Which of the following is the null hypothesis? Those alone will not differ in their pulling strength compared to those in the together condition The two groups WILL differ
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Q: 4 2 1 6 2 4 32 2 1 3 4 2 Complete step 3 of the hypothesis testing procedure and calculate t using…
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Q: g. With which p level-0.05 or 0.01 reject the null hypothesis? Explain.
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Q: What is the null hypothesis in the Wilcoxon Signed-Ranks Test?
A: Given information: Wilcoxon Signed-Ranks Test
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A: Given data: Drug group: 8, 2, 3, 5 Placebo group: 3, -5, -2 Nothing group: -1, -3, -2
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Q: Suppose you are a researcher for a clinical trial testing a new antidepressant drug called Joyzepam.…
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A: 1 State the mad scientist’s null and alternative hypotheses 2 Find the critical r
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Q: What is the difference between the Wilcoxon Signed-Ranks Test and the Mann-Whitney U Test?
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Q: Using a matched-group design is especially important in which of the following cases? a. When you…
A: Answer is below
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- A group of psychologists wants to see if a 10-week self defense training program will increase the self-esteem of an adolescent student being bullied by classmates. Describe the two populations of interest and write both directional and non-directional research hypothesis with the corresponding null hypothesis for this study.A neurosurgeon believes that lesions in a particular area of the brain, called the thalamus, will decrease pain perception. If so, this could be important in the treatment of terminal illness that is accompanied by intense pain. As a first attempt to test this hypothesis, he conducts an experiment in which 16 rats are randomly divided into two groups of eight each. Animals in the experimental group receive a small lesion in the part of the thalamus thought to be involved with pain perception. Animals in the control group receive a comparable lesion in a brain area believed to be unrelated to pain. Two weeks after surgery, each animal is given a brief electrical shock to the paws. The shock is administered in an ascending series, beginning with a very low intensity level and increasing until the animal first flinches. In this manner, the pain threshold to electric shock is determined for each rat. The following data are obtained. Each score represents the current level (milli-amperes)…A toll collector wonders if drivers are equally likely to choose each of the three lanes at his toll booth. He selects a random sample of 465 drivers that approach the booth when all three lanes are empty, so that the driver's choice isn't influenced by the cars already at the booth. The table below summarizes the data: Lane Left Center Right Number of drivers 137 159 169 Which of the following is an appropriate alternative hypothesis for addressing this question? Drivers are not equally likely to choose each of the three lanes O The observed number of drivers choosing each lane is equal. The observed number of drivers choosing each lane is different from the expected numbers. The proportion of drivers choosing each of the three lanes are equal. O The proportion of drivers choosing each of the three lanes are all different.
- “A researcher wants to examine the effects of siblings on the amount of annual salary people earned when they are 35 years old. Salary data of three groups of 35-year olds were collected and are presented here. 4 participants with no sibling while growing up (n1 = 4): 50K, 51K, 49K, 50K. 5 participants with 1 to 2 siblings while growing up (n2 = 5): 55K, 56K, 54K, 58K, 52K. 4 participants with 3 and more siblings while growing up (n3 = 4): 60K, 60K, 70K, 50K. The researcher calculated: ∑x2 = 39747, G2/N = 39325, ∑T2/n = 39525.” Do the data indicate significant differences among the three groups of 35-year olds? Test at the alpha = .05 level. a. No, the calculated F value was not larger than the critical F value; results were not statistically significant and fail to reject the null hypothesis. b. Yes, the calculated F value was not larger than the critical F value; results were not statistically significant and fail to reject the null hypothesis. c. Yes,…Kllustration 20.23. 1600 families were selected at random in a city to test the belief that high income families usually send their childeren to public schools and low income families often send their children to Governments schools. The following results were obtained. School Public Govt. Total Income Low High 494 162 506 438 1000 600 Total 656 944 1600 Test whether income and type of school are independeGnt.A social psychologist hypothesized that a white person is more likely to cooperate with another person than a black person in a task requiring cooperation (this would be considerate an alternative hypothesis). To test this idea he conducted an experiment in which white subjects either worked on a task with a white person or black person (both of these “others” were confederates of the experimenter). Thirty-one subjects were randomly assigned to the “white-other” treatment (say this is treatment 1) and 31 were randomly assigned to the “black-other” treatment (this is treatment 2). If the mean cooperation scores, on a scale from 0 to 20, were 14 for those subjects in the “white-other” treatment and 12 for those in the “black-other” treatment, run an appropriate test to test the social psychologist’s hypothesis. Let us further say that the variance for the cooperation measure for the “white-other” treatment was = 2.48 and the variance for the “black-other” treatment was = 2.52. Use =0.05…
- Q.6.2 The financlal manager of a natlonal warehouse chaln has found from prevlous experlence that 45% of clients pay by credit card, 35% pay on account, whille the remainder pay using cash. He wishes to know if this is still the case. A random sample of 1000 sales receipts from the last month produced the following results: Payment Method Credit Card Account Cash Total Number of receipts 500 315 185 1000 Using a 1% significance level, test whether the payment method pattern has changed.A hypothesis was tested twice using a two - tailed z- test. The first test was done with a 5% significance level while the second test using a 10% significance level. If the test stastic for both tests is - 1.75, which of the following is true? A At 5% and 10% alpha level, the null hypothesis is accepted B The null hypothesis is rejected at 5% and accepted at 10% C The null hypothesis rejected for both tests At 5% the null hypothesis is accepted and rejected at 10%were Classified 2. Pg, 36-7, 1.4.33. At the beginning of a Study individuals, 3% were Classified as heavy Smokers, 25.1. Smokers, and 72% were classified as as light In the 5 year study, it was determined. that the death rates of the heavy and light Smokers were 6 and 3 times that of non smokers. non- of Smokers, respectively. A randomly selected Participant died over the Syear period: Calculate the probability that the participant а nonsmorcer? was
- An elementary school claims the variation in reading scores of its fourth grade students is less than o = 3. 25. Determine whether the hypothesis for this claim is left-tailed, right-tailed, or two-tailed. left-tailed right-tailed two-tailedThe news release referenced in the previous exercise also included data fromindependent samples of teenage drivers and parents of teenage drivers. In response to aquestion asking if they approved of laws banning the use of cell phones and texting whiledriving, 74% of the teens surveyed and 95% of the parents surveyed said they approved.The sample sizes were not given in the news release, but suppose that 600 teens and 400 parents of teens were surveyed and that these samples are representative of the twopopulations. Do the data provide convincing evidence that the proportion of teens whoapprove of banning cell phone and texting while driving is less than the proportion ofparents of teens who approve?11.1.5.2