Sta 2381 - Study guides, Class notes & Summaries

STA 2381 (Probability and Statistics) FORM A EXAM 2Questions with Answer Key 2023/2024 Spring Series Baylor University

STA 2381 (Probability and Statistics) FORM A EXAM 2Questions with Answer Key 2023/2024 Spring Series Baylor University.

T/F: Every estimator has a sampling distribution that is identical to the distribution of the population of interest - ANSWER False T/F: Chebychev's Theorem is used to help understand the concept of a standard deviation and applies to any random variable - ANSWER True T/F: The empirical rule is used to help understand the concept of the location of a population and applies only to symmetric unimodal continuous random variables - ANSWER False T/F: The empirical rule is used to help underst...

T/F: Every estimator has a sampling distribution that is identical to the distribution of the population of interest - ANSWER False T/F: Chebychev's Theorem is used to help understand the concept of a standard deviation and applies to any random variable - ANSWER True T/F: The empirical rule is used to help understand the concept of the location of a population and applies only to symmetric unimodal continuous random variables - ANSWER False

Descriptive statistics a. Utilizes sample date to make estimates b. Is a statement about the degree of uncertainty associated with statistical inference c. Summarizes and describes important features of the data d. Is a measurement that cannot be measured on a natural numerical scale - ANSWER C is the correct answer. Descriptive statistics is used to describe/summarize any set of data. Using variability and central tendency, a person can conclude what the results mean. This is an example...

A _____ is a function of the population data. - ANSWER statistic Estimators are _____ variables. - ANSWER random _____ describe a population of interest, while _____ describe a sample. - ANSWER parameters; statistics What is the estimated value of x̄? - ANSWER μ (mu) _____ is the population standard deviation, while _____ is the sample standard deviation. - ANSWER σ (sigma); s

Descriptive Statistics v Inferential Statistics - ANSWER Descriptive statistics describes sets of data. Inferential statistics draws conclusions about the sets of data based on sampling. Population v Variable - ANSWER A population is a set of units of interest to a study. A variable is a characteristic or property of the units being studied. Population v Sample - ANSWER A population is a set of units of interest to a study. A sample is a subset of the units of a population.

T/F) The probability distribution of all the possible sample meas composed from samples of size n is known as the sampling distribution of the sample mean - ANSWER True (T/F) The standard error of the sample mean is another term for the standard deviation of the sample mean - ANSWER True (T/F) With increasing sample size the sampling distribution of the sample mean approaches normality, regardless of the distribution of the population from which the data is sampled - ANSWER True