The accompanying table summarizes successes and failures when subjects used different methods when trying to stop smoking. The determination of smoking or not smoking was made five months after the treatment was begun. If we test the claim that success is independent of the method used, the technology provides a P-value of 0.003 (rounded). What does the P-value tell us about that claim? Click the icon to view the stop smoking data. What does the P-value tell us about that claim? Because the P-value of 0.003 V small (such as 0.05 or lower), V the null hypothesis of independence between the treatment and whether the subject stops smoking. This suggests that the choice of treatment

The accompanying table summarizes successes and failures when subjects used different methods when trying to stop smoking. The determination of smoking or not smoking was made five months after the treatment was begun. If we test the claim that success is independent of the method used, the technology provides a P-value of 0.003 (rounded). What does the P-value tell us about that claim? Click the icon to view the stop smoking data. What does the P-value tell us about that claim? Because the P-value of 0.003 V small (such as 0.05 or lower), V the null hypothesis of independence between the treatment and whether the subject stops smoking. This suggests that the choice of treatment

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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8:55 1 1 Student A imperial.instructure.com Experiment 1: You believe that caffeine can improve the capacity of short-term memory (STM). It is widely known that STM capacity 7 items (m=7)on average with a standard deviation of 2 items (s=2). You randomly sampled n=8 participants and have then drink a large quantity of coffee. Fifteen minutes later you administer a STM test to each participant and measure the number of items remembered. The data are shown below. Use these data to answer the following questions. Excel should be used to obtain the sample mean, standard deviation and standard error. Perform a 2-tailed z-test with a=0.05 to determine if caffeine influences memory. Number Participant of items 1 2 9 3 7 4 6 6 7 7 8 9
Please help me with the following question.
Captoril is a drug designed to lower systolic blood pressure. When subjects were treated with this drug, their systolic blood pressure readings (in mm Hg) were measured before and after the drug was taken. Use a sign test and a 0.01 significance level to test if there is a sufficient evidence to support the claim that captoril has an effect on systolic blood pressure. Subject A B C D E F G H I J K L Before 200 174 198 170 179 182 193 209 185 155 169 210 After 191 170 177 167 159 151 176 183 159 145 146 177 1. what is the tabular value? (Type as a whole number.) 2. what is the conclusion of the study? There is no effect hence the median of the differences is equal to 0. There is an effect hence the median of the differences is greater than 0. There is an effect hence the median of the differences is not equal to 0. There is an effect hence the median of the differences is less than 0.
Read through this scenario and look at the data that was collected. State the null and all possible research hypotheses. Review the results below (I used SPSS) and answer the questions that follow. Scenario: A researcher wants to see if gender and / or income affects the total amount of help given to a stranger who is sitting on the side of a busy road with a sign asking for help. The independent variables are gender, income, and the interaction of gender and income. The dependent variable is total help. He wants to know if one or both factors – or the interaction of the two - affects the total amount of help offered. Because he is analyzing two independent variables (gender and income), he used a factorial ANOVA. His results show the main effect of each of the independent variables on the dependent variable (total help) and the interaction effect. The researcher is using a 95% confidence interval which means that he wants to be at least 95% sure that his independent variables…
Does talking while walking slow you down? Suppose a study considered mean cadence (steps per minute) for subjects using no walking device, a standard walker, and a rolling walker. In addition, the cadence was measured when the subjects had to perform dual tasks. The second task was to respond vocally to a signal or respond to an interview question while walking. Cadence was measured for subjects who were just walking (using no walking device, a standard walker, or a rolling walker), for subjects required to respond to a signal, and for subjects required to respond to an interview question while walking. How many cells are there in the data table?
You have been hired by a local middle school to teach students about drugs and the harms of drug use. Being the statistician that you are, you want to see how effective your lecture is at increasing knowledge; therefore, you give them a pretest of 10 questions to measure their knowledge of drugs and the harms of drug use. After your lecture, you give the same students a posttest and measure their knowledge of drugs and the harms of drug use. BY HAND, Determine whether the students’ knowledge significantly increased as a result of your lecture. Use an alpha of .05. Pre Post 3 6 1 4 0 5 4 3 2 9 5 9 3 3 2 7 3 6 4 8
For each case below, state what type of statistical test you would use to analyze each dataset. Explain your answer! Hemoglobin is a protein responsible for carrying oxygen throughout your blood stream. Blood hemoglobin levels in humans average at about 14.5g/dL. We are interested in whether a sample of 20 iron deficient individuals have lower blood hemoglobin levels compared to the general population. The average hemoglobin level for our sample is 10.9g/dL, with an estimated population standard deviation of 1.92g/dL. A researcher is looking at whether the time it takes for rats to relearn how to run a maze decreases after they’ve been exposed to the maze more than once. Using 15 rats, he measures how quickly they are able to successfully run a maze at two different times points: once when they are first exposed to the maze, and again after they’ve run the maze three times. A social psychologist is curious about whether social rejection increases aggression in narcissists. He…
Find the z-score and p-value.
A researcher wanted to test whether death anxiety changes over time. She sampled 20 people and measured their death anxiety in high school, at age 40, and at age 55. Which of the following tests should she use? One-way between ANOVA Repeated measures ANOVA Correlation Chi-square
A new cream was developed to reduce the irritation caused by poison ivy. To test the effectiveness, researchers placed an ad online asking for volunteers to participate in the study. One hundred subjects replied and were informed that one group would receive the new cream and the other group would Which of the following accurately describes the benefit of comparison in the experiment? O The overall level of irritation can be compared to see if the new cream had a significant effect. O The level of irritation for both groups can be receive a cream with no active ingredient. All 100 subjects were exposed to poison ivy. Fifty were then randomly assigned to the group with the new cream, and 50 were randomly assigned to the group with the cream with no active ingredient. After three days, the subjects' level of irritation was measured. compared to see if the new cream had a significant effect. O The level of irritation in the treatment group only can be compared to see if the new cream had…
Cindy, a financial analyst is studying the relationship between family decisions to borrow money to finance a child’s education and the child’s expected income after graduation. To aid the study, 440 randomly selected families were surveyed with the results provided below. At alpha =0.01, can you conclude that the decision to borrow money is related to a child’s expected income after graduation? Expected income More Likely Less Likely Did not make a difference Did not consider it Less than $20,000 37 10 22 25 $20,000-$45000 28 12 15 16 $45000-$70000 55 9 65 48 Greater than $70000 36 1 29 32 What is the degrees of freedom? What is the critical value? Leave your answers in 4 decimal places The degrees of freedom is and the P- value is .
Each problem describes a research situation and the data it produces. Identify the statistical procedure or test that is appropriate for the data. Choose whether the problem requires one of the following: Descriptive statistics (Mean, Standard Deviations, Percentiles), one-sample t test, Independent-measures t test, Independent-measures ANOVAs (One-factor or Two-factor), Repeated-measures ANOVA, Linear Regression, Chi-Square Goodness-of-fit, Chi-Square Test of independence. 1) A researcher investigated different combinations of temperature and humidity to examine how heat affects performance. The researcher compared three temperature conditions (70º, 80º, and 90º) with a high humidity and a low humidity condition for each temperature. A separate group of participants was tested in each of the six different conditions. For each participant, the researcher recorded the number of errors on a problem-solving task. The researcher would like to know how different combinations of…