MTH126 Applied Statistics Final Exam

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1 MTH126 Applied Statistics Final Exam MTH126 – Applied Statistics Final Exam – February 22, 2013 ~ Please show your work ~ Name_________________________________________________________________________ In the box to the right, e nter ‘T’ for ‘True or ‘F’ for False for each of the following questions (1 point each) 1 One - tailed tests reflect a non - directional hypothesis . F 2 The expected value is also referred to as the ‘long - term’ average or mean . T 3 The test statistic for any chi - square test is always less than or equal to zero. F 4 The f - distribution, like the normal distribution is symmetrical . F 5 The mean, median, and mode typ ically differ substantially in normally distributed data . F 6 If two variables are significantly correlated, we can conclude that one variable causes the change in the other variable . F 7 A normal distribution exists for every combination of mean and standard deviation T 8 A correlation of - .9 is stronger than a correlation of .1 T 9 If the value for one variable goes down when the value for another variable goes up, these variables are said to be negativel y correlated . T 10 The mode is highly sensitive to outliers or extreme results . F 11 In an ANOVA test, the null hypothesis states that at least two of the group means are not equal . F 12 The mathematical tool used to study randomness is called probability . T 13 Mutually exclusive events cannot occur at the same time . T 14 T he coefficient of determination represents the percent of variation in y that is NOT explained by variation in x using the regression line F
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2 15 The normal distribution is typically used when the population standard deviation is unknown . F

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