You would first reject the same test statistic x at a higher significance level if the degrees of freedom were higher. True False
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- The table below summarizes the results of a survey in which randomly selected people were asked how they felt about the use of marijuana for medical purposes. A chi-square test at a significance level of 5% is used. Feelings on Medical Marijuana In Favor Opposed Undecided Gender: Male: 538 167 29 Female: 557 186 31 What would the null hypothesis be? a. Feelings on Medical Marijuana and gender are dependent. b. Feelings on Medical Marijuana and gender are independent.. If a hypothesis test is a two-tailed test and the test statistic is t = 2.687 when n = 19, what is the P-value of the test? Must also show picture with degrees of freedom.Ruby, a bowler, has a sample game score mean of 125.8 from 25 games. Ruby still claims that her average game score is 140, and the low average can be attributed to chance. At the 5% significance level, does the data provide sufficient evidence to conclude that Ruby's mean game score is less than 140? Given the sample data below, accept or reject the hypothesis. a 0.05 (significance level) 20-0.52 P 0.3015 Select the correct answer below: O Reject the null hypothesis because the value of z is negative. O Do not reject the null hypothesis because |-0.52| 0.05 O Reject the null hypothesis because the p-value 0.3015 is greater than the significance level a 0.05 O Do not reject the null hypothesis because the p-value 0.3015 is greater than the significance level a 0.05 O Reject the null hypothesis because |-0.521 > 0.05.
- In a study on the effect of sleep deprivation on pilots’ flight performance, 10 pilots were tested on a flight simulation after 12 hours of sleep deprivation, tested again after 24 hours, and tested once more after 36 hours. The dependent variable was the number of flight decision errors made by the pilots during each test. 1. Which statistical test should be used to analyze the data? Be specific. Why should this particular test be used? What are the degrees of freedom for the comparison distribution? What is the critical value of the test statistic (a = .05)? You run the test and find that F = 9.92. What do you || %3D obt conclude about the effect of sleep deprivation on flight performance?RECIDIVISM Report a Chi-Square test of Independence and use a 5% significance level. Explain the potential error in words, in context. Group of answer choices We would be accepting that there was an association between Recidivism and Treatment, when there was none. We would not be accepting that there was an association between Recidivism and Treatment, when there was indeed none. We would be not accepting that there was an association between Recidivism and Treatment, when there actually was one. We would be accepting that there was an association between Recidivism and Treatment, when there was indeed one.An analysis of variance experiment produced a portion of the accompanying ANOVA table. (You may find it useful to reference the E table.) S Click here for the Excel Data File a. Specify the competing hypotheses in order to determine whether some differences exist between the population means. Hg: HA = HB = HC = HD; HA: Not all population means are equal. O Hg: HA 2 µB 2 µC 2 HD; HA: Not all population means are equal. O Hg: HA < pB < HC 3 HD; HA: Not all population means are equal. b. Fill in the missing statistics in the ANOVA table. (Round intermediate calculations to at least 4 decimal places. Round "MS" to 4 decimal places and "F" to 3 decimal places.) ANOVA Source of Variation df MS F p-value Between Groups 19.75 3 0.0028 Within Groups 94.86 74 Total 114.61 77 c. At the 1% significance level, what is the conclusion to the test? O Reject Ha, we can conclude that some means differ. O Do not rcicct He- wc cannot conclude that somo mcans differ
- What is the null hypothesis, alternative hypothesis, p value, and the interpretation of the p value in our everyday words ?Explain how the P-value is obtained for a one-mean z-test in case the hypothesis test is a. left tailed. b. right tailed. c. two tailed.We surveyed the same group of employees once in the Fall and once in the Spring on their job satisfaction. Using the following dataset, conduct a test to determine if they differ significantly. What is the null hypothesis? Conduct the appropriate significance test. Please tell me what the result means in your own words. Fall Spring 8 5 5 1 6 4 5 4 8 7 5 6 10 8
- For a hypothesis test, if the p-value for the test statistic is less than the significance level, which one of the following is a correct conclusion? Group of answer choices Reject the null hypothesis. There is enough evidence to conclude the alternative hypothesis is true. Fail to reject the null hypothesis. There is enough evidence to conclude the null hypothesis is true. Reject the null hypothesis. There is not enough evidence to conclude the alternative hypothesis is true. Fail to reject the null hypothesis. There is not enough evidence to conclude the alternative hypothesis is true.Suppose you repeated your hypothesis test over and over again with many different data sets. Which of the following statements is true? The significance levels would change and so would the p-values. The significance level would stay the same but the p-values would change. The significance level would stay the same and so would the p-values. The significance levels would change but the p-values would stay the same.You wish to test the following claim (Ha) at a significance level of a = 0.01. H.: u = 78.5 H.:u < 78.5 You believe the population is normally distributed, but you do not know the standard deviation. You obtain the following sample of data: data 64.5 63.5 72.4 68.2 58.3 65 What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic = What is the p-value for this sample? (Report answer accurate to four decimal places.) p-value = The p-value is... O less than (or equal to) a O greater than a