Statistical power

Hypothesis test How to find the sample size for analytical studies and experiments? State the null and alternative hypothesis. Choose the statistical test based on the type of predictor and outcome variables. Choose an appropriate effect size. Set type 1 (alpha) and type 2 (beta) error. Use the appropriate table to to look for the corresponding sample size. Basic Concepts Hypotheses: Null and Alternative hypotheses People often look into statistical relationship through the test of significance. It is a procedure by which clinicians collect information and see if it agrees with their initial hypothesis. Hypothesis tests are often used for comparison of two samples from the same pool. While the null hypothesis (H0) agrees both could have…

A within subject’s experimental design, compared the perceived differences in length of different sized paperclips on different body parts. The perceived distance of the paperclips, were rated on a scale of 0 to 2; zero meaning equal, one meaning shorter and two meaning longer. There were three conditions; the Finger-Wrist condition, the Finger-Forearm condition, and the Wrist-Forearm condition. 20-psychology students participated in the study. All 20 participants participated in all three…

possibly result in lawsuits against the drug manufacturer. Question 3 Statistical significance relates to the size of an effect. If an observed effect is larger than it would be due to chance alone, the effect is termed as statistically significant. Therefore, a statistically significant finding implies that the difference observed between two or more variables is larger than would be observed if it was a result of chance. For instance, if a manager finds a statistically significant difference…

Question 1 Cowles and Davis (2016) discussed several factors that contributed to the adoption of the .05 level of statistical significance. The first factor discussed was the discovery that computations can be utilized to measure observational error, by and astronomer, Lambert Adolphe Quetelet. This discovery led to the development of the normal distribution curve utilized today (Cowles & Davis, 2016). Following the development of the normal distribution curve, a measure of variability known…

aimed to investigate the efficacy and safety of prophylactic acetaminophen in children administered various types of injected vaccinations. Participants of the study were to be healthy, >4,000 g at enrollment, and within the age range of 56-112 days at the time of enrollment. Children were excluded if they were immunodeficient or immunosuppressed, had history of seizures or bleeding disorders, were previously vaccinated or given blood products, had intolerance to acetaminophen, or if their…

Chi- Square Goodness of Fit Testing Assuming Equal Expected A handful of students loves numbers and selects a major in Finance, Statistics, or Marketing. While others prefer a major in Leadership or are undecided. Historically, the MBA program at Whatsamatta U has about 40% of their students electing Leadership as their major, 30% selecting Finance as a major, 20% choosing Marketing, and 10% are undecided. Conducting a Chi-Square Goodness of the Fit Test revealed that the class of 200 students…

There was no significant correlation found between the Numeric and Spatial conditions, indicating there was no relationship between these two conditions. This means we need to accept the null hypothesis that there is no interaction between these two sets of conditions. It should be noted that even if we adopted a two-tail hypothesis, that the result would still be insignificant, however not by large degree (P=0.104). Previous research made a one directional hypothesis seem more appropriate, due…

However, the “abvavg” variable does indicate a positive relationship with the hourly wage – suggesting that more physically attractive individuals do experience a monetary benefit because of their appearance, but the variable is deemed statistically insignificant and the results hold no weight in the model. Instead, “belavg” displays a negative relationship with the hourly wage, which indicates that it is less physically attractive individuals that are experiencing a monetary disadvantage as a…

this particular research project. This computer program tests a subject’s mental state through a series of questions regarding his or her age, education, ethnic background, language fluency, sleep and so on. Proceeding the optional background questionnaire, the subject’s memory is tested through various picture memory tests. This information is then confidentially stored on an aggregated database. Nonspecific scores and anonymous demographic information is available for students to study.…

Results In order to examine the differences in metaphorical language use of the experimental group and the control group at the beginning of the metaphor awareness treatment, an independent samples t-test was conducted for the data gathered from the participants’ recent writing test. The statistical analysis indicated that there was not a significant difference in the metaphorical language use of experiment group (M = 1.59; SD = .70) and control (M = 1.44; SD = 1.00); t (43) = .58, p = .56.…