Which of these research designs are used for national surveys? Cohort Cross-sectional Quasi-experimental Case-Control

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A brokerage firm wants to conduct a study to see if there is a linear relationship between the size of an account and the number of trades conducted each year. What would be the most appropriate procedure to use to analyze data to answer this question? Only choose a test that handles multiple comparisons if such a test is needed. O ANOVA (Analysis of Variance) O Regression Test of Slope or Correlation O Test for a Difference of Proportions O Chi-square test of association O Test for a Difference of Means

Statistical Laboratory  Link of dataset: https://www.kaggle.com/datasets/johnharshith/world-happiness-report-2021-worldwide-mortality Country name Population 2020 Population 2019 United States 331002647 328239523 Egypt 102334403 100388073 Morocco 36910558 36471769 Lebanon 6825442 6855713 Saudi Arabia 34813867 34268528 Jordan 10203140 10101694 Syria 17500657 17070135 Turkey 84339067 83429615 Pakistan 220892331 216565318 Indonesia 273523621 270625568 Bangladesh 164689383 163046161 United Kingdom 67886004 66834405 France 65273512 67059887 Germany 83783945 83132799 Netherlands 17134873 17332850 Belgium 11589616 11484055 Spain 46754783 47076781 Italy 60461828 60297396 Poland 37846605 37970874 Hungary 9660350 9769949 Czech Republic 10708982 10669709 Romania 19237682 19356544 Sweden 10099270 10285453 Greece 10423056 10716322 Denmark 5792203 5818553 Iran 83992953 82913906 Hong Kong S.A.R. of China 7496988 7451000 Singapore 5850343…

Which best illustrates the distinction between statistical significance and practical importance?     Multiple Choice   "This year, 360 of 440 statistics students at Oxnard Technical College rented their textbooks, compared with 110 of 330 students last year. This is a significant increase."     "Our new manufacturing technique has increased the life of the 80 GB USB AsimoDrive external hard disk significantly, from 240,000 hours to 250,000 hours."     "In 50,000 births, the new vaccine reduced the incidence of infant mortality in Morrovia significantly from 14.2 deaths per 1000 births to 10.3 deaths per 1000 births."     "The new Sky Penetrator IV business jet’s cruising range has increased significantly from 3,975 miles to 4,000 miles."

Study Purpose: The purpose of this randomized controlled trial was to determine the impact of an app-based digital care program to treat chronic lower back pain compared to usual treatment. Post intervention pain scores were measured using Korff pain measurement scale that ranges from 0 (minimum) to 100 (maximum). The results for this study are summarized in the table below. Table: Mean Pain Reports Change in mean Change in mean Mean difference P- value pain score pain score (95% CI) Intervention group Control group (n=113) (n=64) Korff pain score -25.3 1.6 -26.9 (-33.8, -20) <0.001 Answer the following questions using data from the table above: 1. Is the result for the primary outcome (pain) statistically significant? Answer: YES or NO 2. Explain your answer