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Done 6 myopenmath.com AA 6 Chapter 9.1 Homework Score: 0/9 0/9 answered Progress saved Done (E) 110C. . Question 8 v E 0/1 pt 0 3 2 99 (9 Details A new beta-blocker medication is being tested to treat high blood pressure. Subjects with high blood pressure volunteered to take part in the experiment. 180 subjects were randomly assigned to receive a placebo and 210 received the medicine. High blood pressure disappeared in 100 of the controls and in 114 of the treatment group. Test the claim that the new beta- blocker medicine is effective at a significance level of a = 0.01. What are the correct hypotheses? H0: Select an answer 0 ? v Select an answer 0 Ha: Select an answer 0 ? v Select an answer C Based on the hypotheses, find the following: Test Statistic = (Round your answer to four decimal places.) p-value = (Round your answer to four decimal places.) The correct decision is to Select an answer 0 The correct summary would be: Select an answer C the claim that the new beta-blocker medicine is effective at a significance level of a l3 0/1 pt '0 3 8 99 G) Details You are testing the claim that the proportion of men who own cats is smaller than the proportion of women who own cats. You sample 140 men, and 35% own cats. You sample 120 women, and 85% own cats. Find the test statistic, rounded to two decimal places. Question Help: 8 Message instructor Submit Question i myopenmath.com Chapter 9.1 Homework Score: 0/9 0/9 answered Progress saved Done :31 wlc. 0 Question 1 v l3 0/1 pt '0 3 8 99 (D Details You wish to test the following claim (Ha) at a significance level of a : 0.10. Horpl :p2 Harm >192 The 1st population's sample has 120 successes and a sample size = 599. The 2nd population's sample has 68 successes and a sample size = 601. What is the test statistic (Z-score) for this sample? (Round to 3 decimal places.) test statistic = What is the p-value for this sample? (Round to 3 decimal places.) p-value = The p-value is... greater than a less than (or equal to) oz This test statistic leads to a decision to... fail to reject the null reject the null accept the null As such, the final conclusion is that... There is not sufficient sample evidence to support the alternate hypothesis claim that p1 > p2. The sample data support the alternate hypothesis claim that p1 > p2. Done 8 myopenmath.com AA 6 Chapter 9.1 Homework Score: 0/9 0/9 answered Progress saved Done (E) 116C. 0 Question 2 v E 0/1 pt 0 3 Z 99 (9 Details A random sample of m = 224 people who live in a city were selected and 104 identified as a "dog person." A random sample of 712 = 100 people who live in a rural area were selected and 56 identified as a "dog person." Find the 90% confidence interval for the difference in the proportion of people that live in a city who identify as a "dog person" and the proportion of people that live in a rural area who identify as a "dog person." Round answers to to 4 decimal places. 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. E 0/1 pt 0 3 Z 99 (9 Details Two samples are taken with the following numbers of successes and sample sizes T1=36T2=Z1 n1=60n2=66 Find a 95% confidence interval, round answers to the nearest thousandth. 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 6 myopenmath.com AA (3 Chapter 9.1 Homework Score: 0/9 0/9 answered Progress saved Done (3) wlc. 0 Question 3 v l3 0/1 pt '0 3 8 99 G) Details If the confidence interval for the difference in population proportions p1 p2 includes 0, then this suggests which of the following? 0 The first population proportion is less than the second. C) The first population proportion is greater than the second. C) The two population proportions might be the same.. O No comparison can be made between the two population proportions. Question Help: 8 Message instructor Submit Question '1 I > 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 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? myopenmath.com A teacher would like to determine if quiz scores improve after completion of a worksheet. The students take a pre-quiz before the worksheet and then another quiz after the worksheet. Assume quiz scores are normally distributed. The grades for each quiz are given below. Use a significance level of a = 0.05. Paired Two-Sample Means, Group 1 is the pre- quiz and group 2 is the post-quiz: Pre-Quiz Scores 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 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 = _ 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 5:39 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 E) 3 2 99 (D Details A new beta-blocker medication is being tested to treat high blood pressure. Subjects with high blood pressure volunteered to take part in the experiment. 170 subjects were randomly assigned to receive a placebo and 290 received the medicine. High blood pressure disappeared in 100 of the controls and in 199 of the treatment group. Test the claim that the new beta- blocker medicine is effective at a significance level of a = 0.01. What are the correct hypotheses? 0 H0: Select an answer 0 ? 0 Select an answer 0 H1: Select an answer 3 ? 3 Select an answer Based on the hypotheses, find the following: Test Statistic = p-value = The test statistic is: Select an answer 0 The correct decision is to Select an answer 0 The correct summary would be: Select an answer 0 the Claim that the new beta-blocker medicine is effective at a significance level of oz = 0.01. Question Help: 8 Message instructor Submit Question 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... less than (or equal to) oz greater than a This test statistic leads to a decision to... reject the null accept the null fail to reject the null As such, the final conclusion is that... There is sufficient evidence to warrant rejection of the claim that the mean difference of post-test from pre- test is less than 0. There is not sufficient evidence to warrant rejection of the claim that the mean difference of post-test from pre-test is less than 0. The sample data support the claim that the mean difference of post-test from pre-test is less than 0. There is not sufficient sample evidence to support the claim that the mean difference of post-test from pre- test is less than 0. i myopenmath.com C Question 8 v 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 9.1 Homework Score: 0/9 0/9 answered Progress saved Done (a) wlc. 0 Question 9 v IZO/1 pt '0 3 8 99 G) Details A National Cancer Institute study published in 1991 examined the incidence of cancer in dogs. Of 827 dogs whose owners used the weed killer 2-4-D on their lawns or gardens, 473 were found to have cancer. Only 19 of the 130 dogs that had not been exposed to this herbicide had cancer. Construct a 95% confidence interval for the difference in pets' cancer risk. Name the Interval: O 2 Sample T Interval O 2 Proportion Z Interval O 1 Proportion Z Interval O T Interval Create and Interpret the confidence interval: Interval : ( , ) Interpretation : Question Help: 8 Message instructor