psy230 intro to statistics

D Question 16 2 pts What proportion of cases described by a standard normal curve lie within 1 standard deviation on either side of the mean? O 0% O 34% 68% 50% D Question 17 2 pts A correlation coefficient is a measure of the association between 2 variables significant differences population parameters of central tendency sample standard deviationD Question 18 2 pts Which of the following is a type of kurtosis? leptokurtic unbiased estimate standard deviation variance D Question 19 2 pts Which of the following is a type of kurtosis? O platykurtic O t-test standard normal curve heterogeneityQuestion 20 2 pts What is the problem when we have heterogeneity of variance? For example, in a ttest. 0 Data transformations are required 0 non-linear effects O Nothing 0 Analysis assumptions are violated Question 21 2 pts Scale data are referred to as O nominal or categorical O deviant O ordinal or average 0 interval or ratio Question 22 2 pts You may take an average of these: 0 categorical data 0, nominal data 0 ordinal data 0 interval data Question 23 2 pts What is found by taking the square root of the variance? 0 standard deviation 0 mean 0 median 0 range D Question 24 2 pts The description of the spread of scores around the mean is: variability average skewness mean D Question 25 2 pts Working with two variables is called O triumvirate univariate O odd bivariateD Question 26 2 pts Another name for the correlation coefficient we discussed is: O Neyman's r Pearson's r Chi-square F-test D Question 27 2 pts Significant correlations are not able to indicate the size of the effect the probability level causality O the strength of the effectQuestion 28 2 pts When reporting descriptive data such as the mean, what other dimension should also be reported - a statistic that expresses the spread of scores in the distribution? 0 outlier O skew F) variability 0 percentile Question 29 2 pts When is the mean = the mode in a probability density function? 0 leptokurtic curve 0 skewed curve 0 standard normal cun/e O platykurtic curve D Question 30 2 pts The best unbiased estimate of a population mean is ... a mean from a similar population a sample standard deviation another population mean O a sample mean D Question 31 2 pts The best unbiased estimate of a population standard deviation is the sample standard deviation divided by square root (n - 1) On - 1 ON O (n - 1) squared