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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A: Solution
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A: Given that If you wish to test the claim that the mean of the population is 100. Note:- The null…
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Q: You are a research assistant at a zoo. The question of your study is "Has the proportion of baby…
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A: Here the direction of the test is to the left.
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A: Here Given When a null hypothesis is rejected, test is said to be "statistically significant
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A: HypothesisThe P-value=0.27
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A: Given Information: Population mean (u) = 4.3 Standard size (s) = 0.574 Sample size (n) = 31 Level…
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Q: reject the null hypothesis in favor of an alternative hypothesis at the 5% level of significance.…
A: It is known that if the p-value is less than the level of significance, the null hypothesis gets…
Q: You wish to test the following claim (Ha) at a significance level of a = 0.01. H.:P1 Ha:P1 7 P2 = P2…
A: Given,n1=200 , p^1=0.36n2=500 , p^2=0.42H0:p1=p2Ha:p1≠p2
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A: For the given data, we need to test whether a subject lies is independent of the polygraph test…
Q: Suppose that for a particular hypothesis test, the consequences of a Type I error are very serious.…
A: Here given that for a particular hypothesis test, the consequence of a Type I error are very…
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Q: D. What is the conclusion based on the hypothesis test? Since the P-value is ( ) the significance…
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Q: how many of the 200 tests, using a significance level of 5%, will incorrectly find significance
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A: From the given information, Population mean = 45 Sample mean = 42.5 Sample size =70 Standard…
Q: You are a research assistant at a zoo. The question of your study is "Has the proportion of baby…
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Q: S Click here for the Excel Data File a. Specify the competing hypotheses in order to determine…
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A: Null and Alternate Hypothesis: H0: μA- μB=100HA: μA- μB>100 We will need: Sample size A =nA…
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Q: In testing hypotheses, if the consequences of rejecting the null hypothesis are very serious (when…
A: The question is related to the size of the level of significance.
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A: If the P-value of a test of significance is 0.999 then:A. the null hypothesis should be rejected.B.…
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- A graduate student is interested in how viewing different types of scenes affects working memory. For his study, he selects a random sample of 36 adults. The subjects complete a series of working memory tests before and after walking in an urban setting. Before the walk, the mean score on the test of working memory was 9.1. After the walk, the mean score was 1.4 higher. The graduate student has no presupposed assumptions about how viewing different types of scenes affects working memory, so he formulates the null and alternative hypotheses as: H00 : μDD = 0 H11 : μDD ≠ 0 Assume that the data satisfy all of the required assumptions for a repeated-measures t test. The graduate student calculates the following statistics for his hypothesis test: Mean difference (MDD) 1.4 Estimated population standard deviation of the differences (s) 1.6 Estimated standard error of the mean differences (sMDMD) 0.2667 Degrees of freedom (df) 35 The t statistic 5.25 The critical values of t…A researcher gathered a sample of participants who volunteered for a studying of phobias. She measured anxiety level of participants as they viewed photos of spiders and again when they viewed puppies. Which statistical test is appropriate for this study and why?In conducting a significance test, is it easier or harder to reject the null hypothesis when it's a two-tailed test instead of a one-tailed test? A: easier B: harder
- Classify the hypothesis test as two-tailed, left-tailed, or right-tailed. At one school, the average amount of time that tenth-graders spend watching television each week is 20.1 hours. The principal introduces a campaign to encourage the students to watch less television. One year later, the principal wants to perform a hypothesis test to determine whether the average amount of time spent watching television per week has decreased from the previous mean of 20.1 hours.You wish to test the following claim (Ha) at a significance level of a = 0.02. H.:µ1 – µ2 =0 Ha:µ1 – P2 > 0 || You obtain the following two samples of data. Sample #2 Sample #1 61.3 63.5 47.7 51.2 52 39.2 59.7 53.3 54.7 51 54.2 45.5 55.6 46.6 65.3 33 54 48.4 46.6 49.2 65.8 58.6 53.4 49.4 54 54.7 67.7 41.4 47.1 46.1 34 55.4 57.7 55.5 40.7 54.2 Do not test the sample variances using Fcdf. Assume the sample variances are not equal and DO NOT POOL. 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? For this calculation, use the degrees of freedom reported from the technology you are using. (Report answer accurate to four decimal places.) p-value = The p-value is... Oless than (or equal to) a Ogreater than aA poll was conducted to investigate opinions about global warming. The respondents who answered yes when asked if there is solid evidence that the earth is getting warmer were then asked to select a cause of global warming. The results are given in the accompanying data table. Use a 0.01 significance level to test the claim that the sex of the respondent is independent of the choice for the cause of global warming. Do men and women appear to agree, or is there a substantial difference? identify the null and alternative hypothesis What is the test statistic? What is the p-value? What is the critical value? Human activity Natural patterns Don't know Male 343 150 28 Female 356 173 30 Chi-Square Degrees of Freedom 0.995 0.99 0.975 0.95 0.90 0.10 0.05 0.025 0.01 0.005 1 - - 0.001 0.004 0.016 2.706 3.841 5.024 6.635 7.879 2 0.010 0.020 0.051 0.103…
- A political scientist claims that 38% of first-year college students characterize themselves as being “moderate” or “middle of the road” as far as their political affiliation is concerned. Believing this claimed value is too high, you survey a random sample of 400 first-year college students and find that 120 characterize themselves as being “moderate” or “middle of the road.” Based on this information, what will the test statistic be? Choose the answer below that is closest to what you calculate, and try not to do a lot of rounding until you get to the very end of your calculations. 1. -0.3 2. -1.2 3. -2.6 4. -3.3 5. None of the other answer options are correct because the test statistic should be positive, not negative.If alpha is .10 in a two-tail hypothesis test, what is your decision rule for rejecting a null that the population mean is 200 if you use the Z test?Suppose we want to test whether or not three means are equal. We want to perform this test with a 8% significance level. If we perform an ANOVA test, what is the probability of the test producing accurate results (avoiding a Type I error)? Suppose we, instead, run three separate hypothesis tests (t-tests), each with 8% significance level. Mean 1 = Mean 2 Mean 1 = Mean 3 Mean 2 = Mean 3 What is the probability that all three tests would be accurate? Hint: use principles of probability to help your calculations: P(accurate AND accurate AND accurate) (Write your answer accurate without rounding.) Why would we use ANOVA instead of three separate tests? Why would we want to use three separate tests instead of ANOVA?
- A one-sided hypothesis test is to be performed with a significance level of 0.05. Suppose that the null hypothesis is false. If a significance level of 0.01 were to be used instead of a significance level of 0.05, which of the following would be true? A B O E Neither the probability of a Type Il error nor the power of the test would change. Both the probability of a Type II error and the power of the test would decrease. Both the probability of a Type Il error and the power of the test would increase. The probability of a Type II error would decrease and the power of the test would increase. The probability of a Type Il error would increase and the power of the test would decrease.The table below includes results from polygraph (lie detector) experiments conducted by researchers. In each case, it was known if the subjected lied or did not lie, so the table indicates when the polygraph test was correct. Use a 0.05 significance level to test the claim that whether a subject lies is independent of the polygraph test indication. Do the results suggest that polygraphs are effective in distinguishing between truth and lies? Determine the test statistic. (Round ofd to 3 decimal places) Find the P-Value What is the conclusion? (In case you are using excel, I will appreciate if you explain the steps of finding the test statistic and the P-value....But this is not a must)A psychologist wanted to study the effect of television violence on cortisol levels in the blood (high scores indicate high levels). The psychologist measured cortisol levels in seven participants before and after the participants watched a violent show. Participants' cortisol level scores are listed below. The researcher is interested if there is a change in the cortisol levels after watching the violent show. Carry out a t test for dependent means (using the .01 significance level). What should the researcher conclude? a.) Use the five steps of hypothesis testing. Label all the steps clearly. Show ALL work/calculations. b.) Report the statistic in APA format (the statistical sentence). Cortisol Levels in Blood Before and After Watching Violent Show Participant Before After A 3 3 B 15 3 9 6 D 6 8 E 8 F 4 1 Type here to search E I O KO 112 prt sc & * 6 E R T S G K V. alt alt 目 B.