Statistics Questions & Answers

Statistics Questions & Answers __________ occurs when random chance produces a sample statistic that is not equal to the population parameter it represents - ANSWER: Sampling error "the bigger they are, the harder they fall" describes... - ANSWER: A positive linear correlation "The more you save, the less you spend" describes... - ANSWER: a negative linear correlation "the self-confidence of a group of students is positively correlated with their chances of getting through the course"- what does this statement mean? - ANSWER: The chances of passing the course tend to increase as the self-confidence scores of the students increase 12.43 - ANSWER: 12.43 26 red cards and 26 black cards... - ANSWER: is the same as it has always been if the deck is a fair deck A "weak" relationship between two variables is represented by - ANSWER: A large spread of Y scores at each X score A nonlinear correlation looks like what? - ANSWER: Low to high and back to low, like a rainbow! A point on the scatter plot represents how many values? - ANSWER: 2 (X and Y) a probability distribution gives us... - ANSWER: the probability of every possible event in a population A regression line is usually used when - ANSWER: the correlation coefficient is not 0.0 A study about college aptitude of seniors... z score of +1.89, critical value for region of rejection is +1.96, what is correct conclusion? - ANSWER: Since the z value does not fall within the region of rejection, we should not conclude this sample mean represents some other population Advertising executive wanted to know about ad campaign against children smoking...; what is probability of obtaining a sample mean of -0.70 or lower (more negative)? - ANSWER: 0.3632