CSUF ISDS 361A Final Conceptuals Questions and Answers Rated A

CSUF ISDS 361A Final Conceptuals Questions and Answers Rated A the collection of all units of interest in a particular study is called? sample population parameter statistic population Suppose there is a dataset of baseball scores from several matches between the Seattle Mariners and Anaheim Angels. A statistician wants to summarize the data using graphical and numerical measures. What branch of Statistics will she need to use? Descriptive Statistics Inferential Statistics descriptive statistics Which of these is not a measure of variability? standard deviation IQR mean range mean A histogram with a long left tail is said to be: positively skewed negatively skewed negatively skewed For a positively skewed distribution: mean is smaller than median mean is greater than median mean is equal to the median mean is greater than median A standard normal distribution is one that has: zero mean and zero variance zero mean and variance = 1 zero mean and constant variance zero mean and variance = 1 For a random variable X with mean = 10 and variance = 25, what is P(X > 20)? P(Z < 2) P(Z > 2) P(Z > 2) Which theorem or rule helps determine the sampling distribution of the sample mean? chebyshev's theorem empirical rule central limit theorem central limit theorem How does the standard error of the sampling distribution behave as the sample size (n) increases? decreases increases stays unchanged decreases in linear regression if the estimated equation fits all the data values perfectly, the value of R2 would be: 0 -1 -1 in order to asses the fit of the linear regression