 100% 15 What does p<0.05 mean? (a) the probability of a chance occurrence of more than 1 in 20 (b) the probability of a chance occurrence of less than 1 in 20 (c) the probability of a chance occurrence of less than 5 in 20 (d) the probability of a chance occurrence of less than 1 in 100 16 Can outcomes be significant at the 1% level but not at the 5% level? (a) false (b) true (c) sometimes (d) depends on N SPSS ACTIVITY Access SPSS Chapter 8 Data File. Assess scale variable ‘ age ’ for normality and transform using an appropriate technique.
MULTIPLE CHOICE QUESTIONS – SET B 1 If a distribution has scores clustered more at one end than at the other then the distribution is said to be: (a) unimodal (b) assymmetrical (c)

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Statistics Worksheet - WEB PAGE FOR CHAPTER 8 MULTIPLE...

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