Independent random samples are selected from two populations. Below are selected summary statistics. Pop. Mean Stand. Dev. Sample size 73.00 10.00 14 62.50 6.00 8 (a) Construct the 95% confidence interval for Hx - HY. (b) Obtain the P-value for the alternative 12
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- Decide which of the following statistical procedureswould most likely be used to answer the research questions posed:a independent samples t-testb analysis of variancec single sample t-testd paired samples t-teste construct a confidence interval 14. Do scores on a test of science achievement differ for female and male 8th grade students? 15. A group of office mates decide to go on a diet. They each measure their weight pre-diet and providetheir ideal weight. After the dieting plan a few months later, each person is weighed. Is there a differencepre-dieting and post dieting?AVOWA OPO. 000 8 C00 ar 000.98 000 S 000.8M 000.0 38.5; sample standard deviation (Sx) = 8; N = 22. 3. Compute a confidence interval (95% interval, 2-tailed) for a mean. Data: sample mean (X) = %3D %3DThe following random sample was selected from a normal distribution: 16 8 2 11 9 8 12 13 1 20 (a) Construct a 90% confidence interval for the population mean . OSH≤O (b) Construct a 95% confidence interval for the population mean μ. Osasl
- A random sample of 50 roundtrip flights between New York and Chicago has an average airfare of $400 with a sample standard deviation of $50.0. The critical value for an 95% confidence interval around this sample mean is ________.Answer (1.32, 10.68), (1, 11)One-Way Airfares The average one-way airfare from Pittsburgh to Washington D.C. is $236. A random sample of 19 one-way fares during a particular month had a mean of $208 with a standard deviation of $43. At α=0.05, is there sufficient evidence to conclude a difference from the stated mean?
- 5.1 & 6.2 Question 13, 6.1.34 Part 1 of 2 Use the confidence interval to find the estimated margin of error. Then find the sample mean. HW Score: 44.29%, 15.5 of 35 O Points: 0 of 1 A store manager reports a confidence interval of (44.8,83.8) when estimating the mean price (in dollars) for the population of textbooks. The estimated margin of error is (Type an integer or a decimal.) Clear all his View an example Get more help - Q SearchSuppose a random sample of 400 is selected from a population with a standard deviation of 5. If the sample mean is 25, the 98% confidence interval to estimate the population mean is between ____________. 24.34 and 25.68 24.49 and 25.51 24.42 and 25.58 24.75 and 25.26 24.76 and 25.25The mean ACT score for 43 male high school students is 21.1 and the standard deviation is 5.0. The mean ACT score for 56 female high school students is 20.9 and the standard deviation is 4.7. At the 1% significance level, can you reject the claim that male and female high school students have equal ACT score averages? Be sure to use the p-value to make your conclusion.
- Choose the appropriate statistical test. When computing, be sure to round each answer as indicated. A dentist wonders if depression affects ratings of tooth pain. In the general population, using a scale of 1-10 with higher values indicating more pain, the average pain rating for patients with toothaches is 6.8. A sample of 30 patients that show high levels of depression have an average pain rating of 7.1 (variance 0.8). What should the dentist determine? 1. Calculate the estimated standard error. (round to 3 decimals). [st.error] 2. What is thet-obtained? (round to 3 decimals). 3. What is the t-cv? (exact value) 4. What is your conclusion? Only type "Reject" or Retain"Seven pilots were tested in a flight simulator, and the time taken (in seconds) for each of them to complete a certain corrective action was measured and given as follows. 5.2 7.9 7.6 4.3 4.8 3.6 9.0 Construct a 99% confidence interval for the standard deviation of the true variability for the time taken to complete the corrective action.which of the following sample data: sample size= 100 sample mean= 340z/hr sample variance= 90z/ hr construct a 98% confidence interval for μ. the population mean is what?