All statistical hypothesis testing in social science research assumes an alpha level of: a. Interval ratio measured variables b. 0.05 c. 0.01 d. 0.000
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All statistical hypothesis testing in social science research assumes an alpha level of:
a. Interval ratio measured variables
b. 0.05
c. 0.01
d. 0.000
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- Scores on the Wechsler Adult Intelligence Scale are approximately normally distributed with 100 and σ=15. Use Table B or software to answer the following questions. What scores fall in the lowest 25% of the distribution? How high a score is needed to be in the highest 5%?A data set includes data from 400 random tornadoes. The display from technology available below results from using the tornado lengths (miles) to test the claim that the mean tornado length is greater than 2.3 miles. Use a 0.05 significance level. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim. Click the icon to view the display from technology. What are the null and alternative hypotheses? A. Ho: µ = 2.3 miles H1: µ 2.3 miles C. Ho: µ< 2.3 miles H1: µ= 2.3 miles D. Ho: µ = 2.3 miles H1: µ#2.3 miles Identify the test statistic. (Round to two decimal places as needed.) Identify the P-value. (Round to three decimal places as needed.) State the final conclusion that addresses the original claim. Ho. There is evidence to support the claim that the mean tornado length is greater than 2.3 milesA data set includes data from 400 random tornadoes. The display from technology available below results from using the tornado lengths (miles) to test the claim that the mean tornado length is greater than 2.8 miles. Use a 0.05 significance level. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim. Click the icon to view the display from technology. What are the null and alternative hypotheses? A. Ho: µ= 2.8 miles H1: µ> 2.8 miles B. Ho: µ = 2.8 miles %3D %3D H1: µ#2.8 miles C. Ho: µ = 2.8 miles D. Ho: µ< 2.8 miles H1: µ= 2.8 miles H1: µ<2.8 miles Identify the test statistic. (Round to two decimal places as needed.) Identify the P-value. (Round to three decimal places as needed.) State the final conclusion that addresses the original claim. Ho. There is evidence to support the claim that the mean tornado length is greater than 2.8 miles
- he quantitative data set under consideration has roughly a bell-shaped distribution. Apply the empirical rule to answer the following question. A quantitative data set has mean 20 and standard deviation 1. Approximately what percentage of the observations lie between 17 and 23?Safari File Edit View History Bookmarks Window Help Sun 10:16 A myopenmath.com МyOpenMath b Answered: What is a point estimate for the... | bartleby b Answered: An engineer wishes to determine the... | bartleby Suppose you are a researcher in a hospital. You are experimenting with a new tranqunizer. You collEtt data from a random sample of 11 patients. The period of effectiveness of the tranquilizer for each patient (in hours) is as follows: Hours 3 3 2.9 2.5 2.5 3 2.7 2.4 2.7 3 3 What is a point estimate for the population mean length of time. (Round answer to 2 decimal places) 2.79 What must be true in order to construct a confidence interval in this situation? The population must be approximately normal Construct a 90% confidence interval for the population mean length of time. (Round upper and lower bounds to 2 decimal places.) What does it mean to be "90% confident" in this problem? There is a 90% chance that the confidence interval contains the sample mean time. The confidence…INSTRUCTION: Choose the appropriate statistical test from the choices below and do not need an explanation. A. One-Sample t-Test B. Two-Sample t-Test C. Paired-Sample t-Test D. One-Way ANOVA E. Two-Way ANOVA F. Correlational Analysis G. Regression Analysis 1. What appropriate statistical test should be performed if a researcher would like to determine if there is a significant difference in the Systolic blood pressure (SBP) between Male and Female? 2. What appropriate statistical test should be performed if a researcher would like to determine if there is a significant difference in the Serum Creatinine (SCr) between "Under 60" and "60 and Above"? 3. What appropriate statistical test should be performed if a researcher would like to determine if there is a significant difference in the "Cholesterol" level before ("Pre") and after ("Post") the treatment or therapy? 4. What appropriate statistical test should be performed if a researcher would like to determine if there is a…
- Aspirin III: Decision and Conclusion Regarding the experiment in the data frame Aspirin from the abd package, the researchers wanted to know whether or not taking aspirin affects one's risk of developing cancer. Recall that they defined their parameters as follows: p1 = the proportion of ALL individuals who would develop cancer, if all of them were to take aspirin like the subjects in the Aspirin group did. p2 = the proportion of ALL individuals who would develop cancer, if all of them were to take a placebo, like the subjects in the placebo group did. They ran the code for a two-sided significance test and got the following results: ## ## ## Inferential Procedures for the Difference of Two Proportions p1-p2:## cancer grouped by treatment ## ## ## Descriptive Results:## ## yes n estimated.prop## Aspirin 1438 19934 0.07214## Placebo 1427 19942 0.07156## ## ## Inferential Results:## ## Estimate of p1-p2: 0.0005805 ## SE(p1.hat - p2.hat): 0.002586 ## ##…d. Sample variancee. Sample standard Deviationg. Eight DecileSE
- Do police officers who scored well on an aptitude test make better police officers? Use the following crosstabulation to do a chi-square test, and also calculate Gamma. What do the results tell us about the ability of the test to predict successful policing? Officer Aptitude Test Scores Officer Effectiveness Rating Low Medium High Totals Low 12 6 7 25 Moderate 9 11 9 29 High 5 9 10 24 Totals 26 26 26 78PERFORMANCE TASK : SOLVE FOR QUARTILES GROUPED DATA Scores Frequency cf 30-34 3 6. 8. 5 10-14 n =The data represents the heights of eruptions by a geyser. ← Use the heights to construct a stem and leaf plot. Is there strong evidence suggesting that the data are not from a population having a normal distribution? Which plot represents a correct stem and leaf plot of the data? O A. 910 10 0 1 3 689 110034 12 0 0 1 13 0 0 0 1 14 0 15 0 OB. 9/0 ⒸA. 6 B. 1 OC. 4 OD. 5 10 0 1 11 00001 12 03 6 89 13 0 0 3 4 14 01 15 0 O C. 9|001 10 0 18 11 0 0 3 12 0 0 9 13 0 0 6 14 034 15 0 1 If there were a 200 foot eruption, how many stems would it add to the chart above? Save Height of eruption (in.) 128 90 110 150 140 110 100 130 110 123 134 111 110 126 129 120 133 130 101 141 ww Incor