Ohio State, STAT 135

Excerpt: ... Note: All of the course learning objectives are given in one document on myStat135. Here are the objectives related to Experimentation the topic of chapters 5 & 6 of the text and of labs 2 and 3. Bolded objective is the one to be used for the Lab re ...

Maryland, MATH 100

Excerpt: ... Midterm 3BStat 100Spring 1997 You may use calculators, and ONE page of notes (writing allowed on both sides). Each problem is worth 20 points. Different parts of a problem have equal weight unless otherwise indicated. Do not spend too much time on any one problem. Put a box around the final answer to a question. 1. In a sample of 100 bottles of a new brand of beer, the mean alcohol content was 5.1% with standard deviation 0.5% . Does this data provide strong evidence that the average alcohol content for this brand is different from 5%? To this end, a. b. c. d. Formulate the null and the alternative hypotheses. Define the appropriate test statistic. Give the form of the decision procedure at level of significance . Calculate the P-value for the sample mean found above and determine for which the null hypothesis is retained. 2. Suppose we have the following random sample of 6 observations from a normal population: 16, 14, 12, 8, 10, 6 For this data, the sample mean is 11 and the sample standard deviation i ...

Cal Poly, STAT 221

Excerpt: ... STAT 221 Investigation 1 a) The observational units are the children. b) The explanatory variable is the lighting in the child's room. The response variable is the eyesight of the child. Both are categorical. c) This is an observational study. The lighting condition was not imposed on the children by the researchers; it was just observed. d) Of the children in darkness, 18/172 = .105, or 10.5% were near-sighted. Of the children with a night light, 78/232 = .336, or 33.6% were near-sighted. Of the children with room light, 41/75 = .547, or 54.7% were near-sighted. e) 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% Darkness Night light Room light Far-sighted Normal refraction Near-sighted f) Yes. The data provide strong evidence that the more light that a child slept in, the more likely he/she was to be near-sighted. This is seen in the proportions in d) and in the segmented bar graph. g) No, it's not valid to conclude that light causes near-sightedness, because this is an observational study. One potential conf ...

Cal Poly, STAT 301

Excerpt: ... - Rossman, Chance, Cobb, Holcomb NSF/DUE/CCLI # 0633349 3 (m) Is this proportion small enough to consider the actual result obtained by the researchers surprising, assuming the null model that infants have no preference and so choose blindly? (n) In light of your answers to the previous two questions, would you say that the experimental data obtained by the researchers provide strong evidence that infants in general have a genuine preference for the helper toy over the hinderer toy? Explain. What bottom line does our analysis lead to? Do infants in general show a genuine preference for the nice toy over the naughty one? Well, there are rarely definitive answers in statistics, but our analysis reveals that the study provides strong evidence that infants in general do show a genuine preference for the helper over the hinderer. Why? Because our simulation analysis shows that we would rarely get data like the actual study results if infants really had no preference. The rese ...

Cal Poly, STAT 427

Excerpt: ... day of the study (so a negative score indicates a decrease in performance). The data are in the Minitab worksheet SleepDeprivation.mtw. a) Conduct a rank sum (Wilcoxon-Mann-Whitney) test of whether the data provide strong evidence that the sleep-deprived group tended to have lower improvements than the unrestricted sleep group. Show the details of the calculation of the test statistic by hand, and use the normal approximation to calculate the (approximate) p-value. b) Conduct a pooled t-test of whether the data provide strong evidence that the sleepdeprived group has a lower population mean improvement than the unrestricted sleep group. Report the sample means, sample standard deviations, test statistic, and p-value. [You may use Minitab.] c) Comment on how the p-values of the rank sum and pooled t-tests compare for these data. 5. a) Create a hypothetical example of 15 couples marriage ages with the property that a sign test produces a (one-sided) p-value less than .01 but a paired t-test produces a (onesi ...

Syracuse, PSY 205

Excerpt: ... PSY 205 EXAM 2 REVIEW CH 6, 7, 11, 16 STUDY LECTURE NOTES (ON BLACKBOARD) CHAPTER 6: LEARNING (ENTIRE CHAPTER) PRACTICE QUESTIONS 1. As a result of repeatedly opening a can of cat food with an electric can opener, your cat now comes running at the so ...

Cal Poly Pomona, MATH 04747

Excerpt: ... data. 3. Conduct a simulation to address the issue of statistical signicance: Do these data provide strong evidence that those on the sh oil diet experienced a greater reduction in blood pressure? Conduct one analysis to compare the mean reduction and another to compare the median reduction. 4. As part of your summary, include histograms of the sampling distributions for each of your analyses (one each for the analysis of mean reduction and the analysis of median reduction, 2 histograms total). 5. Summarize the conclusions that you can draw from this study, and explain the reasoning behind your conclusions. (Remember to mention to what larger population you can infer as well as whether your inference can be causal in nature.) ...

Michigan State University, CHAPT 8

Excerpt: ... Chapter 8 Hypothesis testing is a means by which statistical decisions are made. Example: To decide whether humans were capable of extrasensory perception (ESP)? Example 8.1 (Rhine's ESP experiments) In the 1930s J.B. Rhine and others conducted e ...

Cal Poly, STAT 252

Excerpt: ... g team scores in the entire game. (This phenomenon is known as a big bang.) Marilyn responded that this proportion seemed to be too high to be believable. Let be the proportion of all Major League Baseball games in which a big bang occurs. a) Restate the grandfathers assertion as the null hypothesis, in symbols and in words. b) Given Marilyns conjecture, state the alternative hypothesis, in symbols and in words. To investigate this claim, I randomly selected one week of the 2006 Major League Baseball season, which turned out to be July 31 August 6, 2006. Then I examined the 95 games played that week to determine which had a big bang and which did not. Of these 95 games in the sample, 47 contained a big bang. c) Calculate the sample proportion of games in which a big bang occurred. Use an appropriate symbol to denote it. d) Calculate the test statistic and p-value. e) Based on this p-value, would you say that the sample data provide strong evidence to support Marilyns contention ...

Michigan State University, ISP 205

Excerpt: ... Vocabulary in Content: Dark Matter WIMPS are defined as subatomic particles that have more mass than neutrinos but do not interact with light. A massive object can distort the light of more distant objects behind it through the phenomenon that we call gravitational lensing. An object the size of Earth located in the halo of our galaxy would be an example of the form of dark matter known as MACHOs. Matter made from ordinary atoms represents what we call baryonic matter. Models show that the large-scale structure of the universe is better-explained when we include the effects of dark matter along with the effects of luminous matter. The rotation curves of spiral galaxies provide strong evidence for the existence of dark matter. ...

Illinois Tech, MATH 149

Excerpt: ... <STUDYGUIDES08C.TXT> {5-9-2008} Math 149 Spring 2008 Final Study Guide, Part III - Chapter 6 Concept Check, p. 378: 1,2,3,4,5 Exercises: 1-6, 7-11, 12-16 Chapter 9 Concept Check, p. 598: 1 Exercises: 1, 3a, 7 ...