Statistical Analysis and Hypothesis Testing: A Comprehensive Review, Exams of Health Physics

Download Statistical Analysis and Hypothesis Testing: A Comprehensive Review and more Exams Health Physics in PDF only on Docsity! BST 322-BST Final Exam 2- with 100% verified solutions-2023-2024 • Question 1 0 out of 1 points To determine the proportion of variability in one variable that can be accounted for or explained by the variability of a second variable, you would calculate a correlation coefficient, then take its square root. Selected Answer: Tru e Answers: True Fals e • Question 2 1 out of 1 points When the researcher incorrectly rejects the null hypothesis, it is known as: Selected Answer: Type I error Answers: Hypothesis error Statistical significance Type I error Type II error • Question 3 1 out of 1 points Data which uses numbers to provide categories or labels as well as the ordering of the categories are: Selected Answer: Ordina l Answers: Nomin al Ordina l Ratio Interv Alternative hypothesis • Question 10 1 out of 1 points You are studying the effect of hypnosis on weight loss. You will measure each patient's weight pre- and post-intervention. The most appropriate test is: Selected Answer: Dependent groups t-test Answers: One sample t-test MANOVA ANCOVA Dependent groups t-test • Question 11 Causation is not synonymous with association. 1 out of 1 points Selected Answer: Tru e Answers: Tru e False • Question 12 A set of subjects, usually randomly sampled, selected to participate in a research study is called: Selected Answer: Sample Answers: Population Sample Mode Group 1 out of 1 points Partial Selection • Question 13 1 out of 1 points The difference between the highest and lowest score in a distribution is called: Selected Answer: Range Answers: Semi-quartile range Range Mean Median • Question 14 It is important to assess the magnitude or strength of a 0 out of 1 points relationship because this assists you with deciding whether or not a variable A causes variable B. Selected Answer: Tru e Answers: True Fals e • Question 15 1 out of 1 points A variable with equal distances between score units which also has a true meaningful zero is: Selected Answer: Ratio Answers: Ordina l Cardin al Ratio Nomin al • Question 16 0 out of 1 points When examining the relationship between two nominal level variables, you can use a scatterplot to allow you to visualize the relationship between the two. Selected Answer: Tru e Answers: True Fals Response Feedback: e scatterplots are for interval or ratio variables • Question 17 1 out of 1 points Psych nurses wanted to evaluate the effect of three different treatments for anxiety - positive imagery, therapeutic touch, and medication on anxiety score (interval data) while controlling for the effect of length of stay. Which test is most appropriate? Selected Answer: ANCOVA Answers: ANOVA ANCOVA Independent t-test Paired t-test • Question 18 1 out of 1 points Public Health nurses want to compare the mean weight of US 6th graders to a sample of 6th graders in one school. Which statistical test is most appropriate Selected Answer: One-sample t- ANCOVA • Question 24 Data which uses number values with an equal distance between values are: Selected Answer: Interv al Answers: Nomin al Ordina l Norma l Interv al • Question 25 1 out of 1 points 1 out of 1 points A group of neonatal nurses wanted to know if there was a difference in mean heart rate between premature babies who were swaddled and babies who were not swaddled. Babies were randomly assigned to swaddling or no swaddling. Which test is most appropriate? Selected Answer: Independent t- test Answers: One sample t- test ANCOVA Independent t- test Logistic regression • Question 26 0 out of 1 points A perfect negative relationship between two variables is expressed as r = - 1 Selected Answer: Fals e Answers: Tru e False • Question 27 1 out of 1 points A Z score of +/-1.96 is equivalent to these values on a normal distribution. Selected Answer: +/-2 standard deviations Answers: Critical region +/-1 standard deviation +/-2 standard deviations +/-3 standard deviations • Question 28 The distribution of chi-square values is NOT normally distributed. 1 out of 1 points Selected Answer: Tru e Answers: Tru e False • Question 29 1 out of 1 points Not all variables retained in a regression model are required to be significant. Selected Answer: Tru e Answers: Tru e False • Question 30 1 out of 1 points When examining the relationship between a nominal variable and an interval or ratio variable, you would create a table using the nominal variables, calculate the mode and median of the interval or ratio variable, then make a decision regarding the relationship using the mode and median. Selected Answer: Fals e Answers: True Fals e • Question 31 A significant finding with the 2 sample t-test indicates a 0 out of 1 points strong relationship exists between the 2 population means. Selected Answer: Tru e Answers: True Fals e • Question 32 The arithmetic average of the data is called the: Selected Answer: Mean Answers: 1 out of 1 points Mean Median Mode Variabili ty • Question 33 1 out of 1 points Positive relationships between two variables indicate that, as the score of one increases, the score of the other increases. Answers: Sample Population Median Group Complete selection • Question 40 A result that is probably not attributable to chance is: Selected Answer: Statistical significance Answers: Type I error Type II error Statistical significance In the semi-quartile range • Question 41 Correlation coefficients, r, range from -1.00 to +1.00. 1 out of 1 points 1 out of 1 points Selected Answer: Tru e Answers: Tru e False • Question 42 The standard deviation is: Selected Answer: The square root of the variance. Answers: The difference between the 3rd and 1st quartile. 1 out of 1 points The squared deviations from the mean. The difference between the highest and lowest scores. The square root of the variance. • Question 43 1 out of 1 points The assumptions for ANCOVA differ substantially from those for ANOVA. Selected Answer: Fals e Answers: True Fals e • Question 44 Parametric tests can be used with any type of data. 1 out of 1 points Selected Answer: Fals e Answers: True Fals e • Question 45 ANOVA assumes which of the following? Selected Answer: All of the above Answers: Random sampling Normal distribution Dependent variable is at least interval Three or more groups of independent variable All of the above • Question 46 1 out of 1 points In a negative relationship, as the score of one variable decreases, the score on the second variable decreases. 1 out of 1 points Selected Answer: Fals e Answers: True Fals e • Question 47 1 out of 1 points In a study that examines the effect of a peer mentor on the heart rate of patients, what is the dependent variable? Selected Answer: Heart rate Answers: Peer mentoring Emotional status Heart rate Patients • Question 48 1 out of 1 points Relevant data that are expressed in numerical form are called: Selected Answer: Quantitative data Answers: Qualitative data Quantitative data Standard data Multiplicative data • Question 49