Distinguish between Alpha and Beta testing.
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Distinguish between Alpha and Beta testing.
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- Researchers investigate how the presence of cell phones influence the quality of human interaction. Subjects are randomly selected from a population and divided into an experimental group that is asked to leave their phones in the front of the room and a control group that are not asked to leave their cell phones at the front of the room. Subjects are left alone for 10 minutes and then asked to take a survey designed to measure quality of interactions they had with others in the experiment. What statistical test is appropriate?Taxi Brand A Brand B1 38,300 39,8002 37,700 38,1003 42,200 43,0004 42,300 41,6005 48,200 47,0006 36,100 40,4007 35,300 36,4008 44,600 45,900Scientists at a major pharmaceutical company investigated the effectiveness of an herbal compound to treat the common cold. They exposed each subject to a cold virus, then randomly gave him or her either the herbal compound they were testing the effectiveness of or a sugar solution known to have no effect on colds. Several days later, they assessed the patient’s condition, using a cold severity scale ranging from 0 to 5. They found no evidence of benefits associated with the compound. What was the independent (explanatory) variable in this study? A. The subject's ranking on the cold severity scale B. The days C. Whether the subject received the herbal compound or the sugar solution D. The cold virus
- A random sample of 100 male employees showed that 42 are working from home while a random sample of 100 female employees showed that 63 are working from home. Are the two population proportions equal? Test at alpha=0.05. What is Ho and Ha? And what is the test statistic value for this test? Based on the test statistic value, what is your decision?To examine the effects of pets and friends in stressful situations, researchers recruited 45 people to participate in an experiment. Fifteen of the subjects were randomly assigned to each of three groups to perform a stressful task alone (control group), with a good friend present, or with their dog present. Each subjects mean heart rate during the task was recorded. Higher heart rates mean more stress. Use an alpha of .05. Control Pets Friends n1=15 n2=15 n3=15 M1=82.52 M2=73.48 M3=91.33 s1=9.24 s2=9.97 s3=8.34 SS1=1195.29 SS2=1391.61 SS3=973.78 SSbetween = 2389.80 c) Complete the necessary calculations (include post hocs if necessary) .d) Report your results in APA styleAcne is a common skin disease that affects most adolescents and can continue into adulthood. A study compared the effectiveness of three acne treatments and a placebo, all in gel form, applied twice daily for 12 weeks. The study's 517 teenage volunteers were randomly assigned to one of the four treatments. Success was assessed as clear or almost clear skin at the end of the 12 week period. The results of the study can be seen in the table below. Using the appropriate statistical test, determine if there is significant evidence that the four treatments perform differently. If so, how do they compare.
- According to Time Magazine (June 11, 2012), 33% of all cars sold in the United States are SUV's. Suppose a random sample of 500 recently sold cars shows that 145 are SUV's. is there enough evidence at the 1% alpha level, to conclude that the number of SUV's recently sold is less than 33%? 1. Develop a plan. State the type of test you will do, and why you will do that specific test. 2. State your steps List your given information: List your H, and H, H Write H, in words: H₂ Write H, in words Check your conditions 3. Document all steps used to find your answer Compute all of the values you will use with appropriate formulas or using appropriate technology 4. Determine whether or not to reject H and write a concluding statement in context of the problem.A simple random sample of 95 basketball players is taken from different teams and their mean weight is found to be 226 pounds and the standard deviation of the population is 20 pounds. Using 0.05 level of significance, test the claim that the average weight for all basketball players is 231 pounds. Complete the following steps: Step # 1: Write the null hypothesis Ho [ Select ] and the alternative hypothesis H1 [ Select ] and identify the claim [Select] Step # 2: Indicate what type of test has to be used [Select ] and find the critical value(s). ( Select ] Step # 3: Find the test value. [ Select ] Step # 4: Make the decision about the null hypothesis. [ Select ] Step # 5: Summarize the result. (Select Jpls answer thankyou
- An experiment was conducted to test if 2 new anti-anxiety medications will have an effect on number of anxiety symptoms. The researcher randomly assigned participants to one of the three experimental groups. Groups 1 and 2 took the 2 new medications while Group 3 took a placebo pill. The researcher was interested in determining whether there would be a difference in the number of anxiety symptoms among the three groups. Assume an alpha level of 0.05 and a two-tailed test. What statistical test should you use to evaluate the hypothesis above? one-way independent ANOVA Pearson Product-Moment Correlation simple linear regression multiple linear regression three-way independent ANOVAThe SSRUR = 161.9, SSRR = 260.6, number of restrictions = 2, n = 89, and there are 8 right hand side variables. Calculate the F statistic.
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