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5:39 Done myopenmath.com AA C Chapter 9.2 - 9.3 Homework Score: 0/11 0/11 answered Progress saved Done Vo O . . . Question 5 0/1 pt 9 3 99 0 Details Test the claim that the mean GPA of night students is larger than the mean GPA of day students at the 0.025 significance level. The null and alternative hypothesis would be: Ho: PN PD HO: PN 2 PD Ho : PN = PD H1 : PN > PD H1 :PN MD O The test is: left-tailed two-tailed right-tailed O O The sample consisted of 55 night students, with a sample mean GPA of 3 and a standard deviation of 0.05, and 55 day students, with a sample mean GPA of 2.98 and a standard deviation of 0.03. The test statistic is: (to 2 decimals)Done 8 myopenmath.com AA 6 Chapter 9.2 - 9.3 Homework Score: 0/11 0/11 answered Progress saved Done a) WC. . Question 3 v E 0/1 pt 0 3 8 99 (9 Details An interior decorator wants to compare the prices at 2 stores to see if their mean prices are significantly different. She gathers the prices at each store on the same 26 items (from bath mats to window curtains). o What kind of hypotheisis test is this? 0 2 Means Matched Pairs t-test O 1 Proportion z-test O 2 Proportions z-test O 2 Independent Means t-test O 1 Mean t-test I Which hypotheses do we want to test? Done 0 myopenmath.com AA 0 Chapter 9.2 - 9.3 Homework Score: 0/11 0/11 answered Progress saved Done (3) WC. 0 Question 9 v B 0/1 pt 0 3 8 99 (9 Details You wish to test the following claim (Ha) at a significance level of oz : 0.01. For the context of this problem, ,ud : p2 #1 where the first data set represents a pre-test and the second data set represents a post-test. Hozpd=0 Hal/1d > 0 You believe the population of difference scores is normally distributed, but you do not know the standard deviation. You obtain pre-test and post-test samples for n : 166 subjects. The average difference (post - pre) is d = 2.7 with a standard deviation of the differences of 3d : 49.4. What is the test statistic for this sample? (Report answer accurate to three decimal places.) test statistic = What is the P-value for this test? For this calculation, use the conservative under-estimate for the degrees of freedom as mentioned in the textbook. (Report answer accurate to four decimal places.) P-value = The P-value is... C) less than (or equal to) 04 Q greater than 04 Done 8 myopenmath.com AA 0 Chapter 9.2 - 9.3 Homework Score: 0/11 0/11 answered Progress saved Done (E) VEC. 0 Question 4 v B 0/1 pt '0 3 8 99 (9 Details You are testing the claim that the mean GPA of night students is different than the mean GPA of day students. You sample 60 night students, and the sample mean GPA is 2.93 with a standard deviation of 0.62 You sample 30 day students, and the sample mean GPA is 2.83 with a standard deviation of 0.59 Calculate the test statistic, rounded to 2 decimal places Question Help: 8 Message instructor Submit Question 2 pact myopenmath.com 19 20 5 11 7 9 11 13 9 14 7 7 8 10 9 12 14 13 14 14 0 8 15 18 6 7 What is the test statistic? test statistic = (Report answer accurate to 4 decimal places. ) What is the p-value for this sample? p-value = (Report answer accurate to 4 decimal places.) The correct decision is to Select an answer The correct summary would be: Select an answer that the worksheet did improve the average quiz scores. Question Help: Message instructor Submit Question5:39 Done myopenmath.com AA Chapter 9.2 - 9.3 Homework Score: 0/11 0/11 answered Progress saved Done Vo . . . Question 1 E 0/1 pt 0 3 8 99 G) Details Quick note for SPSS users: To get SPSS to run the analysis in the correct \"direction\" from the Analyze > Compare Means > PairedSamples T Test... protocol, please enter the after variable first, and the before variable second. (SPSS analyzes using first variable minus second variable.) You wish to test the following claim (Ha) at a significance level of oz : 0.05. For the context of this problem, lid 2 p2 m where the first data set represents a pre-test and the second data set represents a post-test. Horpdz Hazpd E 0/1 pt 0 3 Z 99 G) Details For each scenario listed on the left, determine whether the scenario represents an Independent Samples or Matched pairs situation by placing the appropriate letter in the box provided. - 0 Comparing the number of speeding tickets received by men to the number received by women - 0 Comparing pain levels of a group receiving a placebo to a group receiving a medicine - 0 Comparing pre-test scores before training to post-test scores - 0 Comparing pain levels before and after treatment with magnetic therapy a. Independent Samples b. Matched Pairs Done 6 myopenmath.com AA 6 Chapter 9.2 - 9.3 Homework Score: 0/11 0/11 answered Progress saved Done (3) wlc. 0 Question 2 v IZO/1 pt '0 3 8 99 G) Details A study of working actors looked at age and gender. One sample of 60 male actors had a mean age of 26 and a standard deviation of 2. The other sample included 60 female actors with a mean age of 23 and a standard deviation of 4. Estimate with 99% confidence the difference between the average ages of working male (M1) and female (#2) actors. Round answers to the nearest hundredth. H myopenmath.com A manager wishes to see if the time (in minutes) it takes for their workers to complete a certain task will increase when they are allowed to wear ear buds at work. A random sample of 8 workers' times were collected before and after wearing ear buds. Assume the data is normally distributed. Perform a Matched-Pairs hypothesis test for the claim that the time to complete the task has increased at a significance level of oz : 0.05. If you wish to copy this data to a spreadsheet or StatCrunch, you may find it useful to first copy it to Notepad, in order to remove any formatting. Round answers to 4 decimal places. For the context of this problem, ,ud : \"After - ,u_Before, where the first data set represents "after" and the second data set represents "before". H0 3 'LLd I 0 Ha:,ud > 0 This is the sample data: 33 What is the mean difference for this sample? Mean difference = What is the significance level for this sample? Significance level = What is the P-value for this test? P-value = This P-value leads to a decision to... Select an answer 0 I4 6 myopenmath.com A researcher takes sample temperatures in Fahrenheit of 16 days from San Francisco (Group 1) and 18 days from Orlando (Group 2). Test the claim that the mean temperature in San Francisco is different than the mean temperature in Orlando. Use a significance level of oz : 0.05. Assume the populations are approximately normally distributed with unequal variances. You obtain the following two samples of data. Round answers to 4 decimal places. San Francisco Orlando .5: What are the correct hypotheses? Note this may view better in full screen mode. Select the correct symbols for each of the 6 spaces. A A H02 Select an answer v ? v Select an answer v H12 Select an answer 3 ? v Select an answer 3 Based on the hypotheses, find the following: Test Statistic = p'Vaer = _